Navigation

  • Skip to Content
NTNU Home

ntnu.edu

  • Studies
    • Master's programmes in English
    • For exchange students
    • PhD opportunities
    • All programmes of study
    • Courses
    • Financing
    • Language requirements
    • Application process
    • Academic calendar
    • FAQ
  • Research and innovation
    • NTNU research
    • Research excellence
    • Strategic research areas
    • Innovation resources
    • PhD opportunities
  • Life and housing
    • Student in Trondheim
    • Student in Gjøvik
    • Student in Ålesund
    • For researchers
    • Life and housing
  • About NTNU
    • Contact us
    • Faculties and departments
    • Libraries
    • International researcher support
    • Vacancies
    • About NTNU
    • Maps
  1. Employees

Språkvelger

Norsk

Petter Nekså

Petter Nekså

Professor
Department of Energy and Process Engineering

petter.neksa@sintef.no
Varmeteknisk, Gløshaugen
About Publications Teaching Media

About

Refrigeration and heat pump technology in general · System design for refrigeration; air conditioning and heat pumps · CO2 technology for various applications · Low temperature refrigeration; liquefaction and gas processing (LNG; LH2; LCO2…) · Compressor and heat exchanger technology · Working fluids; with emphasis on natural working fluids · Power cycles for utilisation of low to medium temperature heat · Low temperature processes for CO2 capture; AGR and CCS · Energy systems and energy efficiency related issues in general;

Publications

  • Chronological
  • By category
  • See all publications in Cristin

2023

  • Voldsund, Mari; Reyes Lua, Adriana; Fu, Chao; Ditaranto, Mario; Nekså, Petter; Mazzetti, Marit Jagtoyen; Brekke, Olaf; Bindingsbø, Arne Ulrik; Grainger, David; Pettersen, Jostein. (2023) Low carbon power generation for offshore oil and gas production. Energy Conversion and Management: X. volum 17.
    Academic article

2022

  • Abdelaziz, Omar; Carvalho, Suely; Woodcock, Ashley; Agyarko, Kofi; Altoé, Paulo; Bhambure, Jitendra; Colbourne, Daniel; Dohnt, Hilde; Dreyfus, Gabrielle; Elassaad, Bassam; Gluckman, Ray; Hamed, Samir; Herlianika, Herlin; Kujak, Steven; Kumar, Saurabh; Li, Tingxun; Lord, Richard; Nekså, Petter; Okada, Tetsuji; Olama, Mohamed Alaa; Peixoto, Roberto; Shah, Nihar; Rajendran, Rajan; Rochat, Helene. (2022) Montreal protocol on substances that deplete the ozon layer: report of the Technology and Economic Assessment Panel. Volume 3: Decision XXXIII/5 - Continued provision of information on energy-efficient and low-global-warming-potential technologies. United Nations Environment Programme. 2022. ISBN 978-9966-076-95-3.
    Report
  • Berstad, David Olsson; Skaugen, Geir; Roussanaly, Simon; Anantharaman, Rahul; Nekså, Petter; Jordal, Aina Benedikte Kristin; Trædal, Stian; Gundersen, Truls. (2022) CO2 Capture from IGCC by Low-Temperature Synthesis Gas Separation. Energies. volum 15 (2).
    Academic article
  • Cely, Alexandra; Hammer, Morten; Andersen, Hilde; Yang, Tao; Nekså, Petter; Wilhelmsen, Øivind. (2022) Thermodynamic Model Evaluations for Hydrogen Pipeline Transportation. SPE EuropEC - Europe Energy Conference featured at the 83rd EAGE Annual Conference & Exhibition.
    Academic chapter/article/Conference paper
  • Ervik, Åsmund; Saai, Afaf; Berstad, Torodd; Meyer, Ole; Tsuji, Takuma; Oku, Tatsuya; Hattori, Kazuhiro; Yamada, Kazuya; Delhaye, Virgile Roger; Nekså, Petter. (2022) Coupled fluid-solid modelling of the valve dynamics in reciprocating compressors. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
    Academic chapter/article/Conference paper
  • Hagen, Brede Andre Larsen; Andresen, Trond; Nekså, Petter. (2022) Equation-oriented methods for optimizing Rankine cycles using radial inflow turbine. Energy. volum 252.
    Academic article
  • Nekså, Petter. (2022) Bør jeg kjøpe varmepumpe? Vil det lønne seg?.
    Website (informational material)
  • Nekså, Petter. (2022) Vis oss varmepumpa di, så skal vi si om du bruker den rett. Adresseavisen.
    Feature article
  • Perez Clos, Daniel; Zedel, Hannes; Johnsen, Sverre Gullikstad; Nekså, Petter; Aune, Ragnhild Elizabeth. (2022) Composition and Structure Analysis of Hard Grey Scale (HGS) Formed on Cold Surfaces Exposed to Aluminium Production Off-gas. JOM. volum 74 (9).
    Academic article
  • Røkke, Petter Egil; Kauko, Hanne; Nekså, Petter. (2022) Industrial neighbours can share excess energy.
    Website (informational material)
  • Shahrooz, Mina; Lundqvist, Per; Nekså, Petter. (2022) Performance of binary zeotropic mixtures in organic Rankine cycles (ORCs). Energy Conversion and Management. volum 266.
    Academic article
  • Yamaguchi, H.; Ishikawa, Yuki; Yamasaki, Hiroshi; Kamimura, Takeshi; Hattori, K; Nekså, Petter. (2022) Ultra-low temperature refrigeration system of CO2 using cyclone separator/evaporator. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
    Academic chapter/article/Conference paper
  • Yamasaki, Haruhiko; Wakimoto, Hiroyuki; Kamimura, Takeshi; Hattori, Kazuhiro; Nekså, Petter; Yamaguchi, Hiroshi. (2022) Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-Sublimator. Energies. volum 15 (11).
    Academic article

2021

  • Abdelaziz, Omar; Elassaad, Bassam; Bhambure, Jitendra; Kuijpers, Lambert J.M.; Nekså, Petter; Pachai, Alexander C.; Peixoto, Roberto; Polonara, Fabio; Rajendran, N.. (2021) Montreal Protocol on Substances that Deplete the Ozone Layer : Report of the Refrigeration Technical Options Committee Vaccines Cold Chain Subcommittee Addendum to the TEAP 2021 Progress Report. United Nations Environment Programme. 2021. ISBN 978-9966-076-90-8.
    Report
  • Berstad, David Olsson; Gardarsdottir, Stefania Osk; Roussanaly, Simon; Voldsund, Mari; Ishimoto, Yuki; Nekså, Petter. (2021) Liquid hydrogen as prospective energy carrier: A brief review and discussion of underlying assumptions applied in value chain analysis. Renewable & Sustainable Energy Reviews. volum 154.
    Academic article
  • Clos, Daniel Perez; Zedel, Hannes; Johnsen, Sverre Gullikstad; Nekså, Petter; Aune, Ragnhild Elizabeth. (2021) Particle deposition characteristics in the formation of Hard Grey Scale (HGS) on cold surfaces exposed to aluminium production off-gas. Journal of Aerosol Science. volum 161.
    Academic article
  • Ervik, Åsmund; Saai, Afaf; Berstad, Torodd; Meyer, Ole; Tsuji, Takuma; Oku, Tatsuya; Hattori, Kazuhiro; Yamada, Kazuya; Delhaye, Virgile Roger; Nekså, Petter. (2021) Modelling the dynamics of ring plate valves in reciprocating compressors using coupled CFD-FEM simulations. 10th IIR Conference on Compressors and Refrigerants.
    Academic chapter/article/Conference paper
  • Gardarsdottir, Stefania Osk; Nekså, Petter. (2021) Assumptions Matter When Assessing Blue & Green Hydrogen.
    Website (informational material)
  • Hagen, Brede; Agromayor, Roberto; Nekså, Petter. (2021) Equation-oriented methods for design optimization and performance analysis of radial inflow turbines. Energy. volum 237.
    Academic article
  • Røkke, Petter Egil; Kauko, Hanne; Nekså, Petter. (2021) Industrinaboer kan dele overskuddsenergi.
    Website (informational material)
  • Røkke, Petter Egil; Nekså, Petter. (2021) Episode 393 – Om varmetap med Petter Røkke og Petter Nekså. Teknisk ukeblad. 2021.
    Sound material
  • Singh, Simarpreet; Hafner, Armin; Maiya, M.P.; Banasiak, Krzysztof; Nekså, Petter. (2021) Multiejector CO2 cooling system with evaporative gascooler for a supermarket application in tropical regions. Applied Thermal Engineering. volum 190.
    Academic article

2020

  • Andresen, Trond; Lingaas, Simon Johan Nilsen; Hagen, Brede; Nekså, Petter. (2020) Dynamic Analysis of Energy Recovery Utilizing Thermal Storage from Batch-Wise Metal Casting. IIR Rankine Conference 2020.
    Academic chapter/article/Conference paper
  • Clos, Daniel Perez; Johnsen, Sverre Gullikstad; Nekså, Petter; Aune, Ragnhild Elizabeth. (2020) The Effect of Hard Scale Deposition on the Wall Heat Flux of a Cold Finger. Light Metals 2020.
    Academic chapter/article/Conference paper
  • Dasi, Koti; Singh, Simarpreet; Guruchethan, A.M.; Maiya, M.P.; Hafner, Armin; Banasiak, Krzysztof; Nekså, Petter. (2020) Performance Evaluation of Ejector Based CO₂ System for Simultaneous Heating and Cooling Application in an Indian Dairy Industry. Thermal Science and Engineering Progress. volum 20.
    Academic article
  • Hagen, Brede; Cavo, Matteo; Andresen, Trond; Nekså, Petter. (2020) Gradient Based Design Optimization of a Radial Inflow Turbine. IIR Rankine Conference 2020.
    Academic chapter/article/Conference paper
  • Ishimoto, Yuki; Voldsund, Mari; Nekså, Petter; Roussanaly, Simon; Berstad, David Olsson; Gardarsdottir, Stefania Osk. (2020) Large-scale production and transport of hydrogen from Norway to Europe and Japan: Value chain analysis and comparison of liquid hydrogen and ammonia as energy carriers. International Journal of Hydrogen Energy. volum 45 (58).
    Academic article
  • Nekså, Petter. (2020) How CO2 Can Help The Climate. SINTEF Energi AS. 2020.
    Multimedia product
  • Nekså, Petter. (2020) Hydrogen can contribute to decarbonizing the European energy system. SINTEF Energi. 2020.
    Multimedia product
  • Nekså, Petter. (2020) Norsk teknologi kan kutte 0,5 grader global oppvarming!. SINTEF Energi. 2020.
    Multimedia product
  • Shahrooz, Mina; Lundqvist, Per; Nekså, Petter. (2020) Effect of Waste Heat Utilization on the Performance of Low Temperature Rankine Cycle. IIR Rankine Conference 2020.
    Academic chapter/article/Conference paper
  • Singh, Simarpreet; Maiya, Prakash; Hafner, Armin; Banasiak, Krzysztof; Nekså, Petter. (2020) Energy efficient multiejector CO2 cooling system for high ambient temperature. Thermal Science and Engineering Progress. volum 19.
    Academic article
  • Skjervold, Vidar T.; Skaugen, Geir; Andresen, Trond; Nekså, Petter. (2020) Enabling Power Production from Challenging Industrial Off-Gas – Model-Based Investigation of a Novel Heat Recovery Concept. IIR Rankine Conference 2020.
    Academic chapter/article/Conference paper
  • Tazawa, Taluya; Yoshida, S; Yamasaki, Haruhiko; Wakimoto, Hiroyuki; Yamaguchi, Hiroshi; Kamimura, Takeshi; Hattori, Kazuhiro; Nekså, Petter. (2020) Thermal Characteristics in Supercritical CO2 Along Heating Tube. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
    Academic chapter/article/Conference paper
  • Wakimoto, Hiroko; Uchi, K.; Yamasaki, Haruhiko; Yamaguchi, Hiroshi; Kamimura, Takeshi; Hattori, Kazuyuki; Nekså, Petter. (2020) Basic performance of CO2 cyclone refrigeration system. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
    Academic chapter/article/Conference paper
  • Wakimoto, Hiroyuki; Kamimura, Takeshi; Hattori, Kazuhiro; Nekså, Petter; Yamaguchi, Hiroshi. (2020) Dry-ice collection performance and collection mechanism of cyclone separator-evaporator. 33rd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2020).
    Academic article
  • Yamasaki, Haruhiko; Kizilkan, Ônder; Yamaguchi, Hiroshi; Kamimura, Takeshi; Hattori, Kazuhiro; Nekså, Petter. (2020) Experimental investigation of dry ice cyclone separator for ultra‐low temperature energy storage using carbon dioxide. Energy Storage. volum 2 (4).
    Academic article
  • Yamasaki, Haruhiko; Wakimoto, Hiroyuki; Yamaguchi, Hiroshi; Nekså, Petter. (2020) Solar heat recovery system using CO2 as working fluid. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
    Academic chapter/article/Conference paper
  • Yamasaki, Haruhiko; Yamaguchi, Hiroshi; Kizilkan, Ônder; Kamimura, Takeshi; Hattori, Kazuhiro; Nekså, Petter. (2020) Experimental investigation of the effect of solid-gas two-phase flow in CO2 cascade refrigeration system. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects.
    Academic article

2019

  • Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael; Schlemminger, Christian. (2019) Experimental investigation of a prototype R-600 compressor for high temperature heat pump. Energy. volum 169.
    Academic article
  • Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael; Schlemminger, Christian. (2019) The development of a hydrocarbon high temperature heat pump for waste heat recovery. Energy. volum 173.
    Academic article
  • Banasiak, Krzysztof; Singh, Simarpreet; Hafner, Armin; Maiya, Prakash; Nekså, Petter; Pardiñas, Ángel Á.. (2019) Experimental investigation of CO2 systems for Indian supermarkets with parallel configuration of multiejectors (INDEE). Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
    Academic chapter/article/Conference paper
  • Clos, Daniel Perez; Nekså, Petter; Johnsen, Sverre Gullikstad; Aune, Ragnhild Elizabeth. (2019) Investigation on scale formation in aluminium industry by means of a cold-finger. The Minerals, Metals & Materials Series.
    Academic article
  • Jin, Zhequan; Hafner, Armin; Eikevik, Trygve Magne; Nekså, Petter. (2019) Preliminary study on CO2 transcritical ejector enhanced compressor refrigeration system for independent space cooling and dehumidification. International journal of refrigeration. volum 100.
    Academic article
  • Kumar, Kundan; Singh, Simarpreet; Kumar, Pramod; Maiya, M.P.; Hafner, Armin; Banasiak, Krzysztof; Nekså, Petter. (2019) Experimental analysis of transcritical CO2 booster refrigeration system with heat recovery and ejector expansion. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
    Academic chapter/article/Conference paper
  • Nekså, Petter; Bantle, Michael; Schlemminger, Christian; Bamigbetan, Opeyemi Olayinka. (2019) High temperature industrial heat pumps utilising natural working fluids. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
    Academic chapter/article/Conference paper
  • Nekså, Petter; Røkke, Petter Egil. (2019) Energibruk og utslipp i industrien: Den billigste kilowatttimen. Det Nye Digitale Norge.
    publications.POPVIT_KAPITTEL
  • Schlemminger, Christian; Svendsen, Eirik Starheim; Foslie, Sverre Stefanussen; Bantle, Michael; Bamigbetan, Opeyemi Olayinka; Nekså, Petter. (2019) Performance of high temperature heat pump for simultaneous and efficient production of ice water and process heat. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
    Academic chapter/article/Conference paper
  • Sharooz, Mina; Lindqvist, Per; Nekså, Petter. (2019) Effect of Working Fluid Type on Low Temperature Rankine Cycle Optimization. Proceedings of the 5th International Seminar on ORC Power Systems.
    Academic chapter/article/Conference paper
  • Singh, Simarpreet; Hafner, Armin; Banasiak, Krzysztof; Maiya, Prakash; Nekså, Petter. (2019) Experimental Evaluation of a Multi-Ejector Trans-critical CO2 System for Supermarkets. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
    Academic chapter/article/Conference paper
  • Tomasgard, Asgeir; Berstad, David Olsson; Blekkan, Edd Anders; Karstad, Per Ivar; Burheim, Odne Stokke; Dawson, James; Espegren, Kari Aamodt; Løvås, Terese; Meyer, Julien; Møller-Holst, Steffen; Nekså, Petter; Pollet, Bruno; Størset, Sigmund Østtveit; Sundseth, Kyrre; Thomassen, Magnus; Ulleberg, Øystein. (2019) Hydrogen i fremtidens lavkarbonsamfunn. 2019. ISBN 978-82-93198-31-4.
    Report

2018

  • Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael; Schlemminger, Christian. (2018) Experimental investigation of the performance of a hydrocarbon heat pump for high temperature industrial heating. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
    Academic chapter/article/Conference paper
  • Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael; Schlemminger, Christian. (2018) Theoretical analysis for charge reduction in a 200 kW hydrocarbon hight temperature heat pump. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
    Academic chapter/article/Conference paper
  • Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael; Schlemminger, Christian. (2018) Theoretical analysis of suitable fluids for high temperature heat pumps up to 125 °C heat delivery. International journal of refrigeration. volum 92.
    Academic article
  • Berstad, David Olsson; Nekså, Petter. (2018) Ambisiøse planer for hydrogen i Japan.
    Website (informational material)
  • Blust, Stefanie; Hafner, Armin; Banasiak, Krzysztof; Nekså, Petter. (2018) Possible configurations of multiejector driven CO2 systems for Indian supermarkets. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
    Academic chapter/article/Conference paper
  • Blust, Stefanie; Singh, Simarpreet; Banasiak, Krzysztof; Nekså, Petter. (2018) Environment-friendly refrigeration packs for Indian supermarkets: experimental investigation of energy performance of a multiejector-driven R744 integrated compressor rack. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
    Academic chapter/article/Conference paper
  • Dieryckx, Martin; Chen, Guangming; Gluckman, Ray; Nekså, Petter; Okada, Tetsuji. (2018) Water and space heating heat pumps. Montreal Protocol on Substances that Deplete the Ozone Layer : 2018 report of the Refrigeration, Air Conditioning and Heat Pumps Technical Options Committee.
    Chapter
  • Dorman, Dennis; Calm, James M.; Dieryckx, Martin; Hamed, Samir; Pachai, Alex; Rusignuolo, Gorgio; Nekså, Petter; Hickman, Kenneth E.. (2018) Chillers. Montreal Protocol on Substances that Deplete the Ozone Layer : 2018 report of the Refrigeration, Air Conditioning and Heat Pumps Technical Options Committee.
    Chapter
  • Ervik, Åsmund; Saai, Afaf; Meyer, Ole; Nekså, Petter. (2018) Modelling of mechanical and flow processes in compressors. 2018.
    Report
  • Hafner, Armin; Nekså, Petter. (2018) Integrated CO2 solutions for supermarkets. Science et technique du froid. volum 2018-June.
    Academic article
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep1: Utnytte industriell overskuddsvarme. SINTEF Energi, Facebook. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep1: Utnytte industriell overskuddsvarme. SINTEF Energi. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep2: Hvor bruker man arbeidsmedier?. SINTEF Energi. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep2: Hvor bruker man arbeidsmedier?. SINTEF Energi. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep3: Er kunstige arbeidsmedier egentlig så farlige?. SINTEF Energi, Facebook. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep3: Er kunstige arbeidsmedier egentlig så farlige?. SINTEF Energi. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep4: CO2 som arbeidsmedium. SINTEF Energi, Facebook. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep4: CO2 som kuldemedium. SINTEF Energi. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep5: Arbeidsmedier og overskuddsvarme. SINTEF Energi. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep5: Konvertering av overskuddsvarme. SINTEF Energi, Facebook. 2018.
    Multimedia product
  • Nekså, Petter; Berstad, David Olsson; Størset, Sigmund Østtveit. (2018) Fossil lhjelp til grønt skifte. Dagens næringsliv.
    Feature article
  • Rajendran, Rajan; Janssen, Martien; Kauffeld, Michael; Lal, D. Mohan; Nekså, Petter; Pedersen, Per-Henrik; Motta, Samuel Yana. (2018) Commercial refrigeration. Montreal Protocol on Substances that Deplete the Ozone Layer : 2018 report of the Refrigeration, Air Conditioning and Heat Pumps Technical Options Committee.
    Chapter
  • Shahrooz, Mina; Lundqvist, Per; Nekså, Petter. (2018) Natural refrigerants for low temperature power cycles. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
    Academic chapter/article/Conference paper
  • Singh, Simarpreet; Banasiak, Krzysztof; Hafner, Armin; Maiya, M.P.; Nekså, Petter. (2018) Performance evaluation of CO2 ejector system with parallel compressor for supermarket application. 17th International Refrigeration and Air Conditioning Conference 2018.
    Academic chapter/article/Conference paper
  • Singh, Simarpreet; Hafner, Armin; Banasiak, Krzysztof; Maiya, Prakash M.; Nekså, Petter. (2018) Experimental evaluation of multi-ejector based CO2 cooling system for supermarkets in tropical zones. 17th International Refrigeration and Air Conditioning Conference 2018.
    Academic chapter/article/Conference paper
  • Singh, Simarpreet; Maiya, M.P.; Hafner, Armin; Banasiak, Krzysztof; Nekså, Petter. (2018) CO2 refrigeration system for high ambient temperatures. Air Conditioning and Refrigeration Journal. volum 21 (5).
    Article
  • Singh, Simarpreet; Reddy, Amshith; Parkash, Maiya M.; Banasiak, Krzysztof; Hafner, Armin; Nekså, Petter. (2018) Analysis of R744 refrigeration system with liquid ejectors. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
    Academic chapter/article/Conference paper
  • Singh, Simarpreet; Reddy, Amshith; Prakash, Maiya P.; Banasiak, Krzysztof; Hafner, Armin; Nekså, Petter. (2018) Performance investigation of a multi-ejector R744 heat pump. Science et technique du froid. volum 2018-June.
    Academic article
  • Wilhelmsen, Øivind; Berstad, David Olsson; Aasen, Ailo; Nekså, Petter; Skaugen, Geir. (2018) Reducing the exergy destruction in the cryogenic heat exchangers of hydrogen liquefaction processes. International Journal of Hydrogen Energy. volum 43 (10).
    Academic article

2017

  • Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael. (2017) Extending ammonia high temperature heat pump using butane in a cascade system. 7th Conference on Ammonia and CO2 Refrigeration Technology, Ohrid, Macedonia, May 11-13, 2017.
    Academic chapter/article/Conference paper
  • Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael. (2017) Review of Vapour Compression Heat Pumps for High Temperature Heating using Natural Working Fluids. International journal of refrigeration. volum 80.
    Academic literature review
  • Berstad, David Olsson; Wilhelmsen, Øivind; Skjervold, Vidar T.; Nekså, Petter. (2017) Cryogenic CO2 condensation and membrane separation of syngas for large-scale LH2 production. Cryogenics 2017 : Proceedings of the 14th IIR International Conference, Dresden, Germany, Mai 15-19, 2017..
    Academic chapter/article/Conference paper
  • Clos, Daniel Perez; Andresen, Trond; Nekså, Petter; Johnsen, Sverre Gullikstad; Aune, Ragnhild Elizabeth. (2017) Enabling Efficient Heat Recovery from Aluminium Pot Gas. Light metals 2017.
    Academic chapter/article/Conference paper
  • Jin, Zhequan; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin. (2017) A steady and quasi-steady state analysis on the CO2 hybrid ground-coupled heat pumping system. International journal of refrigeration. volum 76.
    Academic article
  • Jin, Zhequan; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin; Wang, Ruzhu. (2017) Annual energy performance of R744 and R410A heat pumping systems. Applied Thermal Engineering. volum 117.
    Academic article
  • Kauko, Hanne; Nordtvedt, Stein Rune; Nekså, Petter; Bantle, Michael. (2017) High-temperature heat pumps based on natural working fluids to produce district heating from industrial waste heat. 7th Conference on Ammonia and CO2 Refrigeration Technology, Ohrid, Macedonia, May 11-13, 2017.
    Academic chapter/article/Conference paper
  • Nekså, Petter. (2017) FN-møte i Jordan for å fase ut klimagasser.
    Website (informational material)
  • Wilhelmsen, Øivind; Skaugen, Geir; Berstad, David Olsson; Aasen, Ailo; Nekså, Petter. (2017) Understanding the physical phenomena that occur inside heat exchangers for liquefaction of hydrogen. Cryogenics 2017 : Proceedings of the 14th IIR International Conference, Dresden, Germany, Mai 15-19, 2017..
    Academic chapter/article/Conference paper
  • Yamasaki, Haruhiko; Yamaguchi, Hiroshi; Hattori, Kazuyuki; Nekså, Petter. (2017) Experimental Observation of CO2 Dry-ice Behavior in an Evaporator/Sublimator. Energy Procedia. volum 143.
    Academic article

2016

  • Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael. (2016) Evaluation of Natural working fluids for the Development of high temperature heat pumps. 12th IIR Gustav Lorentzen Conference on Natural Refrigerants GL2016 : Proceedings.
    Academic chapter/article/Conference paper
  • Haukås, Hans T.; Stene, Jørn; Rekstad, Inge Håvard; Nekså, Petter; Hafner, Armin; Eikevik, Trygve Magne. (2016) CO2 (R744) som kuldemedium. 2016.
    Compendium
  • Hemmingsen, Anne Karin; Nekså, Petter. (2016) Spillvarme inn i varmen. Gemini.
    Feature article
  • Hemmingsen, Anne Karin; Nekså, Petter. (2016) Spillvarme inn i varmen. Dagens næringsliv.
    Feature article
  • Hu, Haitao; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin; Ding, Guoliang; Huang, Qingnan; Ye, Jingjing. (2016) Performance analysis of an R744 ground source heat pump system with air-cooled and water-cooled gas coolers. International journal of refrigeration. volum 63.
    Academic article
  • Jin, Zhequan; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin. (2016) Investigation on CO2 hybrid ground-coupled heat pumping system under warm climate. International journal of refrigeration. volum 62.
    Academic article
  • Jin, Zhequan; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin; Wang, Ruzhu. (2016) Energy efficiency comparison of heat pumping systems using R744 and R410A as refrigerant. 12th IIR Gustav Lorentzen Conference on Natural Refrigerants GL2016 : Proceedings.
    Academic chapter/article/Conference paper
  • Nekså, Petter. (2016) What is the role for gas in the future?.
    Website (informational material)
  • Nekså, Petter; Hafner, Armin; Bredesen, Arne Mathias; Eikevik, Trygve Magne. (2016) CO2 as working fluid - technological development on the road to sustainable refrigeration. 12th IIR Gustav Lorentzen Conference on Natural Refrigerants GL2016 : Proceedings.
    Academic chapter/article/Conference paper
  • Nekså, Petter; Hemmingsen, Anne Karin Torstveit. (2016) CO2 gir grønn kjøling. Dagens næringsliv.
    Feature article

2015

  • Berstad, David Olsson; Nekså, Petter. (2015) Flytende vind og gass til Japan?. Dagens næringsliv.
    Feature article
  • Clodic, Denis; Janssen, Martien; Kauffeld, Michael; Nekså, Petter; Pedersen, Per-Henrik; Silva, Alessandro; Rajandran, Rajan. (2015) Commercial refrigeration. Montreal protocol on substances that deplete the ozone layer : UNEP 2014 Report on the refrigeration, air conditioning and heat pumps Technical Options Committee : 2014 assessment.
    Academic chapter/article/Conference paper
  • Dieryckx, Martin; Chen, Guangming; Grozdek, Marino; Kaibara, Makoto; Nekså, Petter; Okada, Tetsuji. (2015) Water heating heat pumps. Montreal protocol on substances that deplete the ozone layer : UNEP 2014 Report on the refrigeration, air conditioning and heat pumps Technical Options Committee : 2014 assessment.
    Academic chapter/article/Conference paper
  • DiRenzo, Joseph; Nekså, Petter; Kolsaker, Kjell. (2015) Analysis of Natural Gas engine de-loading on LNG fuelled vessels. Energy Procedia. volum 64 (C).
    Academic article
  • Fidorra, N; Hafner, Armin; Nekså, Petter; Köhler, Jürgen. (2015) Energy cost analysis of heat recovery in CO2 supermarket refrigeration systems. Ammonia and CO2 Refrigeration Technologies - Ohrid, Macedonia April 16-18, 2015 - Proceedings.
    Academic chapter/article/Conference paper
  • Hafner, Armin; Nekså, Petter. (2015) Il futoro del CO2 : confronto di diverse configurazioni di un sistema ad R744 per supermercati nei paesi piu caldi. Industria & formazione.
    Article
  • Hafner, Armin; Nekså, Petter. (2015) System configurations for supermarkets in warm climates applying R744 refrigeration technologies - case studies of selected cities. 16th European Conference - Latest technologies in refrigeration and air conditioning, Milano 12th-13th June 2015 - Expo 2015.
    Chapter
  • Iwamoto, Yuhiro; Yamasaki, Haruhiko; Niu, Xiao-Dong; Nekså, Petter; Yamaguchi, Hiroshi. (2015) Experimental study on system performance of ultra-low temperature cascade refrigeration system using Carbon Dioxide with tapered evaporator/sublimator. Proceedings of the 24th International Congress of Refrigeration.
    Academic chapter/article/Conference paper
  • Jin, Zhequan; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin; Ding, Guoliang. (2015) ENERGY PERFORMANCE OF CO2 HYBRID GROUND-COUPLED HEAT PUMPING SYSTEM FOR HOTEL APPLICATION. Proceedings of the 24th International Congress of Refrigeration.
    Academic chapter/article/Conference paper
  • Jordal, Kristin; Anantharaman, Rahul; Peters, Thijs; Berstad, David Olsson; Morud, John Christian; Nekså, Petter; Bredesen, Rune. (2015) High-purity H2 production with CO2 capture based on coal gasification. Energy. volum 88.
    Academic article
  • Jordal, Kristin; Berstad, David Olsson; Nekså, Petter. (2015) Hydrogen cars: The role of fossil fuels and CCS in a cleaner transport system.
    Website (informational material)
  • Jordal, Kristin; Berstad, David Olsson; Nekså, Petter. (2015) The role of fossil fuels and CCS in a cleaner transport system.
    Website (informational material)
  • Nekså, Petter. (2015) Energisk mellom Japan og Norge.
    Briefs
  • Nekså, Petter. (2015) Preface. Energy Procedia. volum 64 (C).
    Editorial
  • Nekså, Petter; Dieryckx, Martin; Chen, Guangming; Grozdek, Marino; kaibara, Makoto; Okada, Tetsuji. (2015) Water Heating Heat Pumps. 2014 REPORT OF THE REFRIGERATION, AIR CONDITIONING AND HEAT PUMPS TECHNICAL OPTIONS COMMITTEE.
    Chapter
  • Nekså, Petter; Janssen, Martien; Kauffeld, Michael; Pedersen, Per-Henrik; Silva, Alessandro; Rajandran, Rajan. (2015) Commercial Refrigeration. 2014 REPORT OF THE REFRIGERATION, AIR CONDITIONING AND HEAT PUMPS TECHNICAL OPTIONS COMMITTEE.
    Chapter

2014

  • Berstad, David Olsson; Roussanaly, Simon; Skaugen, Geir; Anantharaman, Rahul; Nekså, Petter; Jordal, Kristin. (2014) Energy and Cost Evaluation of A Low-temperature CO2 Capture Unit for IGCC plants. Energy Procedia. volum 63.
    Academic article
  • Hafner, Armin; Hemmingsen, Anne Karin; Nekså, Petter. (2014) System configuration for supermarkets in warm climates applying R744 refrigeration technologies - case study of selected chinese cities. Proceedings of the 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014.
    Academic chapter/article/Conference paper
  • Hafner, Armin; Nekså, Petter. (2014) System configurations for supermarkets i warm climates applying R744 refrigeration technologies - case study of selected cities. Industria & formazione.
    Popular scientific article
  • Jin, Zhequan; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin; Ding, G.; Hu, Haitao. (2014) Transient simulation of R744 hybrid ground coupled heat pump with modelica. Proceedings of the 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014.
    Academic chapter/article/Conference paper
  • Mazzetti, Marit Jagtoyen; Ladam, Yves; Walnum, Harald Taxt; Hagen, Brede Andre Larsen; Skaugen, Geir; Nekså, Petter. (2014) Flexible Combined Heat and Power Systems for Offshore Oil and Gas Facilities With CO2 Bottoming Cycles. ASME 2014 Power Conference - POWER 2014 - Volume 2.
    Academic chapter/article/Conference paper
  • Mazzetti, Marit Jagtoyen; Nekså, Petter; Walnum, Harald Taxt; Hemmingsen, Anne Karin. (2014) Energy-Efficient Technologies for Reduction of Offshore CO2 Emissions. Oil and Gas Facilities. volum 3 (1).
    Academic literature review
  • Nekså, Petter. (2014) Carbon dioxide applications. CO2 as a refrigerant.
    Academic chapter/article/Conference paper
  • Skaugen, Geir; Walnum, Harald Taxt; Hagen, Brede Andre Larsen; Clos, Daniel Perez; Mazzetti, Marit Jagtoyen; Nekså, Petter. (2014) Design and optimization of waste heat recovery unit using carbon dioxide as cooling fluid. ASME 2014 Power Conference - POWER 2014 - volume 1.
    Academic chapter/article/Conference paper
  • Yamaguchi, H.; Iwamoto, Y; Ozaki, S; Nekså, Petter. (2014) Experimental observation of sedimentation phenomena of CO2 dry ice in model channel. Proceedings of the 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014.
    Academic chapter/article/Conference paper
  • Ye, Jingjing; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin; Ding, G.; Hu, H.. (2014) Performance and economy analysis of a solar assisted CO2 ground source heat pump with air-cooled gas cooler under different climate conditions. Proceedings of the 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014.
    Academic chapter/article/Conference paper

2013

  • Berstad, David Olsson; Anantharaman, Rahul; Nekså, Petter. (2013) Integrated Low-temperature CO2 Capture from IGCC Power Plant by Partial Condensation and Separation of Syngas. Chemical Engineering Transactions.
    Academic article
  • Berstad, David Olsson; Anantharaman, Rahul; Nekså, Petter. (2013) Low-temperature CCS from an IGCC Power Plant and Comparison with Physical Solvents. Energy Procedia. volum 37.
    Academic article
  • Berstad, David Olsson; Anantharaman, Rahul; Nekså, Petter. (2013) Low-temperature CO2 capture technologies - Applications and potential. International journal of refrigeration. volum 36 (5).
    Academic literature review
  • Hafner, Armin; Justo Alonso, Maria; Schmälzle, Christian; Nekså, Petter. (2013) High efficient 18-90 m3/h R744 compressor. Compressors 2013 : 8th International Conference on Compressors and Coolants.
    Academic chapter/article/Conference paper
  • Kus, Bartosz; Nekså, Petter. (2013) Development of one-dimensional model for initial design and evaluation of oil-free CO2 turbo-compressor. International journal of refrigeration. volum 36 (8).
    Academic article
  • Kus, Bartosz; Nekså, Petter. (2013) Novel partial admission radial compressor for CO2 applications. International journal of refrigeration. volum 36 (8).
    Academic article
  • Kus, Bartosz; Nekså, Petter. (2013) Oil free turbo-compressors for CO2 refrigeration applications. International journal of refrigeration. volum 36 (5).
    Academic article
  • Mazzetti, Marit Jagtoyen; Nekså, Petter; Walnum, Harald Taxt; Hemmingsen, Anne Karin. (2013) Novel energy efficiency technologies for reduction of offshore CO2 emissions. Offshore Technology Conference.
    Academic chapter/article/Conference paper
  • Rohde, Daniel; Walnum, Harald Taxt; Andresen, Trond; Nekså, Petter. (2013) Heat recovery from export gas compression: Analyzing power cycles with detailed heat exchanger models. Applied Thermal Engineering. volum 60 (1-2).
    Academic article
  • Walnum, Harald Taxt; Nekså, Petter; Nord, Lars Olof; Andresen, Trond. (2013) Modelling and simulation of CO2 (carbon dioxide) bottoming cycles for offshore oil and gas installations at design and off-design conditions. Energy. volum 59.
    Academic article

2012

  • Berstad, David Olsson; Nekså, Petter; Anantharaman, Rahul. (2012) Low-temperature CO2 Removal from Natural Gas. Energy Procedia. volum 26.
    Academic article
  • Hafner, Armin; Poppi, Stefano; Nekså, Petter; Minetto, Silvia; Eikevik, Trygve Magne. (2012) Development of Commersial Refrigeration Systems with Heat Recovery for Supermaket Buildings. Proceedings of 10th IIR Gustav Lorentzen Conference, June 25 - 27 2012 Delft, the Netherlands.
    Academic chapter/article/Conference paper
  • Hafner, Armin; Schmälzle, Christian; Nekså, Petter; Obrist, Frank; Rekstad, Inge Håvard. (2012) High efficient 100 kW elR744 compressor. Proceedings of 10th IIR Gustav Lorentzen Conference, June 25 - 27 2012 Delft, the Netherlands.
    Academic chapter/article/Conference paper
  • Kus, Bartosz; Nekså, Petter. (2012) Oil Free Turbo-Compressors For Refrigeration Applications. Proceedings of 10th IIR Gustav Lorentzen Conference, June 25 - 27 2012 Delft, the Netherlands.
    Academic chapter/article/Conference paper
  • Mazzetti, Marit Jagtoyen; Nekså, Petter. (2012) Tapt kraft til Nytte. Dagens næringsliv. volum 123 (281).
    Feature article
  • Quack, Hans; Essler, Jürgen; Haberstroh, Christoph; Walnum, Harald Taxt; Berstad, David Olsson; Drescher, Michael; Nekså, Petter. (2012) Search for the Best Processes to Liquefy Hydrogen in Very Large Plants. Proceedings : the 12th Cryogenics 2012 IIR International Conference, Dresden, Germany, September 11-14, 2012.
    Academic chapter/article/Conference paper
  • Rohde, Daniel; Ladam, Yves; Walnum, Harald Taxt; Nekså, Petter. (2012) Heat pumps for steam production from waste heat. Proceedings of 10th IIR Gustav Lorentzen Conference, June 25 - 27 2012 Delft, the Netherlands.
    Academic chapter/article/Conference paper
  • Titze, Maren; Lemke, Nicholas; Nekså, Petter; Hafner, Armin; Köhler, Jürgen. (2012) Dynamic modeling of a combined supermarket refrigeration and HVAC system. Proceedings of 10th IIR Gustav Lorentzen Conference, June 25 - 27 2012 Delft, the Netherlands.
    Academic chapter/article/Conference paper
  • Walnum, Harald Taxt; Berstad, David Olsson; Drescher, Michael; Nekså, Petter; Quack, Hans; Haberstroh, Christoph; Essler, Jürgen. (2012) Principles for the Liquefaction of Hydrogen with Emphasis on Precooling Processes. Proceedings : the 12th Cryogenics 2012 IIR International Conference, Dresden, Germany, September 11-14, 2012.
    Academic chapter/article/Conference paper

2011

  • Berstad, David Olsson; Anantharaman, Rahul; Nekså, Petter. (2011) Potential for low-temperature concepts in different CCS applications. Proceedings of the 23rd International Congress of Refrigeration.
    Academic chapter/article/Conference paper
  • Berstad, David Olsson; Nekså, Petter; Anantharaman, Rahul. (2011) Low-temperature syngas separation for CO2 capture from an IGCC power plant. Proceedings of the 23rd International Congress of Refrigeration.
    Academic chapter/article/Conference paper
  • Berstad, David Olsson; Nekså, Petter; Reigstad, Gunhild Allard. (2011) Low-temperature syngas separation and CO2 capture for enhanced efficiency of IGCC power plants. Energy Procedia. volum 4.
    Academic article
  • Hafner, Armin; Nekså, Petter; Ladam, Yves; Eikevik, Trygve Magne. (2011) OIL-FREE R744 SYSTEMS FOR INDUSTRIAL/COMMERCIAL APPLICATIONS. Proceedings of the 23rd International Congress of Refrigeration.
    Academic chapter/article/Conference paper
  • Hafner, Armin; Nekså, Petter; Ladam, Yves; Eikevik, Trygve Magne. (2011) Oljefrie CO2 systemer for industrielle og kommersielle anvendelser. Kulde.
    Academic article
  • Krasae-in, Songwut; Bredesen, Arne Mathias; Stang, Hans Georg Jacob; Nekså, Petter. (2011) Simulation and experiment of a hydrogen liquefaction test rig using a multi-component refrigerant refrigeration system. International Journal of Hydrogen Energy. volum 36 (1).
    Academic article
  • Nekså, Petter; Berstad, David Olsson; Anantharaman, Rahul. (2011) Overview of current and possible applications for refrigeration technologies within CCS. Proceedings of the 23rd International Congress of Refrigeration.
    Academic chapter/article/Conference paper
  • Nekså, Petter; Čermák, Radim; Kauffeld, Michael; Pachai, Alexander C.; Wild, Yves; Cavalier, Gerald; Xie, Ruhe; Colborne, Daniel. (2011) Transport Refrigeration. 2010 REPORT OF THE REFRIGERATION, AIR CONDITIONING AND HEAT PUMPS TECHNICAL OPTIONS COMMITTEE.
    Chapter
  • Nekså, Petter; Clodic, Denis; Kauffeld, Michael; Pedersen, Per-Henrik; Peixoto, Roberto. (2011) Commercial Refrigeration. 2010 REPORT OF THE REFRIGERATION, AIR CONDITIONING AND HEAT PUMPS TECHNICAL OPTIONS COMMITTEE.
    Chapter
  • Nekså, Petter; Hickman, Kenneth E.; Calm, James M.; Chen, Guangming; Crawford, Jim; Dorman, Dennis; Pachai, Alexander C.; Pearson, Andy; Colbourne, Daniel; Ohtsuki, Akira. (2011) Chillers. 2010 REPORT OF THE REFRIGERATION, AIR CONDITIONING AND HEAT PUMPS TECHNICAL OPTIONS COMMITTEE.
    Chapter
  • Nekså, Petter; kaibara, Makoto; Dieryckx, Martin; Keller, Fred J.; Calm, James M.; Colbourne, Daniel; Pachai, Alexander C.; Hickman, Kenneth E.; Nordman, Roger. (2011) Heat Pumps. 2010 REPORT OF THE REFRIGERATION, AIR CONDITIONING AND HEAT PUMPS TECHNICAL OPTIONS COMMITTEE.
    Chapter
  • Nekså, Petter; Keller, Fred J.; Colbourne, Daniel; Devotta, Sukumar; Agarwal, Radhey; Crawford, Jim; Dieryckx, Martin; kaibara, Makoto; McInerney, Ed; Nelson, Horace A.; Vodianitskaia, Paulo. (2011) Air-to-Air Air Conditioners and Heat Pumps. 2010 REPORT OF THE REFRIGERATION, AIR CONDITIONING AND HEAT PUMPS TECHNICAL OPTIONS COMMITTEE.
    Chapter
  • Niu, Xiao-Dong; Yamaguchi, Hiroshi; Iwamoto, Yuhiro; Nekså, Petter. (2011) Experimental study on a CO2-solid-gas-flow-based ultra-low temperature cascade refrigeration system. International Journal of Low-Carbon Technologies. volum 6 (2).
    Academic article
  • Tangen, Grethe; Hemmingsen, Anne Karin; Lorentsen, Odd-Arne; Nekså, Petter. (2011) Energy efficiency in industry - a main path for increased value creation and sustainable energy use. Proceedings of the 23rd International Congress of Refrigeration.
    Academic chapter/article/Conference paper
  • Tangen, Grethe; Hemmingsen, Anne Karin; Nekså, Petter. (2011) CREATIV: Research-based innovation for industry energy efficiency. Applied Thermal Engineering. volum 31 (17-18).
    Academic article
  • Walnum, Harald Taxt; Ladam, Yves; Nekså, Petter; Andresen, Trond. (2011) Off-design operation of ORC and CO2 power production cycles for low temperature surplus heat recovery. International Journal of Low-Carbon Technologies. volum 6 (2).
    Academic article
  • Yamaguchi, Hiroshi; Niu, Xiao-Dong; Sekimoto, Kenichi; Nekså, Petter. (2011) Investigation of dry ice blockage in an ultra-low temperature cascade refrigeration system using CO2 as a working fluid. International journal of refrigeration. volum 34 (2).
    Academic article

2010

  • Berstad, David Olsson; Stang, Jacob H; Nekså, Petter. (2010) Large-scale hydrogen liquefier utilising mixed-refrigerant pre-cooling. International Journal of Hydrogen Energy. volum 35 (10).
    Academic article
  • Hafner, Armin; Christensen, Øystein Torp; Nekså, Petter. (2010) Reversible R744 (CO2) heat pumps applied in public trains. 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids.
    Academic chapter/article/Conference paper
  • Hafner, Armin; Ladam, Yves; Andresen, Trond; Nekså, Petter. (2010) Experimental investigation of different ejector geometries for R-744 transcritical systems. 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids.
    Academic chapter/article/Conference paper
  • Krasae-in, Songwut; Stang, Jacob H; Nekså, Petter. (2010) Exergy analysis on the simulation of a small-scale hydrogen liquefaction test rig with a multi-component refrigerant refrigeration system. International Journal of Hydrogen Energy. volum 35 (15).
    Academic article
  • Krasae-in, Songwut; Stang, Jacob H; Nekså, Petter. (2010) Simulation on a proposed large-scale liquid hydrogen plant using a multi-component refrigerant refrigeration system. International Journal of Hydrogen Energy. volum 35 (22).
    Academic article
  • Skaugen, Geir; Reigstad, Gunhild Allard; Nekså, Petter; Wahl, Per Eilif. (2010) Use of sophisticated heat exchanger simulation models for investigation of possible design and operational pitfalls in LNG processes. Journal of Natural Gas Science and Engineering. volum 2 (5).
    Academic article

2009

  • Berstad, David Olsson; Stang, Jacob H; Nekså, Petter. (2009) Comparison criteria for large-scale hydrogen liquefaction processes. International Journal of Hydrogen Energy. volum 34 (3).
    Academic article

2008

  • Zha, Shitong; Hafner, Armin (SINTEF); Nekså, Petter (SINTEF). (2008) Investigation of R-744 Voorhees transcritical heat pump system. International journal of refrigeration. volum 31 (1).
    Academic article

2007

  • Eikevik, Trygve Magne; Nekså, Petter (SINTEF). (2007) Proceedings - 7th IIR Gustav Lorentzen Conference on Natural Working Fluids. 2007. ISBN 2-913149-48-0.
    Non-fiction book
  • Haukås, Hans Torleiv; Stene, Jørn; Rekstad, Inge Håvard; Nekså, Petter (SINTEF); Eikevik, Trygve Magne. (2007) Kjøle- og fryseanlegg med CO2 (R744) som kuldemedium. 2007. ISBN 000-00-000-0000-0.
    Textbook
  • Hafner, Armin; Nekså, Petter. (2007) Global environmental and economic benefits of introducing R-744 mobile air conditioning. Proceedings : 22nd International Congress of Refrigeration : Refrigeration creates the future.
    Academic chapter/article/Conference paper
  • Stene, Jørn; Andresen, Trond; Skiple, Torgeir; Nekså, Petter. (2007) CO2 Heat pump system for combined heating and cooling of non-residential buildings. Proceedings : 22nd International Congress of Refrigeration : Refrigeration creates the future.
    Academic chapter/article/Conference paper

2006

  • Aspelund, Audun; Reigstad, Gunhild Allard; Nekså, Petter; Kolsaker, Kjell. (2006) LNG-Chain, a calculation tool for natural gas quality in small-scale LNG distribution chains. Science et technique du froid.
    Academic article
  • Hafner, Armin; Nekså, Petter. (2006) Global environmental consequences of introducing R-744 (CO2) mobile air conditioning. 7th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2006).
    Academic chapter/article/Conference paper
  • Hafner, Armin; Nekså, Petter. (2006) Globale Konsequenzen bei der Einführung von Fahrzeugklimaanlagen mit dem Kältemittel R-744. Deutsche Kälte-Klima-Tagung 2006 Dresden.
    Academic chapter/article/Conference paper
  • Nekså, Petter. (2006) Performance of CO2-refrigeration (R-744) in commercial cold drink equipment. 7th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2006).
    Academic chapter/article/Conference paper

2005

  • Nekså, Petter; Hoggen, Rune Lillethun; Aflekt, Kåre; Jakobsen, Arne; Skaugen, Geir. (2005) Fan-less heat exchanger concept for CO2 heat pump systems. International journal of refrigeration. volum 28.
    Academic article
  • Nekså, Petter. (2005) Refrigeration sector. IPCC/TEAP special report on safeguarding the ozone layer and the global climate system : issues related to hydrofluorocarbons and perfluorocarbons.
    Academic chapter/article/Conference paper

2004

  • Nekså, Petter; Girotto, Sergio; Minetto, Silvia; Pettersen, Jostein. (2004) Commercial refrigeration system using CO2 as the refrigerant. International journal of refrigeration. volum 27 (7).
    Academic article
  • Jakobsen, Arne; Skaugen, Geir; Skiple, Torgeir; Nekså, Petter; Andresen, Trond. (2004) Development and Evaluation of a Reversible CO2 Residential Air Conditioning System Compared to State-of-the-Art R410A Unit. 6th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2004).
    Academic chapter/article/Conference paper

2002

  • Elgsæther, Munan; Nekså, Petter; Skaugen, Geir; Rekstad, Håvard. (2002) CO2 as refrigerant in beverage coolers, Evaluation and prototype testing. 2002. SINTEF Rapport (TRF5738).
    Report
  • Munkejord, Svend Tollak; Mæhlum, Harald S.; Zakeri, Gholam R.; Nekså, Petter; Pettersen, Jostein. (2002) Micro technology in heat pumping systems. International journal of refrigeration. volum 25.
    Academic article
  • Nekså, Petter; Pettersen, Jostein. (2002) Air Conditioning and Heat Pump Technology Development in Europe. The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea. volum 31 (7).
    Academic article
  • Pettersen, Jostein; Nekså, Petter. (2002) Financial Times' Global Energy Awards 2001 : NTNU/Sintef CO2-teknologi til finalen. Xergi. volum 42 (1).
    Popular scientific article
  • Pettersen, Jostein; Nekså, Petter; Rekstad, Håvard. (2002) Testing and evaluation of a condensing unit in a residential air conditioning system. 2002. SINTEF Rapport (TRF5686).
    Report
  • Rekstad, Håvard; Nekså, Petter. (2002) Testing and evaluation of CO2 compressors for the NBC project. Item 2. Compresosr tests at SINTEF. 2002. SINTEF Rapport (TRF5717).
    Report
  • Nekså, Petter. (2002) CO2 heat pump system. International journal of refrigeration. volum 25 (4).
    Academic article

2001

  • Aarlien, Rune; Pettersen, Jostein; Nekså, Petter; Strømmen, Ingvald; Eikevik, Trygve Magne; Bredesen, Arne Mathias. (2001) Place du CO2 dans les applications frigorifiques et de conditionnement d'air. La Revue Générale du Froid.
    Academic article

2000

  • Nekså, Petter; Bredesen, Arne Mathias. (2000) Short Course on CO2 Refrigeration Technology (SC7). 2000.
    Compendium
  • Strømmen, Ingvald; Bredesen, Arne Mathias; Eikevik, Trygve Magne; Nekså, P.; Pettersen, Jostein; Aarlien, R.. (2000) Refrigeration, Air-conditioning and Heat-Pump Systems for the 21st Century Pompes à chaleur, applicatins frigorifiques et de conditionnement d`air pour le 21e siècle. Bulletin of the International Institute of Refrigeration : Bulletin de l'Institut international du froid. volum LXXX (2).
    Academic article

1999

  • Rekstad, Håvard; Nekså, Petter; Bredesen, Arne Mathias. (1999) Measurements on semi-hermetic pre-series CO2 compressors. 1999. ISBN 82-594-1675-1.
    Report

1998

  • Nekså, Petter; Rekstad, Håvard; Zakeri, G. Reza; Schiefloe, Per Arne. (1998) CO%c-heat pump water heater : characteristics, system design and experimental results. International journal of refrigeration. volum 21 (3).
    Popular scientific article
  • Stene, Jørn; Nekså, Petter. (1998) Highly Efficient CO2 Heat Pump Water Heaters. Heat Pump Centre Newsletter. volum 16 (4).
    Popular scientific article

1996

  • Aarlien, Rune; Nekså, Petter; Pettersen, Jostein. (1996) CO2 som alternativt arbeidsmedium i air-conditioninganlegg og varmepumper for boligformål. Kulde.
    Popular scientific article
  • Aarlien, Rune; Nekså, Petter; Pettersen, Jostein. (1996) Sammenlignende beregninger mellom anlegg med CO2 og R-22. Kulde.
    Popular scientific article

1994

  • Haukås, Hans; Brendeng, Einar; Lorentzen, Gustav; Owren, Geir; Nekså, Petter; Aflekt, Kåre; Jørstad, Oddvar; Lystad, Tor; Nesje, Odd; Sandbakk, Marit. (1994) KFK-fri teknologi for kuldeanlegg og varmepumper : kompendiesamling nytt EEU-kurs. 1994.
    Compendium
  • Nekså, Petter. (1994) Erstatningsmedier for HKFK-22. 1994.
    Compendium

Journal publications

  • Voldsund, Mari; Reyes Lua, Adriana; Fu, Chao; Ditaranto, Mario; Nekså, Petter; Mazzetti, Marit Jagtoyen; Brekke, Olaf; Bindingsbø, Arne Ulrik; Grainger, David; Pettersen, Jostein. (2023) Low carbon power generation for offshore oil and gas production. Energy Conversion and Management: X. volum 17.
    Academic article
  • Berstad, David Olsson; Skaugen, Geir; Roussanaly, Simon; Anantharaman, Rahul; Nekså, Petter; Jordal, Aina Benedikte Kristin; Trædal, Stian; Gundersen, Truls. (2022) CO2 Capture from IGCC by Low-Temperature Synthesis Gas Separation. Energies. volum 15 (2).
    Academic article
  • Hagen, Brede Andre Larsen; Andresen, Trond; Nekså, Petter. (2022) Equation-oriented methods for optimizing Rankine cycles using radial inflow turbine. Energy. volum 252.
    Academic article
  • Nekså, Petter. (2022) Vis oss varmepumpa di, så skal vi si om du bruker den rett. Adresseavisen.
    Feature article
  • Perez Clos, Daniel; Zedel, Hannes; Johnsen, Sverre Gullikstad; Nekså, Petter; Aune, Ragnhild Elizabeth. (2022) Composition and Structure Analysis of Hard Grey Scale (HGS) Formed on Cold Surfaces Exposed to Aluminium Production Off-gas. JOM. volum 74 (9).
    Academic article
  • Shahrooz, Mina; Lundqvist, Per; Nekså, Petter. (2022) Performance of binary zeotropic mixtures in organic Rankine cycles (ORCs). Energy Conversion and Management. volum 266.
    Academic article
  • Yamasaki, Haruhiko; Wakimoto, Hiroyuki; Kamimura, Takeshi; Hattori, Kazuhiro; Nekså, Petter; Yamaguchi, Hiroshi. (2022) Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-Sublimator. Energies. volum 15 (11).
    Academic article
  • Berstad, David Olsson; Gardarsdottir, Stefania Osk; Roussanaly, Simon; Voldsund, Mari; Ishimoto, Yuki; Nekså, Petter. (2021) Liquid hydrogen as prospective energy carrier: A brief review and discussion of underlying assumptions applied in value chain analysis. Renewable & Sustainable Energy Reviews. volum 154.
    Academic article
  • Clos, Daniel Perez; Zedel, Hannes; Johnsen, Sverre Gullikstad; Nekså, Petter; Aune, Ragnhild Elizabeth. (2021) Particle deposition characteristics in the formation of Hard Grey Scale (HGS) on cold surfaces exposed to aluminium production off-gas. Journal of Aerosol Science. volum 161.
    Academic article
  • Hagen, Brede; Agromayor, Roberto; Nekså, Petter. (2021) Equation-oriented methods for design optimization and performance analysis of radial inflow turbines. Energy. volum 237.
    Academic article
  • Singh, Simarpreet; Hafner, Armin; Maiya, M.P.; Banasiak, Krzysztof; Nekså, Petter. (2021) Multiejector CO2 cooling system with evaporative gascooler for a supermarket application in tropical regions. Applied Thermal Engineering. volum 190.
    Academic article
  • Dasi, Koti; Singh, Simarpreet; Guruchethan, A.M.; Maiya, M.P.; Hafner, Armin; Banasiak, Krzysztof; Nekså, Petter. (2020) Performance Evaluation of Ejector Based CO₂ System for Simultaneous Heating and Cooling Application in an Indian Dairy Industry. Thermal Science and Engineering Progress. volum 20.
    Academic article
  • Ishimoto, Yuki; Voldsund, Mari; Nekså, Petter; Roussanaly, Simon; Berstad, David Olsson; Gardarsdottir, Stefania Osk. (2020) Large-scale production and transport of hydrogen from Norway to Europe and Japan: Value chain analysis and comparison of liquid hydrogen and ammonia as energy carriers. International Journal of Hydrogen Energy. volum 45 (58).
    Academic article
  • Singh, Simarpreet; Maiya, Prakash; Hafner, Armin; Banasiak, Krzysztof; Nekså, Petter. (2020) Energy efficient multiejector CO2 cooling system for high ambient temperature. Thermal Science and Engineering Progress. volum 19.
    Academic article
  • Wakimoto, Hiroyuki; Kamimura, Takeshi; Hattori, Kazuhiro; Nekså, Petter; Yamaguchi, Hiroshi. (2020) Dry-ice collection performance and collection mechanism of cyclone separator-evaporator. 33rd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2020).
    Academic article
  • Yamasaki, Haruhiko; Kizilkan, Ônder; Yamaguchi, Hiroshi; Kamimura, Takeshi; Hattori, Kazuhiro; Nekså, Petter. (2020) Experimental investigation of dry ice cyclone separator for ultra‐low temperature energy storage using carbon dioxide. Energy Storage. volum 2 (4).
    Academic article
  • Yamasaki, Haruhiko; Yamaguchi, Hiroshi; Kizilkan, Ônder; Kamimura, Takeshi; Hattori, Kazuhiro; Nekså, Petter. (2020) Experimental investigation of the effect of solid-gas two-phase flow in CO2 cascade refrigeration system. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects.
    Academic article
  • Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael; Schlemminger, Christian. (2019) Experimental investigation of a prototype R-600 compressor for high temperature heat pump. Energy. volum 169.
    Academic article
  • Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael; Schlemminger, Christian. (2019) The development of a hydrocarbon high temperature heat pump for waste heat recovery. Energy. volum 173.
    Academic article
  • Clos, Daniel Perez; Nekså, Petter; Johnsen, Sverre Gullikstad; Aune, Ragnhild Elizabeth. (2019) Investigation on scale formation in aluminium industry by means of a cold-finger. The Minerals, Metals & Materials Series.
    Academic article
  • Jin, Zhequan; Hafner, Armin; Eikevik, Trygve Magne; Nekså, Petter. (2019) Preliminary study on CO2 transcritical ejector enhanced compressor refrigeration system for independent space cooling and dehumidification. International journal of refrigeration. volum 100.
    Academic article
  • Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael; Schlemminger, Christian. (2018) Theoretical analysis of suitable fluids for high temperature heat pumps up to 125 °C heat delivery. International journal of refrigeration. volum 92.
    Academic article
  • Hafner, Armin; Nekså, Petter. (2018) Integrated CO2 solutions for supermarkets. Science et technique du froid. volum 2018-June.
    Academic article
  • Nekså, Petter; Berstad, David Olsson; Størset, Sigmund Østtveit. (2018) Fossil lhjelp til grønt skifte. Dagens næringsliv.
    Feature article
  • Singh, Simarpreet; Maiya, M.P.; Hafner, Armin; Banasiak, Krzysztof; Nekså, Petter. (2018) CO2 refrigeration system for high ambient temperatures. Air Conditioning and Refrigeration Journal. volum 21 (5).
    Article
  • Singh, Simarpreet; Reddy, Amshith; Prakash, Maiya P.; Banasiak, Krzysztof; Hafner, Armin; Nekså, Petter. (2018) Performance investigation of a multi-ejector R744 heat pump. Science et technique du froid. volum 2018-June.
    Academic article
  • Wilhelmsen, Øivind; Berstad, David Olsson; Aasen, Ailo; Nekså, Petter; Skaugen, Geir. (2018) Reducing the exergy destruction in the cryogenic heat exchangers of hydrogen liquefaction processes. International Journal of Hydrogen Energy. volum 43 (10).
    Academic article
  • Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael. (2017) Review of Vapour Compression Heat Pumps for High Temperature Heating using Natural Working Fluids. International journal of refrigeration. volum 80.
    Academic literature review
  • Jin, Zhequan; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin. (2017) A steady and quasi-steady state analysis on the CO2 hybrid ground-coupled heat pumping system. International journal of refrigeration. volum 76.
    Academic article
  • Jin, Zhequan; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin; Wang, Ruzhu. (2017) Annual energy performance of R744 and R410A heat pumping systems. Applied Thermal Engineering. volum 117.
    Academic article
  • Yamasaki, Haruhiko; Yamaguchi, Hiroshi; Hattori, Kazuyuki; Nekså, Petter. (2017) Experimental Observation of CO2 Dry-ice Behavior in an Evaporator/Sublimator. Energy Procedia. volum 143.
    Academic article
  • Hemmingsen, Anne Karin; Nekså, Petter. (2016) Spillvarme inn i varmen. Gemini.
    Feature article
  • Hemmingsen, Anne Karin; Nekså, Petter. (2016) Spillvarme inn i varmen. Dagens næringsliv.
    Feature article
  • Hu, Haitao; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin; Ding, Guoliang; Huang, Qingnan; Ye, Jingjing. (2016) Performance analysis of an R744 ground source heat pump system with air-cooled and water-cooled gas coolers. International journal of refrigeration. volum 63.
    Academic article
  • Jin, Zhequan; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin. (2016) Investigation on CO2 hybrid ground-coupled heat pumping system under warm climate. International journal of refrigeration. volum 62.
    Academic article
  • Nekså, Petter; Hemmingsen, Anne Karin Torstveit. (2016) CO2 gir grønn kjøling. Dagens næringsliv.
    Feature article
  • Berstad, David Olsson; Nekså, Petter. (2015) Flytende vind og gass til Japan?. Dagens næringsliv.
    Feature article
  • DiRenzo, Joseph; Nekså, Petter; Kolsaker, Kjell. (2015) Analysis of Natural Gas engine de-loading on LNG fuelled vessels. Energy Procedia. volum 64 (C).
    Academic article
  • Hafner, Armin; Nekså, Petter. (2015) Il futoro del CO2 : confronto di diverse configurazioni di un sistema ad R744 per supermercati nei paesi piu caldi. Industria & formazione.
    Article
  • Jordal, Kristin; Anantharaman, Rahul; Peters, Thijs; Berstad, David Olsson; Morud, John Christian; Nekså, Petter; Bredesen, Rune. (2015) High-purity H2 production with CO2 capture based on coal gasification. Energy. volum 88.
    Academic article
  • Nekså, Petter. (2015) Preface. Energy Procedia. volum 64 (C).
    Editorial
  • Berstad, David Olsson; Roussanaly, Simon; Skaugen, Geir; Anantharaman, Rahul; Nekså, Petter; Jordal, Kristin. (2014) Energy and Cost Evaluation of A Low-temperature CO2 Capture Unit for IGCC plants. Energy Procedia. volum 63.
    Academic article
  • Hafner, Armin; Nekså, Petter. (2014) System configurations for supermarkets i warm climates applying R744 refrigeration technologies - case study of selected cities. Industria & formazione.
    Popular scientific article
  • Mazzetti, Marit Jagtoyen; Nekså, Petter; Walnum, Harald Taxt; Hemmingsen, Anne Karin. (2014) Energy-Efficient Technologies for Reduction of Offshore CO2 Emissions. Oil and Gas Facilities. volum 3 (1).
    Academic literature review
  • Berstad, David Olsson; Anantharaman, Rahul; Nekså, Petter. (2013) Integrated Low-temperature CO2 Capture from IGCC Power Plant by Partial Condensation and Separation of Syngas. Chemical Engineering Transactions.
    Academic article
  • Berstad, David Olsson; Anantharaman, Rahul; Nekså, Petter. (2013) Low-temperature CCS from an IGCC Power Plant and Comparison with Physical Solvents. Energy Procedia. volum 37.
    Academic article
  • Berstad, David Olsson; Anantharaman, Rahul; Nekså, Petter. (2013) Low-temperature CO2 capture technologies - Applications and potential. International journal of refrigeration. volum 36 (5).
    Academic literature review
  • Kus, Bartosz; Nekså, Petter. (2013) Development of one-dimensional model for initial design and evaluation of oil-free CO2 turbo-compressor. International journal of refrigeration. volum 36 (8).
    Academic article
  • Kus, Bartosz; Nekså, Petter. (2013) Novel partial admission radial compressor for CO2 applications. International journal of refrigeration. volum 36 (8).
    Academic article
  • Kus, Bartosz; Nekså, Petter. (2013) Oil free turbo-compressors for CO2 refrigeration applications. International journal of refrigeration. volum 36 (5).
    Academic article
  • Rohde, Daniel; Walnum, Harald Taxt; Andresen, Trond; Nekså, Petter. (2013) Heat recovery from export gas compression: Analyzing power cycles with detailed heat exchanger models. Applied Thermal Engineering. volum 60 (1-2).
    Academic article
  • Walnum, Harald Taxt; Nekså, Petter; Nord, Lars Olof; Andresen, Trond. (2013) Modelling and simulation of CO2 (carbon dioxide) bottoming cycles for offshore oil and gas installations at design and off-design conditions. Energy. volum 59.
    Academic article
  • Berstad, David Olsson; Nekså, Petter; Anantharaman, Rahul. (2012) Low-temperature CO2 Removal from Natural Gas. Energy Procedia. volum 26.
    Academic article
  • Mazzetti, Marit Jagtoyen; Nekså, Petter. (2012) Tapt kraft til Nytte. Dagens næringsliv. volum 123 (281).
    Feature article
  • Berstad, David Olsson; Nekså, Petter; Reigstad, Gunhild Allard. (2011) Low-temperature syngas separation and CO2 capture for enhanced efficiency of IGCC power plants. Energy Procedia. volum 4.
    Academic article
  • Hafner, Armin; Nekså, Petter; Ladam, Yves; Eikevik, Trygve Magne. (2011) Oljefrie CO2 systemer for industrielle og kommersielle anvendelser. Kulde.
    Academic article
  • Krasae-in, Songwut; Bredesen, Arne Mathias; Stang, Hans Georg Jacob; Nekså, Petter. (2011) Simulation and experiment of a hydrogen liquefaction test rig using a multi-component refrigerant refrigeration system. International Journal of Hydrogen Energy. volum 36 (1).
    Academic article
  • Niu, Xiao-Dong; Yamaguchi, Hiroshi; Iwamoto, Yuhiro; Nekså, Petter. (2011) Experimental study on a CO2-solid-gas-flow-based ultra-low temperature cascade refrigeration system. International Journal of Low-Carbon Technologies. volum 6 (2).
    Academic article
  • Tangen, Grethe; Hemmingsen, Anne Karin; Nekså, Petter. (2011) CREATIV: Research-based innovation for industry energy efficiency. Applied Thermal Engineering. volum 31 (17-18).
    Academic article
  • Walnum, Harald Taxt; Ladam, Yves; Nekså, Petter; Andresen, Trond. (2011) Off-design operation of ORC and CO2 power production cycles for low temperature surplus heat recovery. International Journal of Low-Carbon Technologies. volum 6 (2).
    Academic article
  • Yamaguchi, Hiroshi; Niu, Xiao-Dong; Sekimoto, Kenichi; Nekså, Petter. (2011) Investigation of dry ice blockage in an ultra-low temperature cascade refrigeration system using CO2 as a working fluid. International journal of refrigeration. volum 34 (2).
    Academic article
  • Berstad, David Olsson; Stang, Jacob H; Nekså, Petter. (2010) Large-scale hydrogen liquefier utilising mixed-refrigerant pre-cooling. International Journal of Hydrogen Energy. volum 35 (10).
    Academic article
  • Krasae-in, Songwut; Stang, Jacob H; Nekså, Petter. (2010) Exergy analysis on the simulation of a small-scale hydrogen liquefaction test rig with a multi-component refrigerant refrigeration system. International Journal of Hydrogen Energy. volum 35 (15).
    Academic article
  • Krasae-in, Songwut; Stang, Jacob H; Nekså, Petter. (2010) Simulation on a proposed large-scale liquid hydrogen plant using a multi-component refrigerant refrigeration system. International Journal of Hydrogen Energy. volum 35 (22).
    Academic article
  • Skaugen, Geir; Reigstad, Gunhild Allard; Nekså, Petter; Wahl, Per Eilif. (2010) Use of sophisticated heat exchanger simulation models for investigation of possible design and operational pitfalls in LNG processes. Journal of Natural Gas Science and Engineering. volum 2 (5).
    Academic article
  • Berstad, David Olsson; Stang, Jacob H; Nekså, Petter. (2009) Comparison criteria for large-scale hydrogen liquefaction processes. International Journal of Hydrogen Energy. volum 34 (3).
    Academic article
  • Zha, Shitong; Hafner, Armin (SINTEF); Nekså, Petter (SINTEF). (2008) Investigation of R-744 Voorhees transcritical heat pump system. International journal of refrigeration. volum 31 (1).
    Academic article
  • Aspelund, Audun; Reigstad, Gunhild Allard; Nekså, Petter; Kolsaker, Kjell. (2006) LNG-Chain, a calculation tool for natural gas quality in small-scale LNG distribution chains. Science et technique du froid.
    Academic article
  • Nekså, Petter; Hoggen, Rune Lillethun; Aflekt, Kåre; Jakobsen, Arne; Skaugen, Geir. (2005) Fan-less heat exchanger concept for CO2 heat pump systems. International journal of refrigeration. volum 28.
    Academic article
  • Nekså, Petter; Girotto, Sergio; Minetto, Silvia; Pettersen, Jostein. (2004) Commercial refrigeration system using CO2 as the refrigerant. International journal of refrigeration. volum 27 (7).
    Academic article
  • Munkejord, Svend Tollak; Mæhlum, Harald S.; Zakeri, Gholam R.; Nekså, Petter; Pettersen, Jostein. (2002) Micro technology in heat pumping systems. International journal of refrigeration. volum 25.
    Academic article
  • Nekså, Petter; Pettersen, Jostein. (2002) Air Conditioning and Heat Pump Technology Development in Europe. The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea. volum 31 (7).
    Academic article
  • Pettersen, Jostein; Nekså, Petter. (2002) Financial Times' Global Energy Awards 2001 : NTNU/Sintef CO2-teknologi til finalen. Xergi. volum 42 (1).
    Popular scientific article
  • Nekså, Petter. (2002) CO2 heat pump system. International journal of refrigeration. volum 25 (4).
    Academic article
  • Aarlien, Rune; Pettersen, Jostein; Nekså, Petter; Strømmen, Ingvald; Eikevik, Trygve Magne; Bredesen, Arne Mathias. (2001) Place du CO2 dans les applications frigorifiques et de conditionnement d'air. La Revue Générale du Froid.
    Academic article
  • Strømmen, Ingvald; Bredesen, Arne Mathias; Eikevik, Trygve Magne; Nekså, P.; Pettersen, Jostein; Aarlien, R.. (2000) Refrigeration, Air-conditioning and Heat-Pump Systems for the 21st Century Pompes à chaleur, applicatins frigorifiques et de conditionnement d`air pour le 21e siècle. Bulletin of the International Institute of Refrigeration : Bulletin de l'Institut international du froid. volum LXXX (2).
    Academic article
  • Nekså, Petter; Rekstad, Håvard; Zakeri, G. Reza; Schiefloe, Per Arne. (1998) CO%c-heat pump water heater : characteristics, system design and experimental results. International journal of refrigeration. volum 21 (3).
    Popular scientific article
  • Stene, Jørn; Nekså, Petter. (1998) Highly Efficient CO2 Heat Pump Water Heaters. Heat Pump Centre Newsletter. volum 16 (4).
    Popular scientific article
  • Aarlien, Rune; Nekså, Petter; Pettersen, Jostein. (1996) CO2 som alternativt arbeidsmedium i air-conditioninganlegg og varmepumper for boligformål. Kulde.
    Popular scientific article
  • Aarlien, Rune; Nekså, Petter; Pettersen, Jostein. (1996) Sammenlignende beregninger mellom anlegg med CO2 og R-22. Kulde.
    Popular scientific article

Books

  • Eikevik, Trygve Magne; Nekså, Petter (SINTEF). (2007) Proceedings - 7th IIR Gustav Lorentzen Conference on Natural Working Fluids. 2007. ISBN 2-913149-48-0.
    Non-fiction book
  • Haukås, Hans Torleiv; Stene, Jørn; Rekstad, Inge Håvard; Nekså, Petter (SINTEF); Eikevik, Trygve Magne. (2007) Kjøle- og fryseanlegg med CO2 (R744) som kuldemedium. 2007. ISBN 000-00-000-0000-0.
    Textbook

Part of book/report

  • Cely, Alexandra; Hammer, Morten; Andersen, Hilde; Yang, Tao; Nekså, Petter; Wilhelmsen, Øivind. (2022) Thermodynamic Model Evaluations for Hydrogen Pipeline Transportation. SPE EuropEC - Europe Energy Conference featured at the 83rd EAGE Annual Conference & Exhibition.
    Academic chapter/article/Conference paper
  • Ervik, Åsmund; Saai, Afaf; Berstad, Torodd; Meyer, Ole; Tsuji, Takuma; Oku, Tatsuya; Hattori, Kazuhiro; Yamada, Kazuya; Delhaye, Virgile Roger; Nekså, Petter. (2022) Coupled fluid-solid modelling of the valve dynamics in reciprocating compressors. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
    Academic chapter/article/Conference paper
  • Yamaguchi, H.; Ishikawa, Yuki; Yamasaki, Hiroshi; Kamimura, Takeshi; Hattori, K; Nekså, Petter. (2022) Ultra-low temperature refrigeration system of CO2 using cyclone separator/evaporator. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
    Academic chapter/article/Conference paper
  • Ervik, Åsmund; Saai, Afaf; Berstad, Torodd; Meyer, Ole; Tsuji, Takuma; Oku, Tatsuya; Hattori, Kazuhiro; Yamada, Kazuya; Delhaye, Virgile Roger; Nekså, Petter. (2021) Modelling the dynamics of ring plate valves in reciprocating compressors using coupled CFD-FEM simulations. 10th IIR Conference on Compressors and Refrigerants.
    Academic chapter/article/Conference paper
  • Andresen, Trond; Lingaas, Simon Johan Nilsen; Hagen, Brede; Nekså, Petter. (2020) Dynamic Analysis of Energy Recovery Utilizing Thermal Storage from Batch-Wise Metal Casting. IIR Rankine Conference 2020.
    Academic chapter/article/Conference paper
  • Clos, Daniel Perez; Johnsen, Sverre Gullikstad; Nekså, Petter; Aune, Ragnhild Elizabeth. (2020) The Effect of Hard Scale Deposition on the Wall Heat Flux of a Cold Finger. Light Metals 2020.
    Academic chapter/article/Conference paper
  • Hagen, Brede; Cavo, Matteo; Andresen, Trond; Nekså, Petter. (2020) Gradient Based Design Optimization of a Radial Inflow Turbine. IIR Rankine Conference 2020.
    Academic chapter/article/Conference paper
  • Shahrooz, Mina; Lundqvist, Per; Nekså, Petter. (2020) Effect of Waste Heat Utilization on the Performance of Low Temperature Rankine Cycle. IIR Rankine Conference 2020.
    Academic chapter/article/Conference paper
  • Skjervold, Vidar T.; Skaugen, Geir; Andresen, Trond; Nekså, Petter. (2020) Enabling Power Production from Challenging Industrial Off-Gas – Model-Based Investigation of a Novel Heat Recovery Concept. IIR Rankine Conference 2020.
    Academic chapter/article/Conference paper
  • Tazawa, Taluya; Yoshida, S; Yamasaki, Haruhiko; Wakimoto, Hiroyuki; Yamaguchi, Hiroshi; Kamimura, Takeshi; Hattori, Kazuhiro; Nekså, Petter. (2020) Thermal Characteristics in Supercritical CO2 Along Heating Tube. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
    Academic chapter/article/Conference paper
  • Wakimoto, Hiroko; Uchi, K.; Yamasaki, Haruhiko; Yamaguchi, Hiroshi; Kamimura, Takeshi; Hattori, Kazuyuki; Nekså, Petter. (2020) Basic performance of CO2 cyclone refrigeration system. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
    Academic chapter/article/Conference paper
  • Yamasaki, Haruhiko; Wakimoto, Hiroyuki; Yamaguchi, Hiroshi; Nekså, Petter. (2020) Solar heat recovery system using CO2 as working fluid. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
    Academic chapter/article/Conference paper
  • Banasiak, Krzysztof; Singh, Simarpreet; Hafner, Armin; Maiya, Prakash; Nekså, Petter; Pardiñas, Ángel Á.. (2019) Experimental investigation of CO2 systems for Indian supermarkets with parallel configuration of multiejectors (INDEE). Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
    Academic chapter/article/Conference paper
  • Kumar, Kundan; Singh, Simarpreet; Kumar, Pramod; Maiya, M.P.; Hafner, Armin; Banasiak, Krzysztof; Nekså, Petter. (2019) Experimental analysis of transcritical CO2 booster refrigeration system with heat recovery and ejector expansion. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
    Academic chapter/article/Conference paper
  • Nekså, Petter; Bantle, Michael; Schlemminger, Christian; Bamigbetan, Opeyemi Olayinka. (2019) High temperature industrial heat pumps utilising natural working fluids. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
    Academic chapter/article/Conference paper
  • Nekså, Petter; Røkke, Petter Egil. (2019) Energibruk og utslipp i industrien: Den billigste kilowatttimen. Det Nye Digitale Norge.
    publications.POPVIT_KAPITTEL
  • Schlemminger, Christian; Svendsen, Eirik Starheim; Foslie, Sverre Stefanussen; Bantle, Michael; Bamigbetan, Opeyemi Olayinka; Nekså, Petter. (2019) Performance of high temperature heat pump for simultaneous and efficient production of ice water and process heat. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
    Academic chapter/article/Conference paper
  • Sharooz, Mina; Lindqvist, Per; Nekså, Petter. (2019) Effect of Working Fluid Type on Low Temperature Rankine Cycle Optimization. Proceedings of the 5th International Seminar on ORC Power Systems.
    Academic chapter/article/Conference paper
  • Singh, Simarpreet; Hafner, Armin; Banasiak, Krzysztof; Maiya, Prakash; Nekså, Petter. (2019) Experimental Evaluation of a Multi-Ejector Trans-critical CO2 System for Supermarkets. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
    Academic chapter/article/Conference paper
  • Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael; Schlemminger, Christian. (2018) Experimental investigation of the performance of a hydrocarbon heat pump for high temperature industrial heating. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
    Academic chapter/article/Conference paper
  • Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael; Schlemminger, Christian. (2018) Theoretical analysis for charge reduction in a 200 kW hydrocarbon hight temperature heat pump. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
    Academic chapter/article/Conference paper
  • Blust, Stefanie; Hafner, Armin; Banasiak, Krzysztof; Nekså, Petter. (2018) Possible configurations of multiejector driven CO2 systems for Indian supermarkets. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
    Academic chapter/article/Conference paper
  • Blust, Stefanie; Singh, Simarpreet; Banasiak, Krzysztof; Nekså, Petter. (2018) Environment-friendly refrigeration packs for Indian supermarkets: experimental investigation of energy performance of a multiejector-driven R744 integrated compressor rack. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
    Academic chapter/article/Conference paper
  • Dieryckx, Martin; Chen, Guangming; Gluckman, Ray; Nekså, Petter; Okada, Tetsuji. (2018) Water and space heating heat pumps. Montreal Protocol on Substances that Deplete the Ozone Layer : 2018 report of the Refrigeration, Air Conditioning and Heat Pumps Technical Options Committee.
    Chapter
  • Dorman, Dennis; Calm, James M.; Dieryckx, Martin; Hamed, Samir; Pachai, Alex; Rusignuolo, Gorgio; Nekså, Petter; Hickman, Kenneth E.. (2018) Chillers. Montreal Protocol on Substances that Deplete the Ozone Layer : 2018 report of the Refrigeration, Air Conditioning and Heat Pumps Technical Options Committee.
    Chapter
  • Rajendran, Rajan; Janssen, Martien; Kauffeld, Michael; Lal, D. Mohan; Nekså, Petter; Pedersen, Per-Henrik; Motta, Samuel Yana. (2018) Commercial refrigeration. Montreal Protocol on Substances that Deplete the Ozone Layer : 2018 report of the Refrigeration, Air Conditioning and Heat Pumps Technical Options Committee.
    Chapter
  • Shahrooz, Mina; Lundqvist, Per; Nekså, Petter. (2018) Natural refrigerants for low temperature power cycles. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
    Academic chapter/article/Conference paper
  • Singh, Simarpreet; Banasiak, Krzysztof; Hafner, Armin; Maiya, M.P.; Nekså, Petter. (2018) Performance evaluation of CO2 ejector system with parallel compressor for supermarket application. 17th International Refrigeration and Air Conditioning Conference 2018.
    Academic chapter/article/Conference paper
  • Singh, Simarpreet; Hafner, Armin; Banasiak, Krzysztof; Maiya, Prakash M.; Nekså, Petter. (2018) Experimental evaluation of multi-ejector based CO2 cooling system for supermarkets in tropical zones. 17th International Refrigeration and Air Conditioning Conference 2018.
    Academic chapter/article/Conference paper
  • Singh, Simarpreet; Reddy, Amshith; Parkash, Maiya M.; Banasiak, Krzysztof; Hafner, Armin; Nekså, Petter. (2018) Analysis of R744 refrigeration system with liquid ejectors. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
    Academic chapter/article/Conference paper
  • Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael. (2017) Extending ammonia high temperature heat pump using butane in a cascade system. 7th Conference on Ammonia and CO2 Refrigeration Technology, Ohrid, Macedonia, May 11-13, 2017.
    Academic chapter/article/Conference paper
  • Berstad, David Olsson; Wilhelmsen, Øivind; Skjervold, Vidar T.; Nekså, Petter. (2017) Cryogenic CO2 condensation and membrane separation of syngas for large-scale LH2 production. Cryogenics 2017 : Proceedings of the 14th IIR International Conference, Dresden, Germany, Mai 15-19, 2017..
    Academic chapter/article/Conference paper
  • Clos, Daniel Perez; Andresen, Trond; Nekså, Petter; Johnsen, Sverre Gullikstad; Aune, Ragnhild Elizabeth. (2017) Enabling Efficient Heat Recovery from Aluminium Pot Gas. Light metals 2017.
    Academic chapter/article/Conference paper
  • Kauko, Hanne; Nordtvedt, Stein Rune; Nekså, Petter; Bantle, Michael. (2017) High-temperature heat pumps based on natural working fluids to produce district heating from industrial waste heat. 7th Conference on Ammonia and CO2 Refrigeration Technology, Ohrid, Macedonia, May 11-13, 2017.
    Academic chapter/article/Conference paper
  • Wilhelmsen, Øivind; Skaugen, Geir; Berstad, David Olsson; Aasen, Ailo; Nekså, Petter. (2017) Understanding the physical phenomena that occur inside heat exchangers for liquefaction of hydrogen. Cryogenics 2017 : Proceedings of the 14th IIR International Conference, Dresden, Germany, Mai 15-19, 2017..
    Academic chapter/article/Conference paper
  • Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael. (2016) Evaluation of Natural working fluids for the Development of high temperature heat pumps. 12th IIR Gustav Lorentzen Conference on Natural Refrigerants GL2016 : Proceedings.
    Academic chapter/article/Conference paper
  • Jin, Zhequan; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin; Wang, Ruzhu. (2016) Energy efficiency comparison of heat pumping systems using R744 and R410A as refrigerant. 12th IIR Gustav Lorentzen Conference on Natural Refrigerants GL2016 : Proceedings.
    Academic chapter/article/Conference paper
  • Nekså, Petter; Hafner, Armin; Bredesen, Arne Mathias; Eikevik, Trygve Magne. (2016) CO2 as working fluid - technological development on the road to sustainable refrigeration. 12th IIR Gustav Lorentzen Conference on Natural Refrigerants GL2016 : Proceedings.
    Academic chapter/article/Conference paper
  • Clodic, Denis; Janssen, Martien; Kauffeld, Michael; Nekså, Petter; Pedersen, Per-Henrik; Silva, Alessandro; Rajandran, Rajan. (2015) Commercial refrigeration. Montreal protocol on substances that deplete the ozone layer : UNEP 2014 Report on the refrigeration, air conditioning and heat pumps Technical Options Committee : 2014 assessment.
    Academic chapter/article/Conference paper
  • Dieryckx, Martin; Chen, Guangming; Grozdek, Marino; Kaibara, Makoto; Nekså, Petter; Okada, Tetsuji. (2015) Water heating heat pumps. Montreal protocol on substances that deplete the ozone layer : UNEP 2014 Report on the refrigeration, air conditioning and heat pumps Technical Options Committee : 2014 assessment.
    Academic chapter/article/Conference paper
  • Fidorra, N; Hafner, Armin; Nekså, Petter; Köhler, Jürgen. (2015) Energy cost analysis of heat recovery in CO2 supermarket refrigeration systems. Ammonia and CO2 Refrigeration Technologies - Ohrid, Macedonia April 16-18, 2015 - Proceedings.
    Academic chapter/article/Conference paper
  • Hafner, Armin; Nekså, Petter. (2015) System configurations for supermarkets in warm climates applying R744 refrigeration technologies - case studies of selected cities. 16th European Conference - Latest technologies in refrigeration and air conditioning, Milano 12th-13th June 2015 - Expo 2015.
    Chapter
  • Iwamoto, Yuhiro; Yamasaki, Haruhiko; Niu, Xiao-Dong; Nekså, Petter; Yamaguchi, Hiroshi. (2015) Experimental study on system performance of ultra-low temperature cascade refrigeration system using Carbon Dioxide with tapered evaporator/sublimator. Proceedings of the 24th International Congress of Refrigeration.
    Academic chapter/article/Conference paper
  • Jin, Zhequan; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin; Ding, Guoliang. (2015) ENERGY PERFORMANCE OF CO2 HYBRID GROUND-COUPLED HEAT PUMPING SYSTEM FOR HOTEL APPLICATION. Proceedings of the 24th International Congress of Refrigeration.
    Academic chapter/article/Conference paper
  • Nekså, Petter; Dieryckx, Martin; Chen, Guangming; Grozdek, Marino; kaibara, Makoto; Okada, Tetsuji. (2015) Water Heating Heat Pumps. 2014 REPORT OF THE REFRIGERATION, AIR CONDITIONING AND HEAT PUMPS TECHNICAL OPTIONS COMMITTEE.
    Chapter
  • Nekså, Petter; Janssen, Martien; Kauffeld, Michael; Pedersen, Per-Henrik; Silva, Alessandro; Rajandran, Rajan. (2015) Commercial Refrigeration. 2014 REPORT OF THE REFRIGERATION, AIR CONDITIONING AND HEAT PUMPS TECHNICAL OPTIONS COMMITTEE.
    Chapter
  • Hafner, Armin; Hemmingsen, Anne Karin; Nekså, Petter. (2014) System configuration for supermarkets in warm climates applying R744 refrigeration technologies - case study of selected chinese cities. Proceedings of the 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014.
    Academic chapter/article/Conference paper
  • Jin, Zhequan; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin; Ding, G.; Hu, Haitao. (2014) Transient simulation of R744 hybrid ground coupled heat pump with modelica. Proceedings of the 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014.
    Academic chapter/article/Conference paper
  • Mazzetti, Marit Jagtoyen; Ladam, Yves; Walnum, Harald Taxt; Hagen, Brede Andre Larsen; Skaugen, Geir; Nekså, Petter. (2014) Flexible Combined Heat and Power Systems for Offshore Oil and Gas Facilities With CO2 Bottoming Cycles. ASME 2014 Power Conference - POWER 2014 - Volume 2.
    Academic chapter/article/Conference paper
  • Nekså, Petter. (2014) Carbon dioxide applications. CO2 as a refrigerant.
    Academic chapter/article/Conference paper
  • Skaugen, Geir; Walnum, Harald Taxt; Hagen, Brede Andre Larsen; Clos, Daniel Perez; Mazzetti, Marit Jagtoyen; Nekså, Petter. (2014) Design and optimization of waste heat recovery unit using carbon dioxide as cooling fluid. ASME 2014 Power Conference - POWER 2014 - volume 1.
    Academic chapter/article/Conference paper
  • Yamaguchi, H.; Iwamoto, Y; Ozaki, S; Nekså, Petter. (2014) Experimental observation of sedimentation phenomena of CO2 dry ice in model channel. Proceedings of the 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014.
    Academic chapter/article/Conference paper
  • Ye, Jingjing; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin; Ding, G.; Hu, H.. (2014) Performance and economy analysis of a solar assisted CO2 ground source heat pump with air-cooled gas cooler under different climate conditions. Proceedings of the 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014.
    Academic chapter/article/Conference paper
  • Hafner, Armin; Justo Alonso, Maria; Schmälzle, Christian; Nekså, Petter. (2013) High efficient 18-90 m3/h R744 compressor. Compressors 2013 : 8th International Conference on Compressors and Coolants.
    Academic chapter/article/Conference paper
  • Mazzetti, Marit Jagtoyen; Nekså, Petter; Walnum, Harald Taxt; Hemmingsen, Anne Karin. (2013) Novel energy efficiency technologies for reduction of offshore CO2 emissions. Offshore Technology Conference.
    Academic chapter/article/Conference paper
  • Hafner, Armin; Poppi, Stefano; Nekså, Petter; Minetto, Silvia; Eikevik, Trygve Magne. (2012) Development of Commersial Refrigeration Systems with Heat Recovery for Supermaket Buildings. Proceedings of 10th IIR Gustav Lorentzen Conference, June 25 - 27 2012 Delft, the Netherlands.
    Academic chapter/article/Conference paper
  • Hafner, Armin; Schmälzle, Christian; Nekså, Petter; Obrist, Frank; Rekstad, Inge Håvard. (2012) High efficient 100 kW elR744 compressor. Proceedings of 10th IIR Gustav Lorentzen Conference, June 25 - 27 2012 Delft, the Netherlands.
    Academic chapter/article/Conference paper
  • Kus, Bartosz; Nekså, Petter. (2012) Oil Free Turbo-Compressors For Refrigeration Applications. Proceedings of 10th IIR Gustav Lorentzen Conference, June 25 - 27 2012 Delft, the Netherlands.
    Academic chapter/article/Conference paper
  • Quack, Hans; Essler, Jürgen; Haberstroh, Christoph; Walnum, Harald Taxt; Berstad, David Olsson; Drescher, Michael; Nekså, Petter. (2012) Search for the Best Processes to Liquefy Hydrogen in Very Large Plants. Proceedings : the 12th Cryogenics 2012 IIR International Conference, Dresden, Germany, September 11-14, 2012.
    Academic chapter/article/Conference paper
  • Rohde, Daniel; Ladam, Yves; Walnum, Harald Taxt; Nekså, Petter. (2012) Heat pumps for steam production from waste heat. Proceedings of 10th IIR Gustav Lorentzen Conference, June 25 - 27 2012 Delft, the Netherlands.
    Academic chapter/article/Conference paper
  • Titze, Maren; Lemke, Nicholas; Nekså, Petter; Hafner, Armin; Köhler, Jürgen. (2012) Dynamic modeling of a combined supermarket refrigeration and HVAC system. Proceedings of 10th IIR Gustav Lorentzen Conference, June 25 - 27 2012 Delft, the Netherlands.
    Academic chapter/article/Conference paper
  • Walnum, Harald Taxt; Berstad, David Olsson; Drescher, Michael; Nekså, Petter; Quack, Hans; Haberstroh, Christoph; Essler, Jürgen. (2012) Principles for the Liquefaction of Hydrogen with Emphasis on Precooling Processes. Proceedings : the 12th Cryogenics 2012 IIR International Conference, Dresden, Germany, September 11-14, 2012.
    Academic chapter/article/Conference paper
  • Berstad, David Olsson; Anantharaman, Rahul; Nekså, Petter. (2011) Potential for low-temperature concepts in different CCS applications. Proceedings of the 23rd International Congress of Refrigeration.
    Academic chapter/article/Conference paper
  • Berstad, David Olsson; Nekså, Petter; Anantharaman, Rahul. (2011) Low-temperature syngas separation for CO2 capture from an IGCC power plant. Proceedings of the 23rd International Congress of Refrigeration.
    Academic chapter/article/Conference paper
  • Hafner, Armin; Nekså, Petter; Ladam, Yves; Eikevik, Trygve Magne. (2011) OIL-FREE R744 SYSTEMS FOR INDUSTRIAL/COMMERCIAL APPLICATIONS. Proceedings of the 23rd International Congress of Refrigeration.
    Academic chapter/article/Conference paper
  • Nekså, Petter; Berstad, David Olsson; Anantharaman, Rahul. (2011) Overview of current and possible applications for refrigeration technologies within CCS. Proceedings of the 23rd International Congress of Refrigeration.
    Academic chapter/article/Conference paper
  • Nekså, Petter; Čermák, Radim; Kauffeld, Michael; Pachai, Alexander C.; Wild, Yves; Cavalier, Gerald; Xie, Ruhe; Colborne, Daniel. (2011) Transport Refrigeration. 2010 REPORT OF THE REFRIGERATION, AIR CONDITIONING AND HEAT PUMPS TECHNICAL OPTIONS COMMITTEE.
    Chapter
  • Nekså, Petter; Clodic, Denis; Kauffeld, Michael; Pedersen, Per-Henrik; Peixoto, Roberto. (2011) Commercial Refrigeration. 2010 REPORT OF THE REFRIGERATION, AIR CONDITIONING AND HEAT PUMPS TECHNICAL OPTIONS COMMITTEE.
    Chapter
  • Nekså, Petter; Hickman, Kenneth E.; Calm, James M.; Chen, Guangming; Crawford, Jim; Dorman, Dennis; Pachai, Alexander C.; Pearson, Andy; Colbourne, Daniel; Ohtsuki, Akira. (2011) Chillers. 2010 REPORT OF THE REFRIGERATION, AIR CONDITIONING AND HEAT PUMPS TECHNICAL OPTIONS COMMITTEE.
    Chapter
  • Nekså, Petter; kaibara, Makoto; Dieryckx, Martin; Keller, Fred J.; Calm, James M.; Colbourne, Daniel; Pachai, Alexander C.; Hickman, Kenneth E.; Nordman, Roger. (2011) Heat Pumps. 2010 REPORT OF THE REFRIGERATION, AIR CONDITIONING AND HEAT PUMPS TECHNICAL OPTIONS COMMITTEE.
    Chapter
  • Nekså, Petter; Keller, Fred J.; Colbourne, Daniel; Devotta, Sukumar; Agarwal, Radhey; Crawford, Jim; Dieryckx, Martin; kaibara, Makoto; McInerney, Ed; Nelson, Horace A.; Vodianitskaia, Paulo. (2011) Air-to-Air Air Conditioners and Heat Pumps. 2010 REPORT OF THE REFRIGERATION, AIR CONDITIONING AND HEAT PUMPS TECHNICAL OPTIONS COMMITTEE.
    Chapter
  • Tangen, Grethe; Hemmingsen, Anne Karin; Lorentsen, Odd-Arne; Nekså, Petter. (2011) Energy efficiency in industry - a main path for increased value creation and sustainable energy use. Proceedings of the 23rd International Congress of Refrigeration.
    Academic chapter/article/Conference paper
  • Hafner, Armin; Christensen, Øystein Torp; Nekså, Petter. (2010) Reversible R744 (CO2) heat pumps applied in public trains. 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids.
    Academic chapter/article/Conference paper
  • Hafner, Armin; Ladam, Yves; Andresen, Trond; Nekså, Petter. (2010) Experimental investigation of different ejector geometries for R-744 transcritical systems. 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids.
    Academic chapter/article/Conference paper
  • Hafner, Armin; Nekså, Petter. (2007) Global environmental and economic benefits of introducing R-744 mobile air conditioning. Proceedings : 22nd International Congress of Refrigeration : Refrigeration creates the future.
    Academic chapter/article/Conference paper
  • Stene, Jørn; Andresen, Trond; Skiple, Torgeir; Nekså, Petter. (2007) CO2 Heat pump system for combined heating and cooling of non-residential buildings. Proceedings : 22nd International Congress of Refrigeration : Refrigeration creates the future.
    Academic chapter/article/Conference paper
  • Hafner, Armin; Nekså, Petter. (2006) Global environmental consequences of introducing R-744 (CO2) mobile air conditioning. 7th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2006).
    Academic chapter/article/Conference paper
  • Hafner, Armin; Nekså, Petter. (2006) Globale Konsequenzen bei der Einführung von Fahrzeugklimaanlagen mit dem Kältemittel R-744. Deutsche Kälte-Klima-Tagung 2006 Dresden.
    Academic chapter/article/Conference paper
  • Nekså, Petter. (2006) Performance of CO2-refrigeration (R-744) in commercial cold drink equipment. 7th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2006).
    Academic chapter/article/Conference paper
  • Nekså, Petter. (2005) Refrigeration sector. IPCC/TEAP special report on safeguarding the ozone layer and the global climate system : issues related to hydrofluorocarbons and perfluorocarbons.
    Academic chapter/article/Conference paper
  • Jakobsen, Arne; Skaugen, Geir; Skiple, Torgeir; Nekså, Petter; Andresen, Trond. (2004) Development and Evaluation of a Reversible CO2 Residential Air Conditioning System Compared to State-of-the-Art R410A Unit. 6th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2004).
    Academic chapter/article/Conference paper

Report

  • Abdelaziz, Omar; Carvalho, Suely; Woodcock, Ashley; Agyarko, Kofi; Altoé, Paulo; Bhambure, Jitendra; Colbourne, Daniel; Dohnt, Hilde; Dreyfus, Gabrielle; Elassaad, Bassam; Gluckman, Ray; Hamed, Samir; Herlianika, Herlin; Kujak, Steven; Kumar, Saurabh; Li, Tingxun; Lord, Richard; Nekså, Petter; Okada, Tetsuji; Olama, Mohamed Alaa; Peixoto, Roberto; Shah, Nihar; Rajendran, Rajan; Rochat, Helene. (2022) Montreal protocol on substances that deplete the ozon layer: report of the Technology and Economic Assessment Panel. Volume 3: Decision XXXIII/5 - Continued provision of information on energy-efficient and low-global-warming-potential technologies. United Nations Environment Programme. 2022. ISBN 978-9966-076-95-3.
    Report
  • Abdelaziz, Omar; Elassaad, Bassam; Bhambure, Jitendra; Kuijpers, Lambert J.M.; Nekså, Petter; Pachai, Alexander C.; Peixoto, Roberto; Polonara, Fabio; Rajendran, N.. (2021) Montreal Protocol on Substances that Deplete the Ozone Layer : Report of the Refrigeration Technical Options Committee Vaccines Cold Chain Subcommittee Addendum to the TEAP 2021 Progress Report. United Nations Environment Programme. 2021. ISBN 978-9966-076-90-8.
    Report
  • Tomasgard, Asgeir; Berstad, David Olsson; Blekkan, Edd Anders; Karstad, Per Ivar; Burheim, Odne Stokke; Dawson, James; Espegren, Kari Aamodt; Løvås, Terese; Meyer, Julien; Møller-Holst, Steffen; Nekså, Petter; Pollet, Bruno; Størset, Sigmund Østtveit; Sundseth, Kyrre; Thomassen, Magnus; Ulleberg, Øystein. (2019) Hydrogen i fremtidens lavkarbonsamfunn. 2019. ISBN 978-82-93198-31-4.
    Report
  • Ervik, Åsmund; Saai, Afaf; Meyer, Ole; Nekså, Petter. (2018) Modelling of mechanical and flow processes in compressors. 2018.
    Report
  • Haukås, Hans T.; Stene, Jørn; Rekstad, Inge Håvard; Nekså, Petter; Hafner, Armin; Eikevik, Trygve Magne. (2016) CO2 (R744) som kuldemedium. 2016.
    Compendium
  • Elgsæther, Munan; Nekså, Petter; Skaugen, Geir; Rekstad, Håvard. (2002) CO2 as refrigerant in beverage coolers, Evaluation and prototype testing. 2002. SINTEF Rapport (TRF5738).
    Report
  • Pettersen, Jostein; Nekså, Petter; Rekstad, Håvard. (2002) Testing and evaluation of a condensing unit in a residential air conditioning system. 2002. SINTEF Rapport (TRF5686).
    Report
  • Rekstad, Håvard; Nekså, Petter. (2002) Testing and evaluation of CO2 compressors for the NBC project. Item 2. Compresosr tests at SINTEF. 2002. SINTEF Rapport (TRF5717).
    Report
  • Nekså, Petter; Bredesen, Arne Mathias. (2000) Short Course on CO2 Refrigeration Technology (SC7). 2000.
    Compendium
  • Rekstad, Håvard; Nekså, Petter; Bredesen, Arne Mathias. (1999) Measurements on semi-hermetic pre-series CO2 compressors. 1999. ISBN 82-594-1675-1.
    Report
  • Haukås, Hans; Brendeng, Einar; Lorentzen, Gustav; Owren, Geir; Nekså, Petter; Aflekt, Kåre; Jørstad, Oddvar; Lystad, Tor; Nesje, Odd; Sandbakk, Marit. (1994) KFK-fri teknologi for kuldeanlegg og varmepumper : kompendiesamling nytt EEU-kurs. 1994.
    Compendium
  • Nekså, Petter. (1994) Erstatningsmedier for HKFK-22. 1994.
    Compendium

PRODUKT

  • Røkke, Petter Egil; Nekså, Petter. (2021) Episode 393 – Om varmetap med Petter Røkke og Petter Nekså. Teknisk ukeblad. 2021.
    Sound material
  • Nekså, Petter. (2020) How CO2 Can Help The Climate. SINTEF Energi AS. 2020.
    Multimedia product
  • Nekså, Petter. (2020) Hydrogen can contribute to decarbonizing the European energy system. SINTEF Energi. 2020.
    Multimedia product
  • Nekså, Petter. (2020) Norsk teknologi kan kutte 0,5 grader global oppvarming!. SINTEF Energi. 2020.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep1: Utnytte industriell overskuddsvarme. SINTEF Energi, Facebook. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep1: Utnytte industriell overskuddsvarme. SINTEF Energi. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep2: Hvor bruker man arbeidsmedier?. SINTEF Energi. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep2: Hvor bruker man arbeidsmedier?. SINTEF Energi. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep3: Er kunstige arbeidsmedier egentlig så farlige?. SINTEF Energi, Facebook. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep3: Er kunstige arbeidsmedier egentlig så farlige?. SINTEF Energi. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep4: CO2 som arbeidsmedium. SINTEF Energi, Facebook. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep4: CO2 som kuldemedium. SINTEF Energi. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep5: Arbeidsmedier og overskuddsvarme. SINTEF Energi. 2018.
    Multimedia product
  • Nekså, Petter. (2018) Naturlige arbeidsmedier Ep5: Konvertering av overskuddsvarme. SINTEF Energi, Facebook. 2018.
    Multimedia product

INFORMASJONSMATR

  • Nekså, Petter. (2022) Bør jeg kjøpe varmepumpe? Vil det lønne seg?.
    Website (informational material)
  • Røkke, Petter Egil; Kauko, Hanne; Nekså, Petter. (2022) Industrial neighbours can share excess energy.
    Website (informational material)
  • Gardarsdottir, Stefania Osk; Nekså, Petter. (2021) Assumptions Matter When Assessing Blue & Green Hydrogen.
    Website (informational material)
  • Røkke, Petter Egil; Kauko, Hanne; Nekså, Petter. (2021) Industrinaboer kan dele overskuddsenergi.
    Website (informational material)
  • Berstad, David Olsson; Nekså, Petter. (2018) Ambisiøse planer for hydrogen i Japan.
    Website (informational material)
  • Nekså, Petter. (2017) FN-møte i Jordan for å fase ut klimagasser.
    Website (informational material)
  • Nekså, Petter. (2016) What is the role for gas in the future?.
    Website (informational material)
  • Jordal, Kristin; Berstad, David Olsson; Nekså, Petter. (2015) Hydrogen cars: The role of fossil fuels and CCS in a cleaner transport system.
    Website (informational material)
  • Jordal, Kristin; Berstad, David Olsson; Nekså, Petter. (2015) The role of fossil fuels and CCS in a cleaner transport system.
    Website (informational material)
  • Nekså, Petter. (2015) Energisk mellom Japan og Norge.
    Briefs

Teaching

Courses

  • TEP4185 - Gas Technology
  • TEP4906 - Sustainable energy systems, master thesis
  • TEP4521 - Sustainable Energy Systems, Specialization Project
  • TEP4506 - Sustainable Energy Systems, Specialization Course

Media

2023

  • Interview
    Nekså, Petter. (2023) Forsker og jazz-ildsjel fikk pris. Adresseavisen [Avis]. 2023-03-15.

2022

  • Interview
    Nekså, Petter. (2022) 20 Twh overskuddsvarme slippes rett ut. Norsk Fjernvarme [Fagblad]. 2022-09-09.
  • Interview
    Nekså, Petter. (2022) Consumer, Power | These power-saving measures have no effect in practice. Archenewsy [Internett]. 2022-11-08.
  • Interview
    Nekså, Petter. (2022) Disse strømspare-tiltakene har i praksis ingen effekt. Nettavisen [Avis]. 2022-11-04.
  • Interview
    Nekså, Petter. (2022) Disse strømspare-tiltakene har i praksis ingen effekt. Sandnesposten [Avis]. 2022-11-04.
  • Interview
    Nekså, Petter. (2022) Disse strømspare-tiltakene har i praksis ingen effekt. Jærbladet [Avis]. 2022-11-04.
  • Interview
    Nekså, Petter. (2022) Disse strømspare-tiltakene har i praksis ingen effekt. Nordlys [Avis]. 2022-11-04.
  • Interview
    Nekså, Petter. (2022) Disse strømspare-tiltakene har i praksis ingen effekt. Telemarksavisa [Avis]. 2022-11-05.
  • Interview
    Nekså, Petter. (2022) Disse strømspare-tiltakene har i praksis ingen effekt. Gudgransdølen Dagningen [Avis]. 2022-11-05.
  • Interview
    Nekså, Petter. (2022) Disse strømspare-tiltakene har i praksis ingen effekt. Oppland Arbeiderblad [Avis]. 2022-11-05.
  • Interview
    Nekså, Petter. (2022) Disse strømspare-tiltakene har i praksis ingen effekt. Tidens krav [Internett]. 2022-11-05.
  • Interview
    Nekså, Petter. (2022) Disse strømspare-tiltakene har i praksis ingen effekt. Arbeidets Rett [Avis]. 2022-11-05.
  • Interview
    Nekså, Petter. (2022) Disse strømspare-tiltakene har i praksis ingen effekt. Fredrikstad Blad [Avis]. 2022-11-06.
  • Interview
    Nekså, Petter. (2022) Disse strømsparetiltakene har i praksis ingen effekt. Moss Avis [Avis]. 2022-11-14.
  • Interview
    Nekså, Petter. (2022) Disse strømsparetiltakene har i praksis ingen effekt. Vestby Avis [Avis]. 2022-11-10.
  • Interview
    Nekså, Petter. (2022) Industrien fyrer for kråkene. Aftenposten [Avis]. 2022-09-10.
  • Interview
    Nekså, Petter. (2022) Norsk industri fyrer fortsatt for kråkene. MN24 [Fagblad]. 2022-09-09.
  • Interview
    Nekså, Petter. (2022) Norsk industri fyrer fortsatt for kråkene. Dagens Perspektiv [Avis]. 2022-09-09.
  • Interview
    Nekså, Petter. (2022) Norsk industri fyrer fortsatt for kråkene. Byggeindustrien [Fagblad]. 2022-09-09.
  • Interview
    Nekså, Petter. (2022) Norsk industri fyrer fortsatt for kråkene. DN [Avis]. 2022-09-19.
  • Interview
    Nekså, Petter. (2022) Norsk industri fyrer fortsatt for kråkene. Stavanger Aftenblad [Avis]. 2022-09-10.
  • Interview
    Nekså, Petter. (2022) Norsk industri fyrer fortsatt for kråkene. Adresseavisen [Avis]. 2022-09-10.
  • Interview
    Nekså, Petter. (2022) Norsk industri fyrer fortsatt for kråkene. Oppland Arbeiderblad [Avis]. 2022-09-10.
  • Interview
    Nekså, Petter. (2022) Norsk industri fyrer fortsatt for kråkene. Fremover [Internett]. 2022-09-09.
  • Interview
    Nekså, Petter. (2022) Norsk industri fyrer fortsatt for kråkene. NRK [Internett]. 2022-09-09.
  • Interview
    Nekså, Petter. (2022) Norsk industri fyrer framleis for kråkene. Kvinnheringen [Avis]. 2022-09-09.
  • Interview
    Nekså, Petter. (2022) Norsk industri fyrer framleis for kråkene. Nordre [Avis]. 2022-09-09.
  • Interview
    Nekså, Petter. (2022) Norsk industri fyrer framleis for kråkene. Møre-nytt [Avis]. 2022-09-12.
  • Interview
    Nekså, Petter. (2022) Sett aldri varmepumpa på «Auto». TU [Fagblad]. 2022-06-18.
  • Interview
    Nekså, Petter. (2022) Sett aldri varmepumpa på «auto». Fagpressenytt [Internett]. 2022-06-16.
  • Interview
    Nekså, Petter. (2022) Sett aldri varme­pumpa på «auto». forskersonen [Internett]. 2022-06-16.
  • Interview
    Nekså, Petter. (2022) Strømkrisen til tross – industrien fyrer for kråkene. TU [Fagblad]. 2022-09-09.
  • Interview
    Nekså, Petter; Røkke, Petter Egil. (2022) 20 Twh overskuddsvarme slippes rett ut. Norsk fjernvarme [Fagblad]. 2022-09-09.

2021

  • Academic lecture
    Ervik, Åsmund; Saai, Afaf; Berstad, Torodd; Meyer, Ole; Tsuji, Takuma; Oku, Tatsuya; Hattori, Kazuhiro; Yamada, Kazuya; Delhaye, Virgile Roger; Nekså, Petter. (2021) Modelling the dynamics of ring plate valves in reciprocating compressors using coupled CFD-FEM simulations. 10th International Conference on Compressors and Coolants . Slovak Association for Cooling and Air Conditioning Tech.; 2021-01-13 - 2021-01-15.
  • Interview
    Nekså, Petter. (2021) Millilardprosjekt skal gjera Barents-gass til ein del av klimaløysinga. Stavanger Aftenblad [Avis]. 2021-06-01.
  • Interview
    Røkke, Petter Egil; Nekså, Petter. (2021) Norge mister 20 TWh årlig i varmetap – disse forskerne vil bruke energien i stedet. null [Fagblad]. 2021-11-04.
  • Interview
    Røkke, Petter Egil; Nekså, Petter; Knudsen, Brage Rugstad. (2021) Vi kan bruke spillvarme til å lage norske avokadofarmer. Dagens Næringslilv [Avis]. 2021-03-25.

2020

  • Interview
    Nekså, Petter. (2020) Bedre HVAC-systemer kan hjelpe hotellnæringen. VVS Aktuelt [Fagblad]. 2020-06-17.
  • Interview
    Nekså, Petter. (2020) Historien om CO2 som kjølemedium. sintef.no [Internett]. 2020-06-03.
  • Interview
    Nekså, Petter. (2020) Norske hoteller kan redusere strømregningen med hele 44 prosent. ITBA Aktuelt [Internett]. 2020-06-18.
  • Interview
    Nekså, Petter. (2020) Slik kan hotellene halvere strømregningen. enerWE [Fagblad]. 2020-06-17.
  • Interview
    Nekså, Petter. (2020) Standard for brannfarlige kuldemedier i varmepumper til avstemning. VVSFORUM [Fagblad]. 2020-10-21.
  • Interview
    Nekså, Petter. (2020) Standard for brannfarlige kuldemedier i varmepumper til avstemning. VVS aktuelt [Fagblad]. 2020-10-21.
  • Interview
    Nekså, Petter. (2020) The story of CO2 as a refrigerant. sintef.no [Internett]. 2020-04-20.
  • Lecture
    Nekså, Petter; Andresen, Trond. (2020) FME HighEFF – Anlegg for utnyttelse av overskuddsvarme til kraftproduksjon. Norsk Kjøleteknisk Møte 2020 . Norsk Kjøleteknisk Forening - Tekna; Clarion Hotell og Konferansesenter, Trondheim. 2020-10-29 - 2020-10-29.
  • Lecture
    Nikolaisen, Monika; Nekså, Petter. (2020) Measuring achievement of the HighEFF overall goals. HighEFF Annual Consortium Meeting 2020 ; 2020-05-13 - 2020-05-13.

2019

  • Lecture
    Ervik, Åsmund; Saai, Afaf; Meyer, Ole; Nekså, Petter. (2019) Dynamic modelling of compressor ring plate valve behaviour with CFD and FEM. HighEFF Annual Consortium Meeting 2019 . SINTEF Energi; Trondheim. 2019-05-08 - 2019-05-09.
  • Interview
    Nekså, Petter. (2019) Skal berge skiløypene. NRK [Internett]. 2019-04-15.
  • Interview
    Nekså, Petter. (2019) VM-stadionet forurenser like mye hver dag som å kjøre bil 20 ganger rundt ekvator. NRK [Internett]. 2019-10-04.
  • Lecture
    Skjervold, Vidar T.; Andresen, Trond; Skaugen, Geir; Nekså, Petter. (2019) Novel heat recovery concept development. Practical vs. Academic approach to Energy Recovery ; 2019-10-22.

2018

  • Academic lecture
    Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael; Schlemminger, Christian; Dallai, Mauro. (2018) Experimental Investigation of a Hydrocarbon Piston Compressor for High Temperature Heat Pumps. 24th International Compressor Engineering Conference ; Purdue. 2018-07-12.
  • Academic lecture
    Berstad, David Olsson; Anantharaman, Rahul; Wilhelmsen, Øivind; Skjervold, Vidar T.; Nekså, Petter. (2018) Large-Scale Hydrogen Production and Liquefaction for Regional and Global Export. International Hydrogen and Fuel Cells Conference . SINTEF, NTNU; Trondheim. 2018-05-14 - 2018-05-15.
  • Lecture
    Berstad, David Olsson; Nekså, Petter; Størset, Sigmund Østtveit. (2018) Large-scale decarbonised hydrogen production. Offshore Northern Seas (ONS) 2018 ; 2018-08-27 - 2018-08-30.
  • Poster
    Berstad, David Olsson; Wilhelmsen, Øivind; Voldsund, Mari; Nekså, Petter; Ishimoto, Yuki. (2018) Large-scale co-production of liquid hydrogen from fossil and renewable energy. 22nd World Hydrogen Energy Conference ; 2018-06-17 - 2018-06-22.
  • Lecture
    Claussen, Ingrid Camilla; Røyrvik, Jens Olgard Dalseth; Nekså, Petter. (2018) Role of Industry Clusters for improving energy efficiency. 10th KIFEE symposium . Kifee Kyoto Norway Centre; Norwegian Coastal Express/Tromsø. 2018-10-05 - 2018-10-08.
  • Lecture
    Ishimoto, Yuki; Voldsund, Mari; Berstad, David Olsson; Nekså, Petter. (2018) Value chain analysis for long distance transport of hydrogen carriers. 22nd World Hydrogen Energy Conference ; 2018-06-17.
  • Lecture
    Ishimoto, Yuki; Voldsund, Mari; Berstad, David Olsson; Nekså, Petter; Iida, Shigeki. (2018) Value chain analysis of long-distance hydrogen transport. 10th Kyoto International forum for energy and environment symposium (KIFEE-10) ; 2018-10-05.
  • Academic lecture
    Kauko, Hanne; Selvnes, Håkon; Knudsen, Brage Rugstad; Hafner, Armin; Nekså, Petter. (2018) Thermal storage for improved energy efficiency in the industry. 10th KIFEE symposium . NTNU og University of Doshisha; MS Finnmarken. 2018-10-05 - 2018-10-08.
  • Interview
    Nekså, Petter. (2018) Det blir mer klimavennlig snø. Skiforbundet [Fagblad]. 2018-12-11.
  • Interview
    Nekså, Petter. (2018) We skiën tegen de klippen op. trouw.nl [Fagblad]. 2018-12-02.
  • Interview
    Nekså, Petter; Berstad, David Olsson; Størset, Sigmund Østtveit. (2018) Fossil hjelp til grønt skifte. Dagens Næringsliv [Avis]. 2018-05-25.

2017

  • Lecture
    Andresen, Trond; Nekså, Petter. (2017) Thermodynamics for dummies. HighEff Annual Consortium Meeting 2017 . SINTEF Energi AS; Trondheim. 2017-06-19 - 2017-06-20.
  • Lecture
    Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael. (2017) Extending ammonia high temperature heat pump using butane in a cascade system. 7th Conference on Ammonia and CO2 Refrigeration Technologies . Faculty of Mechanical Engineering - Skopje; Ohrid. 2017-05-11 - 2017-05-13.
  • Lecture
    Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael; Banasiak, Krzysztof. (2017) Extending Hydrocarbon Heat Pumps to Higher Temperatures: Predictions from Simulations. 30th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems ; San Diego. 2017-07-02 - 2017-07-06.
  • Academic lecture
    Berstad, David Olsson; Wilhelmsen, Øivind; Skjervold, Vidar T.; Nekså, Petter. (2017) Cryogenic CO2 condensation and membrane separation of syngas for large-scale LH2 production. 14th CRYOGENICS 2017 IIR International Conference . IIR; Dresden. 2017-05-15 - 2017-05-19.
  • Academic lecture
    Clos, Daniel Perez; Gaertner, Heiko; Nekså, Petter; Johnsen, Sverre Gullikstad; Aune, Ragnhild Elizabeth. (2017) DESIGN OF A COOLED FOULING PROBE TO INVESTIGATE SCALING MECHANISMS FROM THE ALUMINIUM PRODUCTION OFF-GAS. Heat Exchanger Fouling and Cleaning XII . HTRI; Madrid. 2017-06-11 - 2017-06-16.
  • Academic lecture
    Clos, Daniel Perez; Nekså, Petter. (2017) Heat recovery from Al off-gases. SFI høst møte 2017 . NTNU-IMA; Trondheim. 2017-11-07 - 2017-11-08.
  • Academic lecture
    Clos, Daniel Perez; Nekså, Petter; Johnsen, Sverre Gullikstad; Aune, Ragnhild Elizabeth. (2017) Scaling in Heat Recovery Systems for Aluminium Production Off-Gas. SFI vår møte 2017 ; 2017-04-25 - 2017-04-26.
  • Academic lecture
    Kauko, Hanne; Nordtvedt, Stein Rune; Nekså, Petter; Bantle, Michael. (2017) High-temperature heat pumps based on natural working fluids to produce district heating from industrial waste heat. 7th Conference on Ammonia and CO2 Refrigeration Technologies . International Institute of Refrigeration (IIR); Ohrid. 2017-05-11 - 2017-05-13.
  • Interview
    Nekså, Petter. (2017) - Vet at alle i skisporten er opptatt av snøtilgang. Adresseavisen [Avis]. 2017-11-14.
  • Interview
    Nekså, Petter. (2017) A Norwegian project: Snow for the future. JARN [Internett]. 2017-06-06.
  • Interview
    Nekså, Petter. (2017) A future for skiing in a warmer world. Science Daily [Tidsskrift]. 2017-02-01.
  • Interview
    Nekså, Petter. (2017) A future for skiing in a warmer world. AlphaGalileo [Tidsskrift]. 2017-02-01.
  • Interview
    Nekså, Petter. (2017) «Det var alltid veldig mye snø da jeg var liten». Fredrikstad blad [Avis]. 2017-01-28.
  • Interview
    Nekså, Petter. (2017) Erik Røste, skipresident, Norges skiforbund, er bekymret for fremtiden. NRK Dagsrevyen [TV]. 2017-01-28.
  • Interview
    Nekså, Petter. (2017) Får millioner for å lage snø i varmen. E24 [Avis]. 2017-02-04.
  • Academic lecture
    Nekså, Petter. (2017) GAS TO MARKET –HOW TO OVERCOME THE DISTANCE FROM REMOTE PRODUCTION. Arctic Frontiers - The Offshore Arctic under Lower Oil Prices . Arctic Frontiers and IEA Global Techn Coll. Progr. (IEA GOT); Tromsø. 2017-01-25 - 2017-01-26.
  • Interview
    Nekså, Petter. (2017) Klimaforsker: – Det var lengre vintre og mer snø før. amta.no [Internett]. 2017-01-28.
  • Interview
    Nekså, Petter. (2017) Kolumne "nachgeforscht": Grüner gleiten. Maerkische Oderzeitung [Fagblad]. 2017-03-20.
  • Interview
    Nekså, Petter. (2017) Kolumne "nachgeforscht": Grüner gleiten. Märkische online zeitung [Fagblad]. 2017-02-11.
  • Interview
    Nekså, Petter. (2017) Kuldeteknikk. TV2 Nyhetskanalen [TV]. 2017-02-22.
  • Lecture
    Nekså, Petter. (2017) Low carbon solutions for the blue economy: The role of technology and innovation. Arctic Frontiers, Arctic Environment Forum . Arctic Frontiers Secretariat; Tromsø. 2017-01-23 - 2017-01-26.
  • Interview
    Nekså, Petter. (2017) MØRKE UTSIKTER. Dagbladet Magasinet [Avis]. 2017-04-08.
  • Interview
    Nekså, Petter. (2017) Norway saves skiing with climate-friendly snow. Scandinavian Times [Avis]. 2017-02-12.
  • Interview
    Nekså, Petter. (2017) Norway saves skiing with climate-friendly snow. Environmentalresearchweb [Internett]. 2017-02-16.
  • Interview
    Nekså, Petter. (2017) Norwegian eco snow machines secure the future of skiing. Association Iinternationale de la Presse Sportive [Fagblad]. 2017-02-17.
  • Interview
    Nekså, Petter. (2017) Skisporten skal reddes med snøproduksjon. sportsbransjen.no [Internett]. 2017-01-25.
  • Interview
    Nekså, Petter. (2017) Will future skiers rely on heat pumps?. CoolingPost [Fagblad]. 2017-02-15.
  • Lecture
    Nekså, Petter; Berstad, David Olsson. (2017) Hyper, potential for large scale hydrogen production for export from Norway. Japan-Norway Hydrogen seminar “Collaboration within hydrogen future market and value chain” . Norges forskningsråd, Innovasjon Norge, Norges amb. i Japan; Tokyo. 2017-02-28 - 2017-02-28.
  • Lecture
    Nekså, Petter; Berstad, David Olsson; Størset, Sigmund Østtveit. (2017) Large scale hydrogen production from natural gas in Norway - a possibility for sustainable value creation based on Norwegian energy resources. Smart Gas 2017 . Tekna; Oslo. 2017-05-10 - 2017-05-11.
  • Lecture
    Nekså, Petter; Fosso, Olav B. (2017) Strategic Research Area 2014-2023 NTNU ENERGY. Norway-Japan KIFEE-9, Symposium 2017 . KIFEE, Doshisha University; Kyoto. 2017-03-07 - 2017-03-10.
  • Lecture
    Nekså, Petter; Hemmingsen, Anne Karin Torstveit. (2017) FME HighEFF-Centre for an Energy Efficient and Competitive Industry for the Future –aktivitet relatert til norsk kjølebransje. Norsk Kjøleteknisk Møte 2017 . Norsk Kjøleteknisk Forening - Tekna; Trondheim. 2017-04-20 - 2017-04-21.
  • Lecture
    Nekså, Petter; Hemmingsen, Anne Karin Torstveit. (2017) HighEFF-Centre for an Energy Efficient and Competitive Industry for the Future. Norway-Japan KIFEE-9 Symposium 2017 . KIFEE, Doshisha University; Kyoto. 2017-03-07 - 2017-03-10.
  • Interview
    Nekså, Petter; Røkke, Nils Anders. (2017) Klimaændringer truer Norges nationalsport: Nu vil nordmændene opfinde ’grøn’ kunstsne. DR.dk [Internett]. 2017-01-19.
  • Interview
    Nekså, Petter; Stang, Hans Georg Jacob. (2017) Norwegian eco snow machines secure the future of skiing. Climateaction.org [Internett]. 2017-02-13.
  • Interview
    Nekså, Petter; Stang, Jacob H; Eikevik, Trygve Magne. (2017) A future for skiing in a warmer world. geminiresearchnews.com [Tidsskrift]. 2017-02-02.
  • Interview
    Røkke, Nils Anders; Nekså, Petter. (2017) Skal redde skisporten – i plussgrader. abc nyheter [Internett]. 2017-01-19.
  • Academic lecture
    Wilhelmsen, Øivind; Skaugen, Geir; Berstad, David Olsson; Aasen, Ailo; Nekså, Petter. (2017) Understanding the physical phenomena that occur inside heat exchangers for liquefaction of hydrogen. 14th CRYOGENICS 2017 IIR International Conference . IIR; Dresden. 2017-05-15 - 2017-05-19.

2016

  • Interview
    Bantle, Michael; Nekså, Petter; Benjaminsen, Christina. (2016) Gjør gull av spillvarme. Kule og Varmepumper [Fagblad]. 2016-04-01.
  • Lecture
    Berstad, David Olsson; Nekså, Petter. (2016) Liquefied hydrogen production from surplus wind/hydro power and fossil sources in Norway. Hydrogenkonferanse Sogn og Fjordane 2016 . Maritim Forening Sogn og Fjordane m.fl.; Florø. 2016-10-19 - 2016-10-20.
  • Academic lecture
    Berstad, David Olsson; Nekså, Petter; Voldsund, Mari; Wilhelmsen, Øivind; Korpås, Magnus. (2016) Liquefied Hydrogen Production and Export in Norway. 4th Trondheim Gas Technology Conference . The Gas Technology Centre NTNU-SINTEF; Trondheim. 2016-12-05 - 2016-12-05.
  • Academic lecture
    Berstad, David Olsson; Roussanaly, Simon; Anantharaman, Rahul; Nekså, Petter; Jakobsen, Jana Poplsteinova. (2016) Techno-economic evaluation of a low-temperature CO2 capture unit for IGCC Plants. 22nd International Congress of Chemical and Process Engineering ; 2016-08-27 - 2016-08-31.
  • Academic lecture
    Berstad, David Olsson; Roussanaly, Simon; Anantharaman, Rahul; Nekså, Petter; Jakobsen, Jana Poplsteinova. (2016) Techno-economic evaluation of a low-temperature CO2 capture unit for IGCC Plants. 8th International Freiberg Conference on IGCC & XtL Technologies ; 2016-06-12 - 2016-06-16.
  • Academic lecture
    Clos, Daniel Perez; Nekså, Petter; Johnsen, Sverre Gullikstad; Aune, Ragnhild Elizabeth. (2016) PhD Heat recovery from Al pot gas and scaling issues. SFI høst møte 2016 ; 2016-10-25 - 2016-10-26.
  • Academic lecture
    Nekså, Petter. (2016) CO2 in the Commercial Refrigeration Sector, Including High Ambient Temperatures. MOP 28 Kigali, Side event: Opportunities for A5 Countries to Leapfrog to Long-Term Sustainable Alternatives Based on Natural Refrigerants . Joint Indo-Norwegian arranged side-event; Kigali. 2016-10-13 - 2016-10-13.
  • Lecture
    Nekså, Petter. (2016) HighEFF Work Plans. FME HighEFF Kick-off . SINTEF Energy Research; Gardermoen. 2016-11-28 - 2016-11-28.
  • Lecture
    Nekså, Petter. (2016) HighEFF, energiforskning for industriell, grønn konkurransekraft. Industri 2016 . Norsk Industri; Bodø. 2016-09-28 - 2016-09-29.
  • Interview
    Nekså, Petter. (2016) Hydrogenvei til Japan. Energi og Klima.no [Internett]. 2016-06-14.
  • Interview
    Nekså, Petter. (2016) NEL ASA starts feasibility study for large-scale hydrogen production in Norway. CTBR Energy Management Transport Sustainability [Internett]. 2016-04-05.
  • Interview
    Nekså, Petter. (2016) NEL announces initiation of feasibility partner study for large-scale hydrogen production in Norway. Bloomberg [Internett]. 2016-04-15.
  • Interview
    Nekså, Petter. (2016) Nel Asa Initiates Feasibility Study for Hydrogen Export. Process wordwide [Fagblad]. 2016-04-20.
  • Interview
    Nekså, Petter. (2016) Nå kan Norge få storstilt produksjon av hydrogen. sysla grønn [Fagblad]. 2016-04-14.
  • Interview
    Nekså, Petter; Hemmingsen, Anne Karin Torstveit. (2016) - La naturens egne stoffer overta som kjølegasser. ITBAktuelt [Internett]. 2016-10-28.
  • Interview
    Nekså, Petter; Hemmingsen, Anne Karin Torstveit. (2016) CO2 gir grønn kjøling. GEMINI [Fagblad]. 2016-10-21.

2015

  • Interview
    Benjaminsen, Christina; Bantle, Michael; Nekså, Petter. (2015) Gjør gull av spillvarme. byggfakta.no [Internett]. 2015-07-09.
  • Interview
    Benjaminsen, Christina; Bantle, Michael; Nekså, Petter. (2015) Gjør gull av spillvarme. petro.no [Internett]. 2015-07-07.
  • Interview
    Bergh, Nicholas; Løfaldi, Reidar; Nekså, Petter. (2015) Norske klimaeksperter skal redde skisporten. Aftenposten side 19-20 [Avis]. 2015-03-05.
  • Lecture
    Berstad, David Olsson; Roussanaly, Simon; Skaugen, Geir; Anantharaman, Rahul; Nekså, Petter; Jordal, Kristin; Jakobsen, Jana Poplsteinova. (2015) Energy and cost evaluation of a low-temperature CO2 capture unit for IGCC plants. Pittsburgh Coal Conference . University Of Pittsburgh; Pittsburgh. 2015-10-05 - 2015-10-08.
  • Academic lecture
    Jin, Zhequan; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin. (2015) Investigation on CO2 ground-coupled heat pumping system for buildings under cold climate. Proceedings of 8th International Cold Climate HVAC Conference ; 2015-10-20 - 2015-10-23.
  • Lecture
    Nekså, Petter. (2015) Conversion of surplus heat in industry. Japan-Norway Energy Science Week 2015 . Norwegian Embassy, The Research Council of Norway, SIU, IN; Tokyo Int Exchange Center. 2015-05-27 - 2015-05-28.
  • Lecture
    Nekså, Petter. (2015) Non-HFC refrigerants in small and medium-sized air-conditioning and heat pump systems. Workshop on Management of HFCs: Technical Issues . UNEP; Bangkok. 2015-04-20 - 2015-04-21.
  • Lecture
    Nekså, Petter. (2015) Sites and concepts for possible hydrogen production and export from Norway. Japan-Norway Energy Science Week 2015 . Norwegian Embassy, Research Council of Norway, SIU, IN; Tokyo Int Exchange Center. 2015-05-27 - 2015-05-28.

2014

  • Academic lecture
    Berstad, David Olsson; Lindqvist, Karl; Nekså, Petter; Roussanaly, Simon. (2014) Natural gas sweetening by additive-aided extractive distillation for CO2 freezing point depression. 3rd Trondheim Gas Technology Conference ; 2014-06-04 - 2014-06-05.
  • Lecture
    Berstad, David Olsson; Roussanaly, Simon; Skaugen, Geir; Anantharaman, Rahul; Nekså, Petter; Jordal, Kristin. (2014) Energy and cost evaluation of a low-temperature CO2 capture unit for IGCC plants. GHGT-12 . IEAGHG; Austin, TX. 2014-10-05 - 2014-10-09.
  • Academic lecture
    Jordal, Kristin; Anantharaman, Rahul; Peters, Thijs; Berstad, David Olsson; Morud, John Christian; Nekså, Petter; Bredesen, Rune. (2014) High‐purity H2 production with CO2 capture based on coal gasification. 27th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems ; Turku. 2014-06-15 - 2014-06-19.
  • Lecture
    Roussanaly, Simon; Anantharaman, Rahul; lindqvist, karl; Nekså, Petter. (2014) Multi-criteria analyses of two solvent and one low-temperature concepts for acid gas removal from natural gas. Trondheim Gas Technology Conference 3 . SINTEF Energy Research; Trondheim. 2014-06-04 - 2014-06-05.
  • Academic lecture
    Skaugen, Geir; Walnum, Harald Taxt; Hagen, Brede Andre Larsen; Clos, Daniel Perez; Mazzetti, Marit Jagtoyen; Nekså, Petter. (2014) DESIGN AND OPTIMIZATION OF WASTE HEAT RECOVERY UNIT USING CARBON DIOXIDE AS COOLING FLUID. ASME Power 2014 Conference . ASME; Baltimore, Maryland. 2014-07-28 - 2014-07-31.
  • Academic lecture
    Yamaguchi, Hiroshi; Iwamoto, Yuhiro; Ozaki, S; Nekså, Petter. (2014) EXPERIMENTAL OBSERVATION OF SEDIMENTATION PHENOMENA OF CO2 DRY ICE IN MODEL CHANNEL. 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014 . International Institute of Refrigeration; Hangzhou. 2014-08-31 - 2014-09-02.

2013

  • Academic lecture
    Berstad, David Olsson; Anantharaman, Rahul; Nekså, Petter. (2013) Integrated low-temperature CO2 capture from IGCC power plant by partial condensation and separation of syngas. 16th Conference Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES13) ; Rhodos. 2013-09-29 - 2013-10-02.
  • Academic lecture
    Mazzetti, Marit Jagtoyen; Nekså, Petter; Walnum, Harald Taxt; Hemmingsen, Anne Karin. (2013) Novel Energy Efficiency Technologies for Reduction of Offshore CO2 Emissions. OTC 2013 . OTC; Houston. 2013-05-06 - 2013-05-08.

2012

  • Poster
    Berstad, David Olsson; Anantharaman, Rahul; Nekså, Petter. (2012) Low-temperature CCS from an IGCC power plant and comparison with physical solvents. 11th International Conference on Greenhouse Gas Control Technologies (GHGT-11) . IEAGHG; Kyoto. 2012-11-18 - 2012-11-22.
  • Poster
    Berstad, David Olsson; Quack, Hans; Walnum, Harald Taxt; Drescher, Michael; Stang, Hans Georg Jacob; Nekså, Petter; Haberstroh, Christoph; Decker, Lutz; Michael, Börsch; Holdener, Fridolin. (2012) Design Principles for High-Efficiency Hydrogen Liquefaction Processes. World Hydrogen Energy Conference 2012 ; 2012-06-03 - 2012-06-07.
  • Academic lecture
    Hafner, Armin; Poppi, Stefano; Nekså, Petter; Eikevik, Trygve Magne; Minetto, Silvia. (2012) Development of Commersial Refrigeration Systems with Heat Recovery for Supermaket Buildings. 10th Gustav Lorentzen Conference on Natural Working Fluids . International Institute of Refrigeration; Delfts. 2012-06-24 - 2012-06-24.
  • Academic lecture
    Hafner, Armin; Schmälzle, Christian; Nekså, Petter; Obrist, Frank; Rekstad, Inge Håvard. (2012) High Efficient 100 kW(el) R744 Compressor. 10th IIR Gustav Lorentzen Conference on Natural Refrigerants . International Institute of Refigeration (IIR); Delft. 2012-06-24 - 2012-06-27.
  • Academic lecture
    Nekså, Petter; Stolzenburg, Klaus. (2012) Making Hydrogen Liquefaction more competitive: Overview of the Project and of the Supply Pathways considered. World Hydrogen Energy Conference (WHEC) ; Toronto. 2012-06-03 - 2012-06-07.
  • Academic lecture
    Quack, Hans; Essler, Jürgen; Haberstroh, Christoph; Walnum, Harald Taxt; Berstad, David Olsson; Drescher, Michael; Nekså, Petter. (2012) Search for the Best Processes to Liquefy Hydrogen in Very Large Plants. IIR Cryogenics 2012 ; Dresden. 2012-09-11 - 2012-09-14.
  • Poster
    Quack, Hans; Haberstroh, Christoph; Essler, Jürgen; Nekså, Petter; Berstad, David Olsson; Drescher, Michael; Stang, Hans Georg Jacob; Walnum, Harald Taxt; Decker, Lutz; Treite, Phillip. (2012) Boundary Conditions and assumptions Influencing the Power Needed to Liquefy Hydrogen. World Hydrogen Energy Conference 2012 ; 2012-06-03 - 2012-06-07.
  • Academic lecture
    Walnum, Harald Taxt; Berstad, David Olsson; Nekså, Petter; Drescher, Michael; Quack, Hans; Haberstroh, Christoph; Essler, Jürgen. (2012) Principles for the Liquefaction of Hydrogen with Emphasis on Precooling Processes. IIR Cryogenics 2012 ; Dresden. 2012-09-11.
  • Poster
    Walnum, Harald Taxt; Berstad, David Olsson; Nekså, Petter; Drescher, Michael; Stang, Hans Georg Jacob. (2012) Mixed Refrigerants for High Efficiency Hydrogen Pre-cooling. World Hydrogen Energy Conference 2012 ; 2012-06-03.

2011

  • Academic lecture
    Berstad, David Olsson; Nekså, Petter; Anantharaman, Rahul. (2011) CO2 capture from IGCC by low-temperature syngas separation and partial condensation of CO2. The 6th Trondheim CCS Conference . SINTEF Energi AS; Trondheim. 2011-06-14 - 2011-06-16.
  • Academic lecture
    Berstad, David Olsson; Nekså, Petter; Anantharaman, Rahul. (2011) CO2 capture from IGCC by lowtemperature syngas separation and partial condensation of CO2. 6th Trondheim CCS Conference . SINTEF Energi; Trondheim. 2011-06-14 - 2011-06-16.
  • Academic lecture
    Berstad, David Olsson; Nekså, Petter; Anantharaman, Rahul. (2011) Potential for low-temperature capture technologies in different CCS applications. The 6th Trondheim CCS Conference . SINTEF Energi AS; Trondheim. 2011-06-14 - 2011-06-16.
  • Academic lecture
    Berstad, David Olsson; Nekså, Petter; Anantharaman, Rahul. (2011) Potential for low-temperature capture technologies in different CCS applications. 6th Trondheim CCS Conference . SINTEF Energi; Trondheim. 2011-06-14 - 2011-06-16.
  • Academic lecture
    Berstad, David Olsson; Roussanaly, Simon; Nekså, Petter; Anantharaman, Rahul. (2011) Low temperature CO2 removal from natural gas. 2nd Trondheim Gas Technology Conference . The Gas Technology Centre NTNU-SINTEF; Trondheim. 2011-11-02 - 2011-11-03.
  • Academic lecture
    Berstad, David Olsson; Roussanaly, Simon; Nekså, Petter; Anantharaman, Rahul. (2011) Low-temperature CO2 removal from natural gas. 2nd Trondheim Gas Technology Conference . Gas Technology Centre NTNU-SINTEF; Trondheim. 2011-11-02 - 2011-11-03.
  • Academic lecture
    Hafner, Armin; Nekså, Petter; Ladam, Yves; Eikevik, Trygve Magne. (2011) Oil-Free R744 Systems for Industrial/Commersial Applications. The 23rd International Congress of Refrigeration . IIR International Institute of Refrigeration; Prague. 2011-08-22 - 2011-08-26.

2009

  • Academic lecture
    Berstad, David Olsson; Stang, Hans Georg Jacob; Nekså, Petter. (2009) A future energy chain based on liquefied hydrogen. Hydrogen and Fuel Cells in the Nordic Countries – 2009 . Norwegian Hydrogen Forum; Oslo. 2009-11-24 - 2009-11-26.
  • Academic lecture
    Berstad, David Olsson; Stang, Hans Georg Jacob; Nekså, Petter. (2009) A future energy chain based on liquefied hydrogen. 1st Trondheim Gas Technology Conference . Gas Technology Centre (NTNU-SINTEF); NOVA. 2009-10-21 - 2009-10-22.
  • Academic lecture
    Nekså, Petter. (2009) CREATIV - Efficient Heating and Cooling. CREATIV Research Workshop . SINTEF Energy Research; Trondheim. 2009-11-23 - 2009-11-23.
  • Academic lecture
    Nekså, Petter. (2009) Japanske husstander varmer opp vann med varmepumper - Hvilke perspektiver gir CO2 som kuldemedium?. Nordiske varmepumpedager 2009 . NOVAP og andre nordiske varmepumpeforeninger; Oslo. 2009-06-04 - 2009-06-05.
  • Academic lecture
    Nekså, Petter. (2009) Refrigeration Technology with CO2 and Other Natural Refrigerants. KIFFE Symposium 2009 . NTNU; Trondheim. 2009-09-07 - 2009-09-09.
  • Academic lecture
    Nekså, Petter; Ladam, Yves. (2009) Spillvarme - en kilde til kraftproduksjon -- Waste heat – a source for power production. Enovas Industrikonferanse 2009 . Enova SF; Trondheim. 2009-11-30 - 2009-12-01.
  • Academic lecture
    Nekså, Petter; Ladam, Yves. (2009) Strømproduksjon fra lavtemperatur spillvarme - Power production from low temperature surplus heat. Energiuka 2009 . NFR, Enova,; Oslo. 2009-02-04 - 2009-02-05.

2008

  • Academic lecture
    Hafner, Armin; Nekså, Petter. (2008) Global environmental & economic benefits of introducing R744 mobile air conditioning. MAC-Summit-Shanghai-2008 ; Shanghai. 2008-01-01 - 2008-01-02.
  • Academic lecture
    Nekså, Petter. (2008) CO2 as Refrigerant, Current and Future Applications and Basic Research Needs. EPRI Workshop to Assess Basic Science Research Needs . Electricity and Power Research Institute EPRI, USA; Charlotte, NC, USA. 2008-01-15 - 2008-01-16.
  • Academic lecture
    Nekså, Petter. (2008) Refrigeration: Perspectives, NH3 and CO2 as natural refrigerants. 2008 Refrigeration Year, AFF-IIR Centenary, 100 years at the service of the development of refrigeration and its applications . International Institute of Refrigeration; Paris, France. 2008-06-12 - 2008-06-12.

2007

  • Academic lecture
    Rekstad, Inge Håvard; Nekså, Petter (SINTEF). (2007) Smøremidler for CO2 anlegg. Kveldsmøte . Norsk Kjøleteknisk Forening; Oslo. 2007-11-01 - 2007-11-01.
  • Academic lecture
    Stene, Jørn; Jakobsen, Arne (SINTEF); Andresen, Trond; Skiple, Torgeir (SINTEF); Nekså, Petter (SINTEF). (2007) CO2 Heat Pump for Combined Heating and Cooling of Non-Residential Buildings. 22nd IIR/IIF International Congress of Refrigeration . International Institute of Refrigeration; Bejing. 2007-08-22 - 2007-08-26.
  • Academic lecture
    Eikevik, Trygve Magne; Rekstad, Håvard (NTNU); Skaugen, Geir (SINTEF); Jakobsen, Arne (SINTEF); Nekså, Petter (SINTEF). (2007) Prototype Liquid Chiller Using Carbon Dioxide as Refrigerant. 22nd International Congress of Refrigeration . China Assisiation of Refrigeration; Beijing. 2007-08-21 - 2007-08-26.
  • Academic lecture
    Hafner, Armin; Nekså, Petter. (2007) Global environmental & economic benefits of introducing R744 mobile air conditioning. 2nd International Workshop on Mobile Air Conditioning and Auxiliary Systems . ATA; Torino. 2007-10-29 - 2007-11-30.

2006

  • Academic lecture
    Hafner, Armin; Nekså, Petter. (2006) Factors influencing life cycle environmental impact calculations of MACs. MAC-Summit-Saafelden-2006 ; Saalfelden. 2006-02-15 - 2006-02-16.

2005

  • Academic lecture
    Zha, Shitong; Hafner, Armin (SINTEF); Nekså, Petter (SINTEF). (2005) Study on Transcritical R-744 (CO2) Voorhees Heat Pump Cycle. IIR International Conference on Commercial Refrigeration, Vicenza . International Institute of Refrigeration (IIR); Vicenza. 2005-08-30 - 2005-08-31.
  • Academic lecture
    Hafner, Armin; Nekså, Petter. (2005) R744 (CO2) Technology Maturity and Availability. Workshop on Technology Cooperation for Next-Generation Mobile Air Conditioning ; New Delhi. 2005-03-03 - 2005-03-05.

2004

  • Academic lecture
    Jakobsen, Arne; Skaugen, Geir; Skiple, Torgeir; Nekså, Petter; Andresen, Trond. (2004) Development and Evaluation of a Reversible CO2 Residential Air Conditioning System Compared to State-of-the-Art R410A Unit. Natural Working Fluids 2004 - 6th Gustav Lorentzen Conference . International Institute of Refrigeration; Glasgow. 2004-08-29 - 2004-09-01.
  • Academic lecture
    Nekså, Petter (SINTEF); Hoggen, Rune Lillethun; Aflekt, Kåre (NTNU); Jakobsen, Arne (SINTEF); Skaugen, Geir (SINTEF). (2004) Fan-less Heat Exchanger Concept for CO2 Heat Pump Systems. Natural Working Fluids 2004 - 6th Gustav Lorentzen Conference . International Institute of Refrigeration - IIR; Glasgow. 2004-08-29 - 2004-09-01.
  • Academic lecture
    Rekstad, Håvard; Nekså, Petter; Pisano, Giacomo; Bredesen, Arne Mathias. (2004) Measurement on a Two-Stage CO2-Compresor. Natural Working Fluids 2004 - 6th Gustav Lorentzen Conference . International Institute of Refrigeration - IIR; Glasogow. 2004-08-29 - 2004-09-01.
  • Academic lecture
    Tøndell, Espen; Bredesen, Arne Mathias; Pettersen, Jostein; Nekså, Petter. (2004) Test Facility and Concept for CO2 Expander. Natural Working Fluids 2004 - 6th Gustav Lorentzen Conference . International Institute of Refrigeration - IIR; Glasgow. 2004-08-29 - 2004-09-01.

2003

  • Academic lecture
    Nekså, Petter; Pettersen, Johan; Skaugen, Geir. (2003) CO2 refrigeration, air conditioning and heat pump technology. X Technologica Innovations in Refrigeration adn Air Conditioning, Milan, June 27-28 2003 . [Mangler data]; Milano. 2003-06-28.
  • Academic lecture
    Nekså, Petter; Pettersen, Jostein; Bredesen, Arne Mathias. (2003) Development of CO2 Refrigeration, Air Conditioning and Heat Pump Technology in Europe. International Conference on Fluid and Thermal Energy Conversion 2003 . [Mangler data]; Bali, Indonesia. 2004-12-12.
  • Academic lecture
    Pettersen, Jostein; Nekså, Petter. (2003) Consequences of the newest improvements in R-744 systems. Automotive alternate refrigerant symposium . [Mangler data]; Phoneix, AX, USA. 2003-07-17.

2002

  • Academic lecture
    Aarlien, Rune; Nekså, Petter; Pettersen, Jostein. (2002) CO2 as working fluid in heat pumping equipment. IEA Heat Pump Conference (7 : 2002 : Beijing) . [Mangler data]; Beijing. 2002-05-22.
  • Academic lecture
    Skaugen, Geir; Nekså, Petter; Pettersen, Jostein. (2002) Simulation of trans-critical vapour compression systems. IIR Gustav Lorentzen Conference on Natural Working Fluids (5 : 2002 : Guangzhou, China) . [Mangler data]; Guangzhou, China. 2002-09-20.

2000

  • Academic lecture
    Aarlien, R.; Pettersen, Jostein; Bredesen, Arne Mathias; Nekså, P.; Adriansyah, Willy. (2000) Use of Carbon Dioxide as Working Fluid - Current Status and Potentials. International Conference on Fluid and Thermal Energy Conversion 2000 (FTEC 2000) . [Mangler data]; Bandung, Indonesia, July 2-6, 2000.
  • Academic lecture
    Nekså, P.; Dorin, F.; Rekstad, Håvard; Bredesen, Arne Mathias. (2000) Development of Two-stage Semi-Hermetic CO2-Compressors". The 4th IIR Gustav Lorentzen Conference on Natural Working Fluids . [Mangler data]; Purdue, West Lafyette, USA, July 25-28 2000.
  • Academic lecture
    Strømmen, Ingvald; Bredesen, Arne Mathias; Eikevik, Trygve Magne; Nekså, Petter; Pettersen, Jostein; Aarlien, Rune. (2000) Varmepumpesystemer for et nytt århundre. Svenska kyltekniska föreningen och kylentreprenörernas förenings årsmøte. . [Mangler data]; Halmstad, Sverige, 12. mai 2000.
  • Academic lecture
    Zakeri, Reza G.; Nekså, Petter; Rekstad, Håvard; Lang-Ree, Kristian; Olsen, Torbjørn. (2000) Results and experiences with the first commercial pilot plant CO2 heat pump water heater. The 4th IIR Gustav Lorentzen Conference on Natural Working Fluids . [Mangler data]; Purdue, West Lafayette, USA, July 25-28, 2000.

1999

  • Academic lecture
    Munkejord, S.T.; Mæhlum, H.S.; Nekså, Petter; Pettersen, Jostein. (1999) Micro Technology in Heat Pumping Systems. 29th International Congress of Refrigeration, IIR/IIF . [Mangler data]; Sydney, Australia, September 1999.
  • Academic lecture
    Nekså, Petter; Dorin, Filippo; Rekstad, Håvard; Bredesen, Arne Mathias; Serbisse, Ahmed. (1999) Development of semi-hermetic CO2-compressors. 20th International Congress of Refrigeration, IIR/IIF . [Mangler data]; Sydney, Australia, September 1999.
  • Academic lecture
    Nekså, Petter; Rekstad, Håvard; Zakeri, G.R.; Schiefloe, P.A.; Svensson, M.Chr.. (1999) Heat pump water heaters with CO%c as working fluid. 6th International Energy Agency Heat Pump Conference 1999 "Heat pumps - a benefit for the environment" . [Mangler data]; Berlin, Tyskland, May 31 - June 2, 1999.
  • Academic lecture
    Nekså, Petter; Rekstad, Håvard; Zakeri, G.Reza; Schiefloe, Per Arne; Svensson, Morten Chr.. (1999) Commercial heat pumps for water heating and heat recovery. CO%c Technology in Refrigeration, Heat Pump and Air Conditioning Systems. CO%c Technology in Refrigeration, Heat pump, and Air Condition Systems . [Mangler data]; Mainz, Tyskland, 18th March, 1999.
  • Academic lecture
    Strømmen, Ingvald; Bredesen, Arne Mathias; Eikevik, Trygve Magne; Nekså, Petter; Aarlien, Rune. (1999) Heat pumping systems for the next century. 20th International Congress of Refrigeration, IIR/IIF . [Mangler data]; Sydney, Australia, September 1999.

1997

  • Academic lecture
    Bredesen, Arne Mathias; Aflekt, Kåre; Pettersen, Jostein; Hafner, Armin; Nekså, Petter; Skaugen, Geir. (1997) Studies on CO2 heat exchangers and heat transfer. IEA/IIR Workshop on CO2 Technology in Refrigeration, Air Condit ioning and Heat... . [Mangler data]; Trondheim.
  • Academic lecture
    Bredesen, Arne Mathias; Hafner, Armin; Pettersen, Jostein; Nekså, Petter; Aflekt, Kåre. (1997) Heat transfer and pressure drop for in-tube evaporation of CO%c. Heat transfer issues in natural refrigerants . [Mangler data]; University of Maryland, Washington, 6.-7. November 1997.
  • Academic lecture
    Nekså, Petter; Rekstad, Håvard; Fagerli, Bjørn E.. (1997) Norske løsninger med CO%c - praktiske resultater : CO%c-varmepumpe for tappevannsberedning. 15. Nordiske kjølemøte, 8. Nordiske varmepumpedager . [Mangler data]; Reykjavik (1997-06-19/22).
  • Academic lecture
    Pettersen, Jostein; Aarlien, Rune; Nekså, Petter; Skaugen, Geir; Aflekt, Kåre (NTNU). (1997) A comparative evaluation of CO2 and HCFC-22 residential air-conditioning systems in a Japanese climate. 15. nordiske kölemödet, 8. nordiske varmepumpedagene . KTI; Reykjavik. 1997-06-18 - 1997-06-21.

1996

  • Academic lecture
    Aarlien, Rune; Pettersen, Jostein; Skaugen, Geir; Nekså, Petter. (1996) Residential air conditioning with CO2 - Perliminary results. Applications for natural reprigerants . IIR/IIF; Aarhus. 1996-09-03 - 1996-09-06.

1995

  • Academic lecture
    Pettersen, Jostein; Nekså, Petter; Nesje, Odd M.; Schiefloe, Per Arne; Rekstad, Inge Håvard. (1995) Recent advances in CO2 refrigeration. 19th International Congress of Refrigeration . [Mangler data]; [Mangler data].

1994

  • Academic lecture
    Nekså, Petter. (1994) Trans-critical vapour compression heat pumps. New Applications of Natural Working Fluids in Refrigeration and Air Conditioning . [Mangler data]; [Mangler data].
NTNU
Studies
  • Master's programmes in English
  • For exchange students
  • PhD opportunities
  • Courses
  • Career development
  • Continuing education
  • Application process
Contact
  • Contact NTNU
  • Employees
  • For alumni
  • Press contacts
  • Researcher support
Discover NTNU
  • Experts
  • Vacancies
  • Pictures from NTNU
  • Innovation resources
  • NTNU in Gjøvik
  • NTNU in Trondheim
  • NTNU in Ålesund
  • Maps
About NTNU
  • NTNU's strategy
  • Research excellence
  • Strategic research areas
  • Organizational chart
  • Libraries
  • About the university
Services
  • For employees
  • For students
  • Blackboard
  • Intranet

Norwegian University of Science and Technology

Use of cookies
Accessibility statement (in Norwegian)
Privacy policy
Editoral responsibility
Sign In