2023

• Widell, Kristina Marianne Norne; Hafner, Armin; Pachai, Alexander C.; Minetto, Silvia; Evans, Judith; Svendsen, Eirik Starheim. (2023) Training seminar: clean cooling and heating solutions. Kulde og varmepumper
  Article in business/trade/industry journal
• Torp Dahl, Cecilie; Hafner, Armin; Ren, Shuai. (2023) Utilization of surplus heat from the organic dairy at Røros. NTNU
  Masters thesis
• Köster, Lukas; Hafner, Armin; Hazarika, Mihir Mouchum. (2023) Application of a Novel Two-Stage Evaporator in Air-Conditioning Applications. NTNU
  Masters thesis
• Neakakhtar, Faraz; Hafner, Armin. (2023) Development of Concentration Processes to Conserve Rest Raw Materials and Process Water in onshore and off-shore Sectors for Circular Economy. NTNU
  Masters thesis
• Bø, Marthine; Hafner, Armin; Selvnes, Håkon. (2023) Fossilfri oppvarming av kyllingfjøs. NTNU
  Masters thesis
• Thapa, Saroj; Hafner, Armin; Selvnes, Håkon. (2023) Development of a fossil-free heating system for chicken barns based on heat pumps and thermal storage. NTNU
  Masters thesis
• Bless, Marco; Hafner, Armin; Selvnes, Håkon. (2023) Model-Based Investigation of Upgraded Thermal Energy System Designs of the Organic Dairy in Røros. NTNU
  Masters thesis
• Clement, Sarah; Hafner, Armin. (2023) Cold thermal energy storage for district cooling. NTNU
  Report
• Pardiñas, Ángel Á.; Selvnes, Håkon; Banasiak, Krzysztof; Hafner, Armin. (2023) Next generation of ejector-supported R744 booster systems for commercial refrigeration at all climates. International journal of refrigeration
  Academic article
• Pardiñas, Ángel Á.; Kauko, Hanne Laura Pauliina; Hazarika, Mihir Mouchum; Selvnes, Håkon; Banasiak, Krzysztof; Hafner, Armin. (2023) Two-stage evaporator for R744 heat pumps using greywater as heat source. Energy and Buildings
  Academic article
• Piesch, Nina; Niroomand, Reza; Hafner, Armin; Banasiak, Krzysztof; Ayad, Fadil. (2023) R744 heat pump solutions for electric vehicles. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Ren, Shuai; Ahrens, Marcel Ulrich; Hamid, Khalid; Tolstorebrov, Ignat; Hafner, Armin; Eikevik, Trygve Magne. (2023) PERFORMANCE MODELLING OF AMMONIA-WATER ABSORPTION-COMPRESSION HEAT PUMP FOR STEAM GENERATION IN FOOD PROCESSING . International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hazarika, Mihir Mouchum; Hafner, Armin; Bengsch, Jan. (2023) A comparative study to investigate two configurations of a two-stage evaporator in a CO2 heat pump chiller. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin. (2023) Smart CO2 refrigeration and heat pumping systems. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Söylemez, Engin; ERB, Kevin; Schubert, Maike; Gerber, Raphael; Carbonell, Daniel; Hazarika, Mihir Mouchum. (2023) Performance analysis of a CO2-ice heat pump. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hamid, Khalid; Sajjad, Uzair; Ahrens, Marcel Ulrich; Ren, Shuai; Palanichamy, Ganesan; Tolstorebrov, Ignat. (2023) Potential evaluation of integrated high temperature heat pumps: A review of recent advances. Applied Thermal Engineering
  Academic article
• Selvnes, Håkon; Alvarez Pardinas, Angel; Hafner, Armin. (2023) Cold thermal energy storage for air conditioning in a supermarket CO2 booster refrigeration system. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Laguri, Vinod; Kumar, Kundan; Gupta, Pradeep; Kumar, Pramod; Mv, Srisha Rao; Hafner, Armin. (2023) Thermodynamic analysis of a multi-evaporator refrigeration cycle using a two-phase ejector as an expansion device. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Log, Alexandra Metallinou; Hammer, Morten; Deng, Han; Austegard, Anders; Hafner, Armin; Munkejord, Svend Tollak. (2023) Depressurization of in a pipe: Effect of initial state on non-equilibrium two-phase flow. International Journal of Multiphase Flow
  Academic article
• Svendsen, Eirik Starheim; Bengsch, Jan; Widell, Kristina Marianne Norne; Selvnes, Håkon; Sevault, Alexis Gerard Edouard; Hafner, Armin. (2023) Integration of Cold Thermal Energy Storage at a Pelagic Fish Processing Plant: A Modelling Approach. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Sherman, Prem Kumar; Tolstorebrov, Ignat; Widell, Kristina Marianne Norne; Hafner, Armin. (2023) Sustainable production of fish protein hydrolysates: overall system architecture and footprint. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Widell, Kristina Marianne Norne; Gabrielii, Cecilia H; Söylemez, Engin; Hazarika, Mihir Mouchum; Hafner, Armin; Khan, Muhammad Umar. (2023) Energy efficient and climate friendly refrigeration systems onboard fishing vessels. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Arun, B.S.; Kumar, Sumit; Ninan, George; Samuel, Manoj P.; Widell, Kristina Marianne Norne; Singh, Simarpreet. (2023) Study on retaining natural refrigerant in seafood processing industries in India. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Ren, Shuai; Ahrens, Marcel Ulrich; Hamid, Khalid; Hafner, Armin; Tolstorebrov, Ignat; Eikevik, Trygve Magne. (2023) Numerical investigation of an ammonia-water absorption-compression high-temperature heat pump for hot water and steam production in food processing. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Selvnes, Håkon; Jenssen, Sigmund; Bengsch, Jan; Sevault, Alexis Gerard Edouard; Widell, Kristina Marianne Norne; Ahrens, Marcel Ulrich. (2023) Integrated CO2 refrigeration and heat pump system for a dairy plant: Energy analysis and potential for cold thermal energy storage. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Saeed, Muhammad Zahid; Contiero, Luca; Blust, Stefanie; Allouche, Yosr; Hafner, Armin; Eikevik, Trygve Magne. (2023) Ultra-Low-Temperature Refrigeration Systems: A Review and Performance Comparison of Refrigerants and Configurations. Energies
  Academic literature review
• Konovalov, Dmytro; Tolstorebrov, Ignat; Eikevik, Trygve Magne; Kobalava, Halina; Radchenko, Mykola; Hafner, Armin. (2023) Recent Developments in Cooling Systems and Cooling Management for Electric Motors. Energies
  Academic literature review
• Guruchethan, A.M.; Reddy, Y.Siva Kumar; Maiya, M.P.; Hafner, Armin. (2023) Performance evaluation of absorption cooling assisted transcritical CO<inf>2</inf> refrigeration systems. International journal of refrigeration
  Academic article
• Guruchethan, A.M.; Sharma, Vishaldeep; Maiya, M.P.; Hafner, Armin. (2023) Performance evaluation of transcritical CO<inf>2</inf> refrigeration system for simultaneous heating and cooling applications. Sādhanā (Bangalore)
  Academic article
• Bengsch, Jan; Hazarika, Mihir Mouchum; Hafner, Armin; Widell, Kristina Marianne Norne. (2023) Investigation and analysis of a CO2 heat pump chiller with novel two-stage evaporator. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• S, Vaishak; Singha, Prosenjit; Dasgupta, Mani Sankar; Hafner, Armin; Widell, Kristina Marianne Norne; Bhattacharyya, Souvik. (2023) Performance analysis of a CO<inf>2</inf>/NH<inf>3</inf> cascade refrigeration system with subcooling for low temperature freezing applications. International journal of refrigeration
  Academic article
• Mastani Joybari, Mahmood; Selvnes, Håkon; Sevault, Alexis Gerard Edouard; Hafner, Armin. (2023) Numerical simulation of solid-liquid transition of carbon dioxide in pillow plate heat exchangers. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Singha, Prosenjit; Vaishak, S; Dasgupta, Mani Sankar; Bhattacharyya, Souvik; Hafner, Armin; Elarga, Hagar Hassan Hassanein Hassan. (2023) Performance analysis of a CO2 based milk chiller with evaporative cooling arrangement operating in hot climate. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Gupta, Pradeep; Kumar, Pramod; Elarga, Hagar Hassan Hassanein Hassan; Hafner, Armin. (2023) Refrigerated Transportation and Cold-chain Logistics in India – Current Status and Future Prospects. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Henke, Leon Hendrik; Elarga, Hagar Hassan Hassanein Hassan; Hafner, Armin. (2023) Numerical simulation of an integrated CO2/chiller and thermal storage system for a hotel in tropical weather conditions. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Elarga, Hagar Hassan Hassanein Hassan; Pardiñas, Ángel Á.; Minetto, Silvia; Hafner, Armin. (2023) Innovative reheat approach of the TES system during the hotel’s standstill operation utilizing a CO2 heat pump/chiller unit. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Singh, Simarpreet; Hafner, Armin; Elarga, Hagar Hassan Hassanein Hassan; Sharma, Kumodak. (2023) Integrated R744 Heat Pump/chiller for Hotel: State-of-the-Art Implementation. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Reddy, Y. Siva Kumar; Elarga, Hagar Hassan Hassanein Hassan; Gururchethan, A.M.; Maiya, M.P.; Hafner, Armin. (2023) Advantage of CO2 heat pump chiller for the application in Indian hotels. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Fabris, Francesco; Pardiñas, Ángel Á.; Marinetti, Sergio; Rossetti, Antonio; Hafner, Armin; Minetto, Silvia. (2023) A novel R744 multi-temperature cycle for refrigerated transport applications with low-temperature ejector: Experimental ejector characterization and thermodynamic cycle assessment. International journal of refrigeration
  Academic article

2022

• Skogseth, Herman; Støvneng, Jon Andreas; Gabrielii, Cecilia H; Hafner, Armin. (2022) Temporary zero emission operation on cruise ships. NTNU
  Masters thesis
• Egerdahl, Magnus; Saeed, Muhammad Zahid; Hafner, Armin. (2022) Integrated thermal system for hydrogen and ammonia driven cruise ship. NTNU
  Masters thesis
• Andersen, Henrik; Saeed, Muhammad Zahid; Hafner, Armin. (2022) Development of CO2 refrigeration systems and thermal energy storage for cruise ships. NTNU
  Masters thesis
• Kruse, Madita; Hafner, Armin. (2022) Test Report Propane-Butane HTHP – Investigation of a high temperature cascade heat pump as an energy-efficient solution for generating process heat. NTNU
  Masters thesis
• Selvnes, Håkon; Allouche, Yosr; Hafner, Armin; Schlemminger, Christian; Tolstorebrov, Ignat. (2022) Cold thermal energy storage for industrial CO<inf>2</inf> refrigeration systems using phase change material: An experimental study. Applied Thermal Engineering
  Academic article
• Söylemez, Engin; Widell, Kristina Norne; Gabrielii, Cecilia H; Ladam, Yves; Lund, Thomas; Hafner, Armin. (2022) Overview of the development and status of carbon dioxide (R-744) refrigeration systems onboard fishing vessels. International journal of refrigeration
  Academic article
• Mastani Joybari, Mahmood; Selvnes, Håkon; Sevault, Alexis; Hafner, Armin. (2022) Potentials and challenges for pillow-plate heat exchangers: State-of-the-art review. Applied Thermal Engineering
  Academic article
• Söylemez, Engin; Hafner, Armin; Schlemminger, Christian; Kriezi, Ekaterini E.; Khorshidi, Vahid. (2022) The Performance Analysis of an Integrated CO2 Refrigeration System with Multi-Ejectors Installed in a Supermarket. Energies
  Academic article
• Elarga, Hagar; Hafner, Armin. (2022) CO2 heat pump/chiller system for a hotel in a tropical climate: a numerical investigation. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Mastani Joybari, Mahmood; Selvnes, Håkon; Vingelsgård, Erling; Sevault, Alexis; Hafner, Armin. (2022) Parametric study of low-temperature thermal energy storage using carbon dioxide as the phase change material in pillow plate heat exchangers. Applied Thermal Engineering
  Academic article
• Elarga, Hagar; Selvnes, Håkon; Sevault, Alexis; Hafner, Armin. (2022) Numerical investigation of a CO2 cooling system connected to Spawn-of-energy-plus thermal zones. Applied Thermal Engineering
  Academic article
• Ringstad, Knut Emil; Banasiak, Krzysztof; Ervik, Åsmund; Hafner, Armin. (2022) Swirl-Bypass Nozzle for CO2 Two-Phase Ejectors: Numerical Design Exploration. Energies
  Academic article
• Selvnes, Håkon; Jenssen, Sigmund; Sevault, Alexis; Widell, Kristina Norne; Ahrens, Marcel Ulrich; Ren, Shuai. (2022) Integrated CO2 refrigeration and heat pump systems for dairies. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Pardiñas, Ángel Á.; Fabris, F; Contiero, Luca; Selvnes, Håkon; Banasiak, Krzysztof; Hafner, Armin. (2022) Ejector for the world: simplified ejector-supported CO2 refrigeration systems for all climates. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Saeed, Muhammad Zahid; Hafner, Armin; Thatte, Azam; Gabrielii, Cecilia H. (2022) Simultaneous implementation of rotary pressure exchanger and ejectors for CO2 refrigeration system. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Ahrens, Marcel Ulrich; Brækken, August; Foslie, Sverre Stefanussen; Moen, Ole Marius; Lovas, Kim Andre; Bantle, Michael. (2022) Performance analysis of high temperature heat pumps and thermal energy storages for a dairy. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Ahrens, Marcel Ulrich; Tønsberg, Even Kristian; Tolstorebrov, Ignat; Hafner, Armin; Eikevik, Trygve Magne. (2022) Modeling and simulation of oil-free liquid-injected screw compressors using ammonia-water mixture as working fluid. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Ahrens, Marcel Ulrich; Tolstorebrov, Ignat; Tønsberg, Even Kristian; Hafner, Armin; Wang, Ruzhu; Eikevik, Trygve Magne. (2022) Numerical investigation of an oil-free liquid-injected screw compressor with ammonia-water as refrigerant for high temperature heat pump applications. Applied Thermal Engineering
  Academic article
• Blust, Stefanie; Barroca, Pierre; Petagna, Paolo; Hanf, Pierre; Hafner, Armin. (2022) R744 modular refrigeration technology at -50℃. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Contiero, Luca; Barroca, Pierre; Hafner, Armin; Verlaat, B; Petagna, Paolo; Banasiak, Krzysztof. (2022) Krypton, applied as refrigerant for cooling of silicon detector trackers. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Wilhelmsen, Øivind; Aasen, Ailo; Banasiak, Krzysztof; Herlyng, Halvor; Hafner, Armin. (2022) One-dimensional mathematical modeling of two-phase ejectors: Extension to mixtures and mapping of the local exergy destruction. Applied Thermal Engineering
  Academic article
• Ye, Zuliang; Zendehboudi, Alireza; Hafner, Armin; Cao, Feng. (2022) General heat transfer correlations for supercritical carbon dioxide heated in vertical tubes for upward and downward flows. International journal of refrigeration
  Academic article
• Contiero, Luca; Fabris, F; Pardiñas, Ángel Á.; Hafner, Armin. (2022) Performance improvements of supermarket R744 systems by pivoting compressor arrangements. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Singh, Simarpreet; Selvnes, Håkon; Pardiñas, Ángel Á.; Reddy, Srinevas K; Gupta, P; Vaishak, S. (2022) Advanced R744 solution for supermarkets, hotel chillers and maritime applications in India. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Widell, Kristina Norne; Svendsen, Eirik Starheim; Selvnes, Håkon; Sevault, Alexis; Hafner, Armin; Nordtvedt, Tom Ståle. (2022) Energy flow analysis of an industrial ammonia refrigeration system and potential for a cold thermal energy storage. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Mastani Joybari, Mahmood; Selvnes, Håkon; Sevault, Alexis; Hafner, Armin. (2022) Cold thermal energy storage in solid-liquid transition of carbon dioxide: Investigating the possibility. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Fabris, F; Pardiñas, Ángel Á.; Marinetti, Sergio; Rossetti, Antonio; Hafner, Armin; Minetto, Silvia. (2022) Experimental evaluation of the performance of an ejector for a single compression multi-temperature CO2 refrigeration unit. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Pachai, Alexander C.; Hafner, Armin; Ciconkov, Risto. (2022) Application of natural refrigerants in the industrial refrigeration and heat pumps in the future. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Guruchethan, A.M.; Maiya, M.P.; Hafner, Armin. (2022) Effect of subcooling using expander-compressor unit in transcritical CO2. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Ebel, Tom; Zendehboudi, Alireza; Hafner, Armin; Sanchez, Dani C.. (2022) Performance investigation of an ejector-assisted transcritical CO2 heat pump with brazed plate tri-partite gas cooler for space heating and hot water production. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Ren, Shuai; Ahrens, Marcel Ulrich; Hafner, Armin; Widell, Kristina Norne. (2022) Performance evaluation of high-temperature heat pump systems for hot water and steam generation in food processing. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Abdin, Mohammad; Mehyar, Yousef; Abdin, Nour; Abdin, Firas; Hafner, Armin. (2022) Natural Working Fluids in Retail Applications in Jordan & MENA Region. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Log, Alexandra Metallinou; Munkejord, Svend Tollak; Hammer, Morten; Hafner, Armin; Deng, Han; Austegard, Anders. (2022) Investigation of non-equilibrium effects during the depressurization of carbon dioxide. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hazarika, Mihir Mouchum; Bengsch, Jan; Hafsås, Johan; Hafner, Armin; Svendsen, Eirik Starheim; Ye, Zuliang. (2022) Integration of gravity-fed evaporators in CO2 based heat-pump chillers. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin; Hazarika, Mihir Mouchum; Lechi, Federico; Zorzin, Alvaro; Pardiñas, Ángel Á.; Banasiak, Krzysztof. (2022) Experimental investigation on integrated two-stage evaporators for CO2 heat-pump chillers. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Khan, Muhammad Umar; Tolstorebrov, Ignat; Widell, Kristina Norne; Hafner, Armin; Nordtvedt, Tom Ståle. (2022) Modelling of Crystallization During Freeze-Concentration of Hydrolysates. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Sherman, Prem Kumar; Tolstorebrov, Ignat; Widell, Kristina Norne; Hafner, Armin; Nordtvedt, Tom Ståle. (2022) Application Of Refrigeration Technologies For Energy Efficient Production Of Fish Protein Hydrolysates. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Bengsch, Jan; Hafner, Armin; Hazarika, Mihir Mouchum. (2022) Investigation and analysis of a CO2 heat pump chiller with novel two-stage evaporator. NTNU
  Masters thesis
• Sherman, Prem Kumar; Hafner, Armin. (2022) SUSTAINABLE PRODUCTION OF FISH PROTEIN HYDROLYSATES: OVERALL SYSTEM ARCHITECTURE AND FOOTPRINT. NTNU
  Masters thesis
• Khan, Muhammad Umar; Hafner, Armin. (2022) Design and analysis of freeze concentrator for processing of fish protein hydrolysates. NTNU
  Masters thesis
• Leth-Olsen, Jomar Mandal; Hafner, Armin. (2022) Design of refrigeration system for freeze-concentration of fish protein hydrolysates using CO2 as working fluid. NTNU
  Masters thesis
• Svendsen, Eirik Starheim; Rotan, Magnus; Widell, Kristina Marianne Norne; Hafner, Armin; Gabrielii, Cecilia H. (2022) Maritime Refrigeration Technology Hub (maritimereftechhub.no).
  Website (informational material)
• Ruppert, Matthias; Hafner, Armin; Saeed, Muhammad Zahid. (2022) Integration of experimental setup for the experimental investigation of CO2 chiller with expander versus ejector. NTNU
  Report

2021

• Schlemminger, Christian; Ahrens, Marcel Ulrich; Foslie, Sverre Stefanussen; Moen, Ole Marius; Bantle, Michael; Hafner, Armin. (2021) Höchtemperatur-Wärmepumpen mit natürlichen Kältemitteln : Fallstudien zur HTWP-Integration für industrielle Kälte- und Prozessheisswasserherstellung. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Schaan, Larissa; Hafner, Armin; Schlemminger, Christian. (2021) Design and Evaluation of CO2 based integrated heating and cooling systems for zero emission cruise ships . NTNU
  Masters thesis
• Saeed, Muhammad Zahid; Hafner, Armin; Gabrielii, Cecilia H; Tolstorebrov, Ignat; Widell, Kristina Norne. (2021) CO2 refrigeration system design and optimization for LNG driven cruise ships. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Elbarghthi, Anas F.A.; Hafner, Armin; Banasiak, Krzysztof; Dvorak, Vaclav. (2021) An experimental study of an ejector-boosted transcritical R744 refrigeration system including an exergy analysis. Energy Conversion and Management
  Academic article
• Elbarghthi, Anas F.A.; Dvorak, Vaclav; Hafner, Armin; Banasiak, Krzysztof. (2021) The potential impact of the small-scale ejector on the R744 transcritical refrigeration system. Energy Conversion and Management
  Academic article
• Allymehr, Ehsan; Eikevik, Trygve Magne; Hafner, Armin. (2021) Investigation of Hydrocarbon Two-phase Flow for Charge Reduced Heat Exchangers. NTNU
  Doctoral dissertation
• Smitt, Silje Marie; Pardiñas, Ángel Á.; Hafner, Armin. (2021) Evaluation of Integrated Concepts with CO2 for Heating, Cooling and Hot Water Production. Energies
  Academic article
• Allymehr, Ehsan; Pardiñas, Ángel Á.; Eikevik, Trygve Magne; Hafner, Armin. (2021) Condensation of hydrocarbons in compact smooth and microfinned tubes. Energies
  Academic article
• Ahrens, Marcel Ulrich; Tønsberg, Even Kristian; Tolstorebrov, Ignat; Hafner, Armin; Eikevik, Trygve Magne. (2021) Modelling Approach for a Liquid-Injected Ammonia-Water Screw Compressor. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Khorshidi, Vahid; Kriezi, Ekaterini E.; Schlemminger, Christian; Hafner, Armin; Söylemez, Engin. (2021) Performance of integrated R744-packs part 1: compressor mass flow estimation based on data-driven models using analytical methods and actual field measurements. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Zendehboudi, Alireza; Ye, Zuliang; Hafner, Armin; Andresen, Trond; Skaugen, Geir. (2021) Heat transfer and pressure drop of supercritical CO2 in brazed plate heat exchangers of the tri-partite gas cooler. International Journal of Heat and Mass Transfer
  Academic article
• Ringstad, Knut Emil; Hafner, Armin. (2021) Comparative study of R744 ejector CFD models. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Khorshidi, Vahid; Kriezi, Ekaterini E.; Schlemminger, Christian; Hafner, Armin. (2021) Performance of integrated R744-packs Part 2 - Ejectors performance, a comparison of data-driven model from onsite measurements with rom model predictions. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Allymehr, Ehsan; Skaugen, Geir; Will, Torsten; Pardiñas, Ángel Á.; Eikevik, Trygve Magne; Hafner, Armin. (2021) Numerical Study of Hydrocarbon Charge Reduction Methods in HVAC Heat Exchangers. Energies
  Academic article
• Ahrens, Marcel Ulrich; Loth, Maximilian; Tolstorebrov, Ignat; Hafner, Armin; Kabelac, Stephan; Wang, Ruzhu. (2021) Identification of Existing Challenges and Future Trends for the Utilization of Ammonia-Water Absorption–Compression Heat Pumps at High Temperature Operation. Applied Sciences
  Academic literature review
• Selvnes, Håkon; Allouche, Yosr; Hafner, Armin. (2021) Experimental characterisation of a cold thermal energy storage unit with a pillow-plate heat exchanger design. Applied Thermal Engineering
  Academic article
• Selvnes, Håkon; Allouche, Yosr; Hafner, Armin. (2021) A cold thermal energy storage unit for CO2 refrigeration using phase change material: First experimental results. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Ringstad, Knut Emil; Banasiak, Krzysztof; Ervik, Åsmund; Hafner, Armin. (2021) Machine learning and CFD for mapping and optimization of CO2 ejectors. Applied Thermal Engineering
  Academic article
• Ringstad, Knut Emil; Banasiak, Krzysztof; Hafner, Armin. (2021) CFD-based design algorithm for CO2 ejectors. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Pachai, Alexander C.; Normann, Jeannett; Arpagaus, Cordin; Hafner, Armin. (2021) Screening of Future-Proof Working Fluids for Industrial High-Temperature Heat Pumps up to 250 °C (Part II). International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Semaev, Pavel; Söylemez, Engin; Tolstorebrov, Ignat; Hafner, Armin; Widell, Kristina Norne; Lund, Thomas. (2021) Simulation of a carbon dioxide (R-744) refrigeration system for fishing vessel. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Ahrens, Marcel Ulrich; Selvnes, Håkon; Henke, Leon Hendrik; Bantle, Michael; Hafner, Armin. (2021) Investigation on heat recovery strategies from low temperature food processing plants: Energy analysis and system comparison. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Pachai, Alexander C.; Normann, Jeannett; Arpagaus, Cordin; Hafner, Armin. (2021) Screening of Future-Proof Working Fluids for Industrial High-Temperature Heat Pumps up to 250 °C (Part I). International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Contiero, Luca; Hafner, Armin; Pardiñas, Ángel Á.. (2021) Multi Ejector and pivoting-supported R744 application with AC for supermarkets. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Singh, Simarpreet; Pardiñas, Ángel Á.; Hafner, Armin; Schlemminger, Christian; Banasiak, Krzysztof. (2021) R744 Refrigeration Solution for Small Supermarkets. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin; Ciconkov, Risto. (2021) Current state and market trends in technologies with natural refrigerants. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Barroca, Pierre; Verlaat, B; Hafner, Armin; Blust, Stefanie; Hulek, Wojciech; Zwalinski, L. (2021) Safety and reliability assessment of CO2 refrigeration system for underground applications below -50 °C. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Pardiñas, Ángel Á.; Jokiel, Michael; Schlemminger, Christian; Selvnes, Håkon; Hafner, Armin. (2021) Modeling of a CO2‐based integrated refrigeration system for supermarkets. Energies
  Academic article
• Saeed, Muhammad Zahid; Widell, Kristina Norne; Hafner, Armin; Svendsen, Eirik Starheim; Nordtvedt, Tom Ståle. (2021) Thermal Energy Storage with PCM for Refrigerated Sea Water System of Fishing Vessels. Science et technique du froid
  Academic article
• Barroca, Pierre Andre Calhau; Hafner, Armin; Verlaat, B; Petagna, P.; Hulek, Wojciech; Zwalinski, L. (2021) An Ultra-Low Temperature Transcritical R744 Refrigeration System for Future Detectors at CERN LHC . Applied Sciences
  Academic article
• Artuso, Paolo; Tosato, Giacomo; Rossetti, Antonio; Marinetti, Sergio; Hafner, Armin; Banasiak, Krzysztof. (2021) Dynamic modelling and validation of an air‐to‐water reversible R744 heat pump for high energy demand buildings. Energies
  Academic article
• Ye, Zuliang; Wang, Yikai; Zendehboudi, Alireza; Hafner, Armin; Cao, Feng. (2021) Investigation on the performance of fluted tube-in-tube gas cooler in transcritical CO2 heat pump water heater. International journal of refrigeration
  Academic article
• Smitt, Silje Marie; Tolstorebrov, Ignat; Hafner, Armin. (2021) Performance improvement of integrated CO<inf>2</inf> systems with HVAC and hot water for hotels. Thermal Science and Engineering Progress
  Academic article
• Smitt, Silje Marie; Tolstorebrov, Ignat; Gullo, Paride; Pardiñas, Ángel Á.; Hafner, Armin. (2021) Energy use and retrofitting potential of heat pumps in cold climate hotels. Journal of Cleaner Production
  Academic article
• Kolinchuk, Sergiy; Kriezi, Ekaterini E.; Hafner, Armin; Khoshidi, Vahid; Schlemminger, Christian. (2021) State-of-the-art CO2 refrigeration systems with integrated HVAC functions.
  Chapter
• Selvnes, Håkon; Allouche, Yosr; Manescu, Raluca Iolanda; Hafner, Armin. (2021) Review on cold thermal energy storage applied to refrigeration systems using phase change materials. Thermal Science and Engineering Progress
  Academic literature review
• Allymehr, Ehsan; Pardiñas, Ángel Á.; Eikevik, Trygve Magne; Hafner, Armin. (2021) Comparative analysis of evaporation of isobutane (R600a) and propylene (R1270) in compact smooth and microfinned tubes. Applied Thermal Engineering
  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
  Academic article
• Semaev, Pavel; Hafner, Armin. (2021) Energy efficient CO2 refrigeration units for fishing vessels. NTNU
  Masters thesis

2020

• Dasi, Koti; Singh, Simarpreet; Guruchethan, A.M.; Maiya, M.P.; Hafner, Armin; Banasiak, Krzysztof. (2020) Performance Evaluation of Ejector Based CO₂ System for Simultaneous Heating and Cooling Application in an Indian Dairy Industry. Thermal Science and Engineering Progress
  Academic article
• Allymehr, Ehsan; Pardiñas, Ángel Á.; Eikevik, Trygve Magne; Hafner, Armin. (2020) Characteristics of evaporation of propane (R290) in compact smooth and microfinned tubes. Applied Thermal Engineering
  Academic article
• Skulstad, Vegard; Kauko, Hanne; Hafner, Armin. (2020) Dynamic energy system with a local LTTG at Leangen. NTNU
  Masters thesis
• Schlemminger, Christian; Bjørgen, Karl Oskar Pires; Foslie, Sverre Stefanussen; Allouche, Yosr; Hafner, Armin. (2020) Field measurements of integrated MultiPACK supermarkets. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Álvarez Pardiñas, Ángel; Contiero, Luca; Hafner, Armin; Banasiak, Krzysztof; Larsen, Lars F.S.. (2020) Attaining a higher flexibility degree in CO2 compressor racks. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Selvnes, Håkon; Büttner, Vera; Hafner, Armin. (2020) Evaluation of a pillow-plate heat exchanger for a pump-circulated CO2 refrigeration system. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Tolstorebrov, Ignat; Zendehboudi, Alireza; Banasiak, Krzysztof; Köster, Lukas; Álvarez Pardiñas, Ángel; Hafner, Armin. (2020) Testing of tri-partite CO2 gas cooler prototype for domestic hot water and space heating. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Allymehr, Ehsan; Roux, Marie Isabelle; Álvarez Pardiñas, Ángel; Eikevik, Trygve Magne; Hafner, Armin. (2020) Experimental study of Isobutane (R600a) evaporation in microfinned and smooth tubes. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Saeed, Muhammad Zahid; Widell, Kristina Norne; Hafner, Armin; Nordtvedt, Tom Ståle; Svendsen, Eirik Starheim. (2020) Integrated thermal storage and heat recovery of the CO2 refrigeration system for fishing vessels. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Tosato, Giacomo; Minetto, Silvia; Rossetti, Antonio; Hafner, Armin; Schlemminger, Christian; Girotto, Sergio. (2020) Field data of CO2 integrated refrigeration, heating and cooling systems for supermarkets. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Ringstad, Knut Emil; Allouche, Yosr; Gullo, Paride; Ervik, Åsmund; Banasiak, Krzysztof; Hafner, Armin. (2020) A detailed review on CO2 two-phase ejector flow modeling. Thermal Science and Engineering Progress
  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
  Academic article
• Singh, Simarpreet; Hafner, Armin; Banasiak, Krzysztof; Seshadri, Satyanarayanan; Maiya, Prakash; Smitt, Silje Marie. (2020) Heat pump/chiller system for centralized kitchens in India. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Barroca, Pierre; Hafner, Armin; Álvarez Pardiñas, Ángel; Verlaat, B; Zwalinski, L; Hulek, Wojciech. (2020) Evaporative cooling system with natural refrigerant at -50 ℃ and 100 m underground. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Svendsen, Eirik Starheim; Hafner, Armin; Selvnes, Håkon; Widell, Kristina Norne. (2020) Energy flow analysis of a poultry processing plant. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Zhang, Zhanluo; Smitt, Silje Marie; Eikevik, Trygve Magne; Hafner, Armin. (2020) Machine learning methods for prediction of hot water demands in integrated R744 system for hotels. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Smitt, Silje Marie; Tolstorebrov, Ignat; Hafner, Armin. (2020) Integrated R744 unit for hotels: Analysis of field data. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Ringstad, Knut Emil; Hafner, Armin. (2020) Two-fluid CFD model for R744 two-phase ejectors. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Saeed, Muhammad Zahid; Widell, Kristina Norne; Hafner, Armin; Nordtvedt, Tom Ståle; Svendsen, Eirik Starheim. (2020) Cryogenic cold utilization and system integration possibilities for LNG-driven fishing vessels. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Smitt, Silje Marie; Hafner, Armin; Tolstorebrov, Ignat. (2020) Integrated CO2 system with HVAC and hot water for hotels: Field measurements and performance evaluation. International journal of refrigeration
  Academic article
• Doll, Johannes; Hafner, Armin; Sever, Mark; Schlemminger, Christian. (2020) Untersuchung einer kommerziellen R744 Supermarktkälteanlage mit Ejektortechnologie. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Opalic, Sven Myrdahl; Goodwin, Morten; Lei, Jiao; Nielsen, Henrik Kofoed; Pardiñas, Ángel Á.; Hafner, Armin. (2020) ANN modelling of CO2 refrigerant cooling system COP in a smart warehouse. Journal of Cleaner Production
  Academic article
• Kauko, Hanne; Rohde, Daniel; Hafner, Armin. (2020) Local Heating Networks with Waste Heat Utilization: Low or Medium Temperature Supply?. Energies
  Academic article

2019

• Singh, Simarpreet; Hafner, Armin; Banasiak, Krzysztof; Maiya, Prakash; Nekså, Petter. (2019) Experimental Evaluation of a Multi-Ejector Trans-critical CO2 System for Supermarkets. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Smitt, Silje Marie; Hafner, Armin. (2019) Numerical performance investigation of a CO2 heat pump and refrigeration system for a Nordic hotel. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Manescu, Raluca Iolanda; Allouche, Yosr; Janeiro, Ana Larranaga; Hafner, Armin. (2019) Experimental investigation on the integration of cold energy storage into a R744 refrigeration system. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Allymehr, Ehsan; Eikevik, Trygve Magne; Hafner, Armin. (2019) Experimental investigation of evaporation of propane (R-290) in small pipes. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Widell, Kristina Norne; Nordtvedt, Tom Ståle; Hafner, Armin. (2019) Er kuldemediet i kjøle- og fryseutstyr viktig for vårt klima?. Norsk Sjømat
  Article in business/trade/industry journal
• Taguas Garzon, Francisco Javier; Hafner, Armin. (2019) Heat pumps for energy efficient breweries. Science et technique du froid
  Academic article
• Kauko, Hanne; Sundal, Eirin Vannes; Hafner, Armin. (2019) Energy flow analysis of a smart thermal grid at Leangen. NTNU
  Masters thesis
• Mastrowski, Mikolaj; Smolka, Jacek; Hafner, Armin; Haida, Michal; Palacz, Michal; Banasiak, Krzysztof. (2019) Experimental study of the heat transfer problem in expansion devices in CO2 refrigeration systems. Energy
  Academic article
• Selvnes, Håkon; Allouche, Yosr; Sevault, Alexis; Hafner, Armin. (2019) A CFD analysis for the performance assessment of a novel design of plates-in-tank latent storage unit for freezing applications. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Smitt, Silje Marie; Hafner, Armin; Hoksrød, Erik. (2019) Presentation of the first combined CO2 heat pump, air conditioning and hot tap water system for a hotel in Scandinavia. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Ringstad, Knut Emil; Hafner, Armin; Allouche, Yosr. (2019) Investigation of CFD models for ammonia ejector design. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin; Pardiñas, Ángel Á.. (2019) CO2 refrigeration technology: Possible innovations. Science et technique du froid
  Academic article
• Selvnes, Håkon; Hafner, Armin; Kauko, Hanne. (2019) Design of a cold thermal energy storage unit for industrial applications using CO2 as refrigerant. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Manescu, Raluca Iolanda; Allouche, Yosr; Hafner, Armin. (2019) Experimental evaluation of ice storage inside a helical coil heat exchanger integrated into a R744 refrigeration system. Science et technique du froid
  Academic article
• Verlaat, B; Petagna, P.; Zwalinski, L; Daguin, J.; Giakoumi, D.; Bhanot, V. (2019) CO2 cooling challenges at CERN for the future phase 2 upgrade program. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Widell, Kristina Norne; Dhakal, Pranab Raj; Thakur, Maitri; Hafner, Armin. (2019) Refrigeration to prevent food losses. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Giacomelli, Francesco; Mazzelli, Federico; Banasiak, Krzysztof; Hafner, Armin; Milazzo, Adriano. (2019) Experimental and computational analysis of a R744 flashing ejector. International journal of refrigeration
  Academic article
• Gullo, Paride; Hafner, Armin; Banasiak, Krzysztof; Minetto, Silvia; Kriezi, Ekaterini E.. (2019) Multi-Ejector Concept: A Comprehensive Review on its Latest Technological Developments. Energies
  Academic article
• Hafner, Armin; Gabrielii, Cecilia H; Widell, Kristina Norne. (2019) Refrigeration units in marine vessels Alternatives to HCFCs and high GWP HFCs. Nordisk ministerråd TemaNord (527)
  Report
• 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
  Academic article
• Ahrens, Marcel Ulrich; Hafner, Armin; Eikevik, Trygve Magne. (2019) Compressors for ammonia-water hybrid absorption-compression heat pumps. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Selvnes, Håkon; Allouche, Yosr; Sevault, Alexis; Hafner, Armin. (2019) CFD modeling of ice formation and melting in horizontally cooled and heated plates.
  Academic chapter/article/Conference paper
• Andreasen, Glenn; Stoustrup, Jakob; Izadi-Zamanabadi, Roozbeh; Pardiñas, Ángel Á.; Hafner, Armin. (2019) Data-driven modeling of a CO2 refrigeration system. American Control Conference (ACC)
  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). International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Andreasen, Glenn; Stoustrup, Jakob; Pardiñas, Ángel Á.; Hafner, Armin; Izadi-Zamanabadi, R.. (2019) Data-driven modelling of a R744 refrigeration system with parallel compression configuration. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Abdin, Nour; Hafner, Armin; Girotto, Sergio; Menten, Franziska; Pruss, Yannick; Savigliano, Riccardo. (2019) CO₂ commercial refrigeration system in Jordan. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Haida, Michal; Smolka, Jacek; Hafner, Armin; Palacz, Michal; Ostrowski, Zeimowit; Bodys, Jakub. (2019) Performance operation of liquid ejectors for a R744 integrated multi-ejector supermarket system using a hybrid ROM. International journal of refrigeration
  Academic article
• Verpe, Espen Halvorsen; Tolstorebrov, Ignat; Sevault, Alexis; Hafner, Armin; Ladam, Yves. (2019) Cold thermal energy storage with low-temperature plate freezing of fish on offshore vessels. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Kumar, Kundan; Singh, Simarpreet; Kumar, Pramod; Maiya, M.P.; Hafner, Armin; Banasiak, Krzysztof. (2019) Experimental analysis of transcritical CO2 booster refrigeration system with heat recovery and ejector expansion. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Ringstad, Knut Emil; Allouche, Yosr; Gullo, Paride; Banasiak, Krzysztof; Hafner, Armin. (2019) CO2 ejector modelling using CFD: current status. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin. (2019) The advantages of natural working fluids. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Ahrens, Marcel Ulrich; Hafner, Armin; Eikevik, Trygve Magne. (2019) Development of Ammonia-Water Hybrid Absorption- Compression Heat Pumps. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Kihle, Jørgen Formo; Kauko, Hanne; Hafner, Armin. (2019) Smart thermal grid concepts for the Leangen area. NTNU
  Masters thesis
• Gullo, Paride; Hafner, Armin; Banasiak, Krzysztof. (2019) Thermodynamic Performance Investigation of Commercial R744 Booster Refrigeration Plants Based on Advanced Exergy Analysis. Energies
  Academic article

2018

• Blust, Stefanie; Hafner, Armin; Banasiak, Krzysztof; Nekså, Petter. (2018) Possible configurations of multiejector driven CO2 systems for Indian supermarkets. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Gullo, Paride; Hafner, Armin; Banasiak, Krzysztof. (2018) Efficient R744 technology for supermarket heating, cooling and refrigeration - a theoretical assessment of energy advantages in various Spanish cities. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin; Kvalsvik, Karoline Husevåg. (2018) Direct CO2-ground condensers. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Pardiñas, Ángel Á.; Hafner, Armin; Banasiak, Krzysztof. (2018) Integrated R744 ejector supportet parallel compression racks for supermarkets : experimental results. International Institute of Refrigeration
  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. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Gullo, Paride; Hafner, Armin; Banasiak, Krzysztof. (2018) Transcritical R744 refrigeration systems for supermarket applications: Current status and future perspectives. International journal of refrigeration
  Academic literature review
• Haida, Michal; Smolka, Jacek; Hafner, Armin; Mastrowski, Mikolaj; Palacz, Michal; Madsen, Kenneth B.. (2018) Numerical investigation of heat transfer in a CO2 two-phase ejector. Energy
  Academic article
• Gullo, Paride; Tsamos, Konstantinos M.; Hafner, Armin; Banasiak, Krzysztof; Ge, Yunting T.; Tassou, Savvas A.. (2018) Crossing CO2 equator with the aid of multi-ejector concept: A comprehensive energy and environmental comparative study. Energy
  Academic article
• Hafner, Armin; Nekså, Petter. (2018) Integrated CO2 solutions for supermarkets. Science et technique du froid
  Academic article
• Smitt, Silje Marie; Hafner, Armin. (2018) Integrated energy concepts for high performance hotel buildings. Science et technique du froid
  Academic 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
  Academic article
• Singh, Simarpreet; Banasiak, Krzysztof; Hafner, Armin; Maiya, M.P.; Nekså, Petter. (2018) Performance evaluation of CO2 ejector system with parallel compressor for supermarket application.
  Academic chapter/article/Conference paper
• Bodys, Jakub; Hafner, Armin; Banasiak, Krzysztof; Smolka, Jacek; Ladam, Yves. (2018) Design and simulations of refrigerated sea water chillers with CO2 ejector pumps for marine applications in hot climates. International Institute of Refrigeration
  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
  Article in business/trade/industry journal
• Selvnes, Håkon; Hafner, Armin. (2018) Energy distribution concepts for Urban Supermarkets including energy hubs. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Kvalsvik, Karoline Husevåg; Hafner, Armin. (2018) Integrated heating and cooling CO2 heat pump system in a modern distribution centre. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Pardiñas, Ángel Á.; Hafner, Armin; Banasiak, Krzysztof; Kvalsvik, Karoline Husevåg; Larsen, Lars. (2018) Strategy for the control of two groups of ejectors operating in parallel in Integrated R744 refrigeration systems. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Giacomelli, Francesco; Banasiak, Krzysztof; Hafner, Armin; Mazzelli, Frederico; Milazzo, Adriano. (2018) Experimental and numerical investigation on a ejector for CO2 vapor compression systems. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Haida, Michal; Smolka, Jacek; Hafner, Armin; Palacz, Michal; Ostrowski, Zeimowit; Madsen, Kenneth B.. (2018) The R744 multi-ejector hybrid CFD and experimentally-based reduced-order model. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Gullo, Paride; Purohit, Nilesh; Dasgupta, Mani Sankar; Hafner, Armin; Banasiak, Krzysztof. (2018) Comparative study of various supermarket refrigerating systems in European climate context. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Dhakal, Pranab Raj; Widell, Kristina Norne; Hafner, Armin. (2018) Mapping of cold chains in Nepal. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Gullo, Paride; Hafner, Armin; Banasiak, Krzysztof; Minetto, Silvia. (2018) A review on recent technological advancements in muliti-ejector concept. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Sevault, Alexis; Banasiak, Krzysztof; Bakken, Jørn; Hafner, Armin. (2018) A novel PCM accumulator for refrigerated display cabinet : design and CFD simulations. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Bodys, Jakub; Hafner, Armin; Banasiak, Krzysztof; Smolka, Jacek; Ladam, Yves. (2018) Design and simulations of refrigerated sea water chillers with CO2 ejector pumps for marine applications in hot climates. Energy
  Academic article
• Haida, Michal; Smołka, Jacek; Hafner, Armin; Ostrowski, Zeimowit; Palacz, Michał; Madsen, Kenneth B.. (2018) Performance mapping of the R744 ejectors for refrigeration and air conditioning supermarket application: A hybrid reduced-order model. Energy
  Academic article
• Gullo, Paride; Purohit, Nilesh; Dasgupta, Mani Sankar; Hafner, Armin. (2018) Energetic and environmental performance evaluation of AR744 multi-ejector enhanced parallel compression system in high ambient temperature locations. International Institute of Refrigeration
  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.
  Academic chapter/article/Conference paper
• Haida, Michal; Smolka, Jacek; Hafner, Armin; Mastrowski, Mikolaj; Madsen, Kenneth B.; Nowak, Andrzej J.. (2018) Heat Transfer Process Within The R744 Two-phase Ejector: Numerical And Experimental Study.
  Academic chapter/article/Conference paper
• Selvnes, Håkon; Hafner, Armin; Kauko, Hanne. (2018) Cold thermal storage integration in a large industrial refrigeration system. International Institute of Refrigeration
  Academic chapter/article/Conference paper

2017

• Palacz, Michal; Haida, Michal; Smolka, Jacek; Nowak, Andrzej J.; Banasiak, Krzysztof; Hafner, Armin. (2017) HEM and HRM accuracy comparison for the simulation of CO2 expansion in two-phase ejectors for supermarket refrigeration systems. Applied Thermal Engineering
  Academic article
• Bodys, Jakub; Palacz, Michal; Haida, Michal; Smolka, Jacek; Nowak, Andrzej J.; Banasiak, Krzysztof. (2017) Full-scale multi-ejector module for a carbon dioxide supermarket refrigeration system: Numerical study of performance evaluation. Energy Conversion and Management
  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
  Academic article
• Kauko, Hanne; Kvalsvik, Karoline Husevåg; Rohde, Daniel; Hafner, Armin; Nord, Natasa. (2017) Dynamic modelling of local low-temperature heating grids: A case study for Norway. Energy
  Academic article
• Haida, Michal; Smolka, Jacek; Hafner, Armin; Ostrowski, Zeimowit; Palacz, Michal; Nowak, Andrzej J.. (2017) System model derivation of the CO2 two-phase ejector based on the CFD-based reduced-order model. Energy
  Academic article
• Haida, Michal; Smolka, Jacek; Hafner, Armin; Palacz, Michal; Banasiak, Krzysztof; Nowak, Andrzej J.. (2017) Modified homogeneous relaxation model for the r744 trans-critical flow in a two-phase ejector. International journal of refrigeration
  Academic article
• Tsamos, Konstantinos; Gullo, Paride; Ge, Yunting; Santosa, IDewa; Santosa, *; Tassou, Savvas A.. (2017) Performance investigation of the CO2 gas cooler designs and its integration with the refrigeration system. Energy Procedia
  Academic article
• Gullo, Paride; Hafner, Armin; Cortella, Giovanni. (2017) Multi-ejector R744 booster refrigerating plant and air conditioning system integration – A theoretical evaluation of energy benefits for supermarket. International journal of refrigeration
  Academic article
• Gullo, Paride; Tsamos, Konstantinos; Hafner, Armin; Ge, Yunting; Tassou, Savvas A.. (2017) State-of-the-art technologies for transcritical R744 refrigeration systems – a theoretical assessment of energy advantages for European food retail industry. Energy Procedia
  Academic article
• Pardiñas, Ángel Á.; Hafner, Armin; Banasiak, Krzysztof. (2017) Novel integrated CO2 vapour compression racks for supermarkets. Thermodynamic analysis of possible system configurations and influence of operational conditions. Applied Thermal Engineering
  Academic article
• 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
  Academic article
• Gullo, Paride; Hafner, Armin. (2017) Thermodynamic performance assessment of a CO2 supermarket refrigeration system with auxiliary compression economization by using advanced exergy analysis. International Journal of Thermodynamics
  Academic article
• Kvalsvik, Karoline Husevåg; Banasiak, Krzysztof; Hafner, Armin. (2017) Integrated CO₂ refrigeration and AC unit for hot climates. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Pardiñas, Ángel Á.; Hafner, Armin; Banasiak, Krzysztof; Larsen, L.. (2017) Performance test methodology for the LCCP determination of supermarket and other integrated systems. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Jokiel, Michael; Kauko, Hanne; Schlemminger, Christian; Hafner, Armin; Claussen, Ingrid Camilla. (2017) Phase change material thermal energy storage for a large ammonia chiller/heat pump system. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Pardiñas, Ángel Á.; Hafner, Armin; Banasiak, Krzysztof. (2017) Integrated R744 ejector supported parallel compression racks for supermarkets. Operation conditions. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Pardiñas, Ángel Á.; Hafner, Armin; Banasiak, Krzysztof. (2017) Integrated R744 ejector supported parallel compression racks for supermarkets. Concept and steady state simulations of configurations. International Institute of Refrigeration
  Academic chapter/article/Conference paper

2016

• Palacz, Michal; Haida, Michal; Smolka, Jacek; Nowak, Andrzej J.; Hafner, Armin. (2016) A comparison of homogeneous equilibrium and relaxation model for CO2 expansion inside the two-phase ejector. Journal of Physics: Conference Series (JPCS)
  Academic article
• Hafner, Armin; Banasiak, Krzysztof. (2016) Flexible R744-Gewerbekältelaboranlage: Kälte- und –Klimaanlagenkonfigurationen mit Ejektorunterstützung. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Manescu, Raluca Iolanda; Hafner, Armin. (2016) Energy Storage Possibilities for Supermarket Refrigeration Units . DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Hafner, Armin; Boeck, Lutz; Banasiak, Krzysztof. (2016) Bahnklimatisierung mit R744 Anlagen. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Widell, Kristina Norne; Hafner, Armin; Nordtvedt, Tom Ståle. (2016) Kühlung von pelagischem Fisch - im Fokus: Blauer Wittling -. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Haida, Michal; Smolka, Jacek; Palacz, Michal; Bodys, Jakub; Nowak, Andrzej J.; Bulinski, Zbigniew. (2016) Numerical investigation of an R744 liquid ejector for supermarket refrigeration systems. Thermal Science
  Academic article
• Hu, Haitao; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin; Ding, Guoliang; Huang, Qingnan. (2016) Performance analysis of an R744 ground source heat pump system with air-cooled and water-cooled gas coolers. International journal of refrigeration
  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
  Academic article
• Hafner, Armin. (2016) Dette bør du gjøre nå . klikk.no
  Article in business/trade/industry journal
• Palacz, Michal; Smolka, Jacek; Kus, Waclaw; Fic, Adam; Bulinski, Zbigniew; Nowak, Andrzej J.. (2016) CFD-based shape optimisation of a CO2 two-phase ejector mixing section. Applied Thermal Engineering
  Academic article
• Hafner, Armin; Banasiak, Krzysztof; Herdlitschka, Timo; Fredslund, Kristian; Girotto, Sergio; Haida, Michal. (2016) R744 ejector system case: Italian supermarket, Spiazzo. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Pardiñas, Angel A.; Bantle, Michael; Hafner, Armin; Banasiak, Krzysztof; Fernandez-Seara, Jose. (2016) Modelling vapour compression cycles with R744 for residential heat pumps adapted to the Spanish climate. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin; Banasiak, Krzysztof; Boeck, Lutz. (2016) R744 train HVAC unit. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Bodys, Jakub; Smolka, Jacek; Palacz, Michal; Haida, Michal; Banasiak, Krzysztof; Nowak, Andrzej J.. (2016) Performance of fixed geometry ejectors with a swirl motion installed in a multi-ejector module of a CO2 refrigeration system. Energy
  Academic article
• Haida, Michal; Banasiak, Krzysztof; Smolka, Jacek; Hafner, Armin; Eikevik, Trygve Magne. (2016) Experimental analysis of the r744 vapour compression rack equipped with the multi-ejector expansion work recovery module. International journal of refrigeration
  Academic article
• Nowak, Andrzej J.; Palacz, Michal; Smolka, Jacek; Banasiak, Krzysztof; Bulinski, Zbigniew; Fic, Adam. (2016) CFD simulations of transport phenomena during transcritical flow of real fluid (CO2) within ejector. International journal of numerical methods for heat & fluid flow
  Academic article
• Smolka, Jacek; Palacz, Michal; Bodys, Jakub; Banasiak, Krzysztof; Fic, Adam; Bulinski, Zbigniew. (2016) Performance comparison of fixed- and controllable-geometry ejectors in a CO2 refrigeration system. International journal of refrigeration
  Academic article
• Palacz, Michal; Smolka, Jacek; Nowak, Andrzej J.; Banasiak, Krzysztof; Hafner, Armin. (2016) Shape optimisation of a two-phase ejector for CO2 refrigeration systems. International journal of refrigeration
  Academic article
• Hafner, Armin; Banasiak, Krzysztof. (2016) R744 ejector technology future perspectives. Journal of Physics: Conference Series (JPCS)
  Academic article
• Haida, Michal; Palacz, Michal; Smolka, Jacek; Nowak, Andrzej J.; Hafner, Armin; Banasiak, Krzysztof. (2016) A modified homogeneous relaxation model for CO2 two-phase flow in vapour ejector. Journal of Physics: Conference Series (JPCS)
  Academic article
• Bodys, Jakub; Palacz, Michal; Haida, Michal; Smolka, Jacek; Nowak, Andrzej J.; Banasiak, Krzysztof. (2016) Parallel Work of CO2 Ejectors Installed in a Multi-Ejector Module of Refrigeration System. Journal of Physics: Conference Series (JPCS)
  Academic article
• Banasiak, Krzysztof; Hafner, Armin; Scheid, Alexander; Smolka, Jacek; Palacz, Michal. (2016) Experimental and numerical analysis of R744 ejectors operated in part load. Science et technique du froid
  Academic article
• Haukås, Hans T.; Stene, Jørn; Rekstad, Inge Håvard; Nekså, Petter; Hafner, Armin; Eikevik, Trygve Magne. (2016) CO2 (R744) som kuldemedium. Norsk Kjøleteknisk Forening c/o Tekna,
  Compendium
• Pardiñas, Ángel Á.; Bantle, Michael; Hafner, Armin; Banasiak, Krzysztof; Fernández-Seara, José. (2016) Modelling vapour compression cycles with R744 for residential heat pumps adapted to the Spanish climate. Science et technique du froid
  Academic article
• Kriezi, Ekaterini E.; Fredslund, Kristian; Banasiak, Krzysztof; Hafner, Armin. (2016) R744 multi ejector development. Science et technique du froid
  Academic article
• Fidorra, N; Minetto, Silvia; Hafner, Armin; Banasiak, Krzysztof; Köhler, J.. (2016) Analysis of cold thermal energy storage concepts in CO2 refrigeration systems. International Institute of Refrigeration
  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. International Institute of Refrigeration
  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. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin; Banasiak, Krzysztof. (2016) Full scale supermarket laboratory R744 ejector supported & AC integrated parallel compression unit. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Haida, Michal; Banasiak, Krzysztof; Smolka, Jacek; Hafner, Armin; Madsen, Kenneth B.. (2016) Experimental analysis of the R744 vapour compression rack equipped with the multi-ejector expansion work recovery module. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Smolka, Jacek; Palacz, Michal; Haida, Michal; Bodys, Jakub; Bulinski, Zbigniew; Nowak, Andrzej J.. (2016) A performance comparison of fixed ejectors with and without a swirl generator and controllable ejectors in a CO2 refrigeration system. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Bodys, Jakub; Palacz, Michal; Smolka, Jacek; Haida, Michal; Bulinski, Zbigniew; Nowak, Andrzej J.. (2016) 3-D CFD modelling of multi-ejector module performance. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Palacz, Michal; Haida, Michal; Smolka, Jacek; Fic, Adam; Bulinski, Zbigniew; Nowak, Andrzej J.. (2016) An analysis of homogeneous relaxation model accuracy for the CO2 expansion inside the two-phase ejector. International Institute of Refrigeration
  Academic chapter/article/Conference paper

2015

• Hafner, Armin; Fredslund, K.; Banasiak, Krzysztof. (2015) Next generation R744 refrigeration technology for supermarkets. International Institute of Refrigeration
  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. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Banasiak, Krzysztof; Hafner, Armin; Kriezi, Ekaterini E.; Madsen, Kenneth B.; Birkelund, Michael; Fredslund, Kristian. (2015) Development and performance mapping of a multi-ejector expansion work recovery pack for R744 vapour compression units. International journal of refrigeration
  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 in business/trade/industry journal
• Banasiak, Krzysztof; Hafner, Armin; Steiner, A.. (2015) COP improvement of two-stage ammonia heat pumps by use of ejector. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Kriezi, Ekaterini E.; Fredslund, K.; Banasiak, Krzysztof; Hafner, Armin. (2015) Multi ejector and the impact of ejector design on the operation of a CO2 refrigeration system. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin. (2015) 2020 perspectives for CO2 refrigeration and heat pump systems. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Banasiak, Krzysztof; Hafner, Armin; Widell, Kristina Norne. (2015) Blast freezers (Part 2) R717 versus R744. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Banasiak, Krzysztof; Hafner, Armin; Widell, Kristina Norne. (2015) Blast freezers (Part 1) R717 versus R717 / R744 cascade. International Institute 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. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Banasiak, Krzysztof; Hafner, Armin; Palacz, Michal. (2015) State of the art in the identification of two-phase transonic flow phenomena in transcritical CO2 ejectors. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Palacz, Michal; Smolka, Jacek; Fic, Adam; Bulinski, Zbigniew; Nowak, Andrzej J.; Banasiak, Krzysztof. (2015) CDF-based shape optimisation of two-phase ejector for R744. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Fidorra, N; Hafner, Armin; Minetto, Silvia; Kohler, Jack. (2015) Low temperature heat storages in CO2 supermarket refrigeration systems. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Banasiak, Krzysztof; Hafner, Armin; Eikevik, Trygve Magne. (2015) Experimental characteristics of R744 ejectors for expansion work recovery in heat pumping installations. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin; Hemmingsen, Anne Karin. (2015) R744 refrigeration technologies for supermarkets in warm climates. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Clauss, John; Kauko, Hanne; Hafner, Armin; Eikevik, Trygve Magne. (2015) Wärmepumpen als Teil eines Smart Thermal Grids. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Hafner, Armin; Fredslund, Kristian; Banasiak, Krzysztof. (2015) R744 Ejektor Kältetechnik für Supermärkte. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Chapter
• Hafner, Armin; Nekså, Petter. (2015) System configurations for supermarkets in warm climates applying R744 refrigeration technologies - case studies of selected cities. International Institute of Refrigeration
  Chapter
• Palacz, Michal; Smolka, Jacek; Fic, Adam; Bulinski, Zbigniew; Nowak, Andrzej J.; Banasiak, Krzysztof. (2015) Application range of the HEM approach for CO2 expansion inside two-phase ejectors for supermarket refrigeration systems. International journal of refrigeration
  Academic article

2014

• Banasiak, Krzysztof; Hafner, Armin; Haddal, Olav Martin; Eikevik, Trygve Magne. (2014) Test facility for a multiejector R744 refrigeration system. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• 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. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin; Claussen, Ingrid Camilla; Schmidt, F.; Olsson, R.; Fredslund, K.; Eriksen, P.A.. (2014) Efficient and integrated energy systems for supermarkets. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Schönenberger, Jonas; Hafner, Armin; Banasiak, Krzysztof; Girotto, Sergio. (2014) Experience with ejectors implemented in a R744 booster system operating in a supermarket. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Fidorra, N; Hafner, Armin; Minetto, Silvia; Kohler, J. (2014) Applications of the supersmart energy-benchmark tool for supermarkets. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Xiong, Jie; Eikevik, Trygve Magne; Wang, Ruzhu; Banasiak, Krzysztof; Hafner, Armin. (2014) Experimental analysis of the influence of operating conditions on the performance (COP and ejector efficiency) of R744 heat pump with one-phase ejector. International Institute of Refrigeration
  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. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Tolstorebrov, Ignat; Bantle, Michael; Hafner, Armin; Kuz, B; Eikevik, Trygve Magne. (2014) Energy efficiency by vapor compression in superheated steam drying systems. International Institute of Refrigeration
  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. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin; Försterling, Sven; Banasiak, Krzysztof. (2014) Multi-ejector concept for R-744 supermarket refrigeration. International journal of refrigeration
  Academic article
• Wiedenmann, Erik; Schönenberger, Jonas; Hafner, Armin; Banasiak, Krzysztof; Girotto, Sergio. (2014) Effiziente Kälteerzeugung im Supermarkt mittels CO2-Booster-Kälteanlage und Ejektor. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Chapter
• Hafner, Armin; Banasiak, Krzysztof. (2014) Versuchsstand für ein Multi-Ejektor R744 Kühlsystem. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Bantle, Michael; Tolstorebrov, Ignat; Hafner, Armin. (2014) Energierückgewinnung mittels Brüden-Kompression in Trocknungssystemen mit überhitztem Dampf. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Stavset, Ole; Banasiak, Krzysztof; Hafner, Armin. (2014) Analysis of high temperature heat pumps applying natural working fluids. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin; Nordtvedt, Tom Ståle; Gukelberger, E.; Banasiak, Krzysztof; Widell, Kristina Norne. (2014) Design of a R717/R744 cascade system for the pelagic fish industry. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Banasiak, Krzysztof; Hafner, Armin; Eikevik, Trygve Magne; Haddal, Olav Martin. (2014) CFD Case Study of R744 ejectors. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Banasiak, Krzysztof; Palacz, Michal; Hafner, Armin; Bulinski, Zbigniew; Smolka, Jacek; Nowak, Andrzej J.. (2014) A CFD-based investigation of the energy performance of two-phase R744 ejectors to recover the expansion work in refrigeration systems: An irreversibility analysis. International journal of refrigeration
  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
• Hafner, Armin; Hemmingsen, Anne Karin; Van de Ven, Adinda. (2014) R744 refrigeration system configurations for supermarkets in warm climates. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin; Schönenberger, Jonas; Banasiak, Krzysztof; Girotto, Sergio. (2014) R744 Ejector supported parallel vapour compression system. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Fidorra, N; Hafner, Armin; Minetto, Silvia; Köhler, Jochen. (2014) Simulation models in the supersmart supermarket - energy-benchmark tool. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Wang, Chi-Chuan; Hafner, Armin; Kuo, Cheng-Shu; Hsieh, Wen-Der. (2014) Influence of Lubricant on the Nucleate Boiling Heat Transfer Performance of Refrigerant — A Review. Heat Transfer Engineering
  Academic article

2013

• Rekstad, Inge Håvard; Hafner, Armin; Sigmund, Jenssen. (2013) Eficiencia Energetica de un Refrigerador y un Calentador de Agua Que Utilizan Dioxido de Carbono Como Refrigerante en una Vaqueria. Frio, Calor y Aire Acondicionado
  Academic article
• Banasiak, Krzysztof; Palacz, Michal; Hafner, Armin; Bulinski, Zbigniew; Smolka, Jacek; Nowak, Andrzej J.. (2013) CFD-based investigation of the energy performance of two-phase R744 ejectors to recover the expansion work in refrigeration systems: An irreversibility analysis. International journal of refrigeration
  Academic article
• Banasiak, Krzysztof; Hafner, Armin; Hemmingsen, Anne Karin. (2013) Influence of ejector performance on the overall efficiency of ammonia ejector refrigeration cycle. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Schwan, Johannes; Boeck, Lutz; Hafner, Armin. (2013) Untersuchung von Ausführungsmöglichkeiten einer CO2-Klimaanlage für ein Regionalverkehrsfahrzeug. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Chapter
• Beuttel, Tobias; Eikevik, Trygve Magne; Hafner, Armin. (2013) Analyse der Unterkühlung unter Verwendung verschiedener ein- und zweiphasiger Propylenglykol Lösungen. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Chapter
• Titze, Maren; Lemke, Nicholas; Hafner, Armin; Köhler, Jürgen. (2013) Entwicklung und Simulation Luftaufbereitungs- und Kälteanlageanlage im Supermarkt mit Wärmerückgewinnung. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Chapter
• Hafner, Armin; Schmälzle, Christian; Claussen, Ingrid Camilla; Schundelmeier, Jens. (2013) Leistungsmessungen: R744 Verdichter, 380cm3 Hubvolumen. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Chapter
• Hafner, Armin; Justo Alonso, Maria; Schmälzle, Christian; Nekså, Petter. (2013) High efficient 18-90 m3/h R744 compressor. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Friess, Yannick; Eikevik, Trygve Magne; Hafner, Armin. (2013) Analyse der Unterkühlung wässriger Lösungen mit verschiedenen Additiven und Wärmeübertrageroberflächen. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Chapter
• Van de Ven, Adinda; Hafner, Armin; Eikevik, Trygve Magne. (2013) Bewertung von weiterentwickelten R744 Supermarktkälteanlagen für warme Klimazonen. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Chapter
• Schönenberger, Jonas; Hafner, Armin; Banasiak, Krysztof; Girotto, Sergio. (2013) Effiziente Kälteerzeugung im Supermarkt mittels CO2-Booster-Kälteanlage und Ejektor. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Chapter
• Fidorra, Nicolas; Hafner, Armin; Lemke, Nicholas; Köhler, Jürgen. (2013) Supersmart-Energiebenchmarktool für Supermärkte. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Rohde, Daniel; Hafner, Armin. (2013) Verbrauchsanalyse von PKW-Klimaanlagen : Berechnung des jährlichen Verbrauchs mit dynamischen Simulationsmodellen. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Chapter
• Heyse, Christoph; Hafner, Armin; Eikevik, Trygve Magne. (2013) Hochtemperatur-Absorptionswärmepumpen. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Chapter
• Banasiak, Krysztof; Hafner, Armin. (2013) Mathematical modelling of supersonic two-phase R744 flows through converging-diverging nozzles: The effects of phase transition models. Applied Thermal Engineering
  Academic article
• Smolka, Jacek; Bulinski, Zbigniew; Fic, Adam; Nowak, Andrzej J.; Banasiak, Krzysztof; Hafner, Armin. (2013) A computational model of a transcritical R744 ejector based on a homogeneous real fluid approach. Applied Mathematical Modelling
  Academic article
• Minetto, Silvia; Brignoli, Riccardo; Banasiak, Krysztof; Hafner, Armin; Zilio, Claudio. (2013) Performance assessment of an off-the-shelf R744 heat pump equipped with an ejector. Applied Thermal Engineering
  Academic article

2012

• Hennig, Jakob; Hafner, Armin; Eikevik, Trygve Magne. (2012) Solare Kühlsysteme – Klassifizierung und energetische Bewertung. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Prosi, Nicolai; Eikevik, Trygve Magne; Hafner, Armin. (2012) Analyse der Underkühlung von wässrigen Lösungen mit verschiedenen Additiven und Mischverhältnissen. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Hafner, Armin; Claussen, Ingrid Camilla; Schmälzle, Christian; Obrist, Frank. (2012) Hocheffizienter R744 Verdichter mit 380 cm3 Hubvolumen. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Hafner, Armin; Försterling, Sven; Banasiak, Krzysztof. (2012) Multi-Ejektoren Konzept für R-744 Supermarkt-Kälteanlagen. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Wang, Chi-Chuan; Hafner, Armin; Kuo, Cheng-Shu; Hsieh, Wen-Der. (2012) An overview of the effect of lubricant on the heat transfer performance on conventional refrigerants and natural refrigerant R-744. Renewable and Sustainable Energy Reviews
  Academic literature review
• Banasiak, K; Hafner, Armin; Andresen, Trond. (2012) Experimental and numerical investigation of the influence of the two-phase ejector geometry on the performance of the R744 heat pump. International journal of refrigeration
  Academic article
• Denecke, Julius; Hafner, Armin; Eikevik, Trygve Magne; Ladam, Yves. (2012) Heat Recovery Solutions for R744 Booster Commercial Refrigeration Systems. International Institute of Refrigeration
  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. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Banasiak, Krysztof; Hafner, Armin; Eikevik, Trygve Magne. (2012) Experimental Study of a Triple-passage Motive Nozzle Ejector in a Small R744 Heat Pump. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin; Försterling, Sven; Andreassen, Hanne Elisabeth Bø; Walnum, Harald Taxt. (2012) Une climatisatin pivotante "reversible" pour les trains. Revue Generale du Froid et du conditionnement d'Air
  Article in business/trade/industry journal
• Albert, Daniel; Nordtvedt, Tom Ståle; Hafner, Armin; Ladam, Yves; Cibis, Dominik. (2012) Design of a hear recovery system in an aluminium casthouse. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Hafner, Armin; Schmälzle, Christian; Nekså, Petter; Obrist, Frank; Rekstad, Inge Håvard. (2012) High efficient 100 kW elR744 compressor. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Nordtvedt, Tom Ståle; Hafner, Armin. (2012) Integration of refrigeration and HVAC in supermarkets. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Minetto, Silvia; Brignoli, Riccardo; Banasiak, Krysztof; Hafner, Armin; Francesco, Tesser. (2012) Experimental analysis of a R744 heat pump equipped with an ejector. International Institute of Refrigeration
  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. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Banasiak, Krysztof; Hafner, Armin. (2012) Mathematical modeling of the phase transition processes with metastability effects for transcritical R744 converging-diverging nozzles. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Rekstad, Inge Håvard; Hafner, Armin; Jenssen, Sigmund. (2012) Energy efficient diary shed milk cooler and water heater using carbon dioxide as refrigerant. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin; Walnum, Harald Taxt; Försterling, Sven; Andreassen, Hanne Elisabeth Bø. (2012) Unidad reversible de Air HVAC para trenes publicos. Frio, Calor y Aire Acondicionado
  Article in business/trade/industry journal

2011

• Hafner, Armin; Nekså, Petter; Ladam, Yves; Eikevik, Trygve Magne. (2011) Oljefrie CO2 systemer for industrielle og kommersielle anvendelser. Kulde
  Academic article
• Hafner, Armin. (2011) Ölfreie Wärmepumpenanlagen mit R744 (CO2). DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Denecke, Julius; Hafner, Armin. (2011) Efficiency improvement of Commercial Refrigeration Systems. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Hafner, Armin; Försterling, Sven; Bothe, Franziska. (2011) Simulation von R744 Turboverdichtern. DKV - Deutscher Kälte- und Klimatechnischer Verein
  Academic chapter/article/Conference paper
• Banasiak, Krzysztof; Hafner, Armin. (2011) 1D Computational model of a two-phase R744 ejector for expansion work recovery. International Journal of Thermal Sciences
  Academic article
• Hafner, Armin; Nordtvedt, Tom Ståle; Rumpf, Ingrid. (2011) Energy saving potential in freezing applications by applying cold thermal energy storage with solid carbon dioxide. Procedia Food Science
  Academic article
• Hafner, Armin. (2011) Laboratory investigation of different ejector geometries for R744 transcritical systems. International Journal of Air-Conditioning and Refrigeration
  Academic article
• Banasiak, Kristof; Hafner, Armin; Andresen, Trond. (2011) Experimental and numerical investigation on R744 ejector geometry. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin. (2011) Environmental impact of heat pumping systems. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin; Försterling, Sven; Andreassen, Hanne Elisabeth Bø; Walnum, Harald Taxt. (2011) Air reversing HVAC unit for public trains. International Institute 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. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin. (2011) ENVIRONMENTAL IMPACT OF HEAT PUMPING SYSTEMS. Actes du ... Congres international du froid
  Academic article
• Hafner, Armin; Försterling, Sven; Andreassen, Hanne Elisabeth Bø; Walnum, Harald Taxt. (2011) AIR REVERSING HVAC UNIT FOR PUBLIC TRAINS. Actes du ... Congres international du froid
  Academic article

2010

• Hafner, Armin; Christensen, Øystein Torp; Nekså, Petter. (2010) Reversible R744 (CO2) heat pumps applied in public trains. International Institute of Refrigeration
  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. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Rumpf, Ingrid D; Hafner, Armin. (2010) Feasibility study of CO2 accumulation. Teknisk rapport (SINTEF Energiforskning) (TR A7014)
  Report
• Banasiak, Krzysztof; Hafner, Armin; Smolka, Jacek. (2010) 1-D computational model of a motive nozzle for the R744 two-phase ejector. International Institute of Refrigeration
  Academic chapter/article/Conference paper

2009

• Hafner, Armin. (2009) B-COOL Project - Ford Ka and Fiat Panda R-744 MAC systems.
  Academic chapter/article/Conference paper

2008

• Hafner, Armin. (2008) Air reversing R744 conditioning system.
  Academic chapter/article/Conference paper

2007

• Hafner, Armin. (2007) Design and parametric investigation on ejector for R-744 transcritical system. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Drescher, Michael; Hafner, Armin; Jakobsen, Arne. (2007) Experimental investigation of an ejector for R-744 transcritical systems. International Institute of Refrigeration
  Academic chapter/article/Conference paper
• Hafner, Armin; Nekså, Petter. (2007) Global environmental and economic benefits of introducing R-744 mobile air conditioning. International Institute of Refrigeration
  Academic chapter/article/Conference paper

2006

• Hafner, Armin; Nekså, Petter. (2006) Globale Konsequenzen bei der Einführung von Fahrzeugklimaanlagen mit dem Kältemittel R-744.
  Academic chapter/article/Conference paper
• Hafner, Armin. (2006) Construction of a CO2 pipeline test rig for R&D and operator training. Elsevier
  Academic chapter/article/Conference paper
• Hafner, Armin; Nekså, Petter. (2006) Global environmental consequences of introducing R-744 (CO2) mobile air conditioning. International Institute of Refrigeration
  Academic chapter/article/Conference paper

2004

• Hafner, Armin. (2004) Life Cycle Climate Performance (LCCP) von Mobilen Kältenanlagen mit R-134a, R-152a und R-744.
  Academic chapter/article/Conference paper
• Hafner, Armin. (2004) Major design issues for compact interior heat exchangers.
  Academic chapter/article/Conference paper

2002

• Hafner, Armin. (2002) Compact heat exchangers for mobile CO2 systems.
  Academic chapter/article/Conference paper

2000

• Hafner, Armin. (2000) Experimental study on heat pump operation of prototype CO2 mobile air conditioning system.
  Academic chapter/article/Conference paper

1998

• Hafner, Armin; Munkejord, Svend Tollak. (1998) Wärmeübertragung und Druckabfall von R744 (CO2) in extrudierten Aluminium-Multiport-Profilen bei Überkritischer Abkühlung.
  Academic chapter/article/Conference paper