2023

• Hafner, Armin. (2023) Smart CO2 refrigeration and heat pumping systems. 10th Conference on Ammonia and CO2 Refrigeration Technologies.
  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. 10th Conference on Ammonia and CO2 Refrigeration Technologies.
  Academic chapter/article/Conference paper
• 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. volum 289.
  Academic article
• 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. volum 148.
  Academic article
• Piesch, Nina; Niroomand, Reza; Hafner, Armin; Banasiak, Krzysztof; Ayad, Fadil. (2023) R744 heat pump solutions for electric vehicles. 10th Conference on Ammonia and CO2 Refrigeration Technologies.
  Academic chapter/article/Conference paper
• Ren, Shuai; Ahrens, Marcel Ulrich; Hamid, Khalid; Tolstorebrov, Ignat; Hafner, Armin; Eikevik, Trygve Magne; Widell, Kristina Marianne Norne. (2023) PERFORMANCE MODELLING OF AMMONIA-WATER ABSORPTION-COMPRESSION HEAT PUMP FOR STEAM GENERATION IN FOOD PROCESSING. 10th Conference on Ammonia and CO2 Refrigeration Technologies.
  Academic chapter/article/Conference paper
• Selvnes, Håkon; Alvarez Pardinas, Angel; Hafner, Armin. (2023) Cold thermal energy storage for air conditioning in a supermarket CO2 booster refrigeration system. 10th Conference on Ammonia and CO2 Refrigeration Technologies.
  Academic chapter/article/Conference paper
• Söylemez, Engin; ERB, Kevin; Schubert, Maike; Gerber, Raphael; Carbonell, Daniel; Hazarika, Mihir Mouchum; Hafner, Armin. (2023) Performance analysis of a CO2-ice heat pump. 10th Conference on Ammonia and CO2 Refrigeration Technologies.
  Academic chapter/article/Conference paper

2022

• Abdin, Mohammad; Mehyar, Yousef; Abdin, Nour; Abdin, Firas; Hafner, Armin. (2022) Natural Working Fluids in Retail Applications in Jordan & MENA Region. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  Academic chapter/article/Conference paper
• Ahrens, Marcel Ulrich; Brækken, August; Foslie, Sverre Stefanussen; Moen, Ole Marius; Lovas, Kim Andre; Bantle, Michael; Hafner, Armin; Eikevik, Trygve Magne. (2022) Performance analysis of high temperature heat pumps and thermal energy storages for a dairy. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  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. volum 219.
  Academic article
• 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. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  Academic chapter/article/Conference paper
• Blust, Stefanie; Barroca, Pierre; Petagna, Paolo; Hanf, Pierre; Hafner, Armin. (2022) R744 modular refrigeration technology at -50℃. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  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. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  Academic chapter/article/Conference paper
• Contiero, Luca; Fabris, F; Pardiñas, Ángel Á.; Hafner, Armin. (2022) Performance improvements of supermarket R744 systems by pivoting compressor arrangements. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  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. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  Academic chapter/article/Conference paper
• Elarga, Hagar; Hafner, Armin. (2022) CO2 heat pump/chiller system for a hotel in a tropical climate: a numerical investigation. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  Academic chapter/article/Conference paper
• 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. volum 222.
  Academic article
• 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. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  Academic chapter/article/Conference paper
• Guruchethan, A.M.; Maiya, M.P.; Hafner, Armin. (2022) Effect of subcooling using expander-compressor unit in transcritical CO2. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  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. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  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. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  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. 7th IIR International Conference on Sustainability and the Cold Chain - Proceedings.
  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. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  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. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  Academic chapter/article/Conference paper
• 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. volum 214.
  Academic article
• 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. volum 221.
  Academic article
• Pachai, Alexander C.; Hafner, Armin; Ciconkov, Risto. (2022) Application of natural refrigerants in the industrial refrigeration and heat pumps in the future. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  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. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  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. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  Academic chapter/article/Conference paper
• Ringstad, Knut Emil; Banasiak, Krzysztof; Ervik, Åsmund; Hafner, Armin. (2022) Swirl-Bypass Nozzle for CO2 Two-Phase Ejectors: Numerical Design Exploration. Energies. volum 15 (18).
  Academic article
• Saeed, Muhammad Zahid; Hafner, Armin; Thatte, Azam; Gabrielii, Cecilia H. (2022) Simultaneous implementation of rotary pressure exchanger and ejectors for CO2 refrigeration system. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  Academic chapter/article/Conference paper
• 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. volum 212.
  Academic article
• Selvnes, Håkon; Jenssen, Sigmund; Sevault, Alexis; Widell, Kristina Norne; Ahrens, Marcel Ulrich; Ren, Shuai; Hafner, Armin. (2022) Integrated CO2 refrigeration and heat pump systems for dairies. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  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. 7th IIR International Conference on Sustainability and the Cold Chain - Proceedings.
  Academic chapter/article/Conference paper
• Singh, Simarpreet; Selvnes, Håkon; Pardiñas, Ángel Á.; Reddy, Srinevas K; Gupta, P; Vaishak, S; Arun, B.S.; Widell, Kristina Norne; Elarga, Hagar; Hafner, Armin. (2022) Advanced R744 solution for supermarkets, hotel chillers and maritime applications in India. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  Academic chapter/article/Conference paper
• 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. volum 15 (9).
  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. volum 140.
  Academic article
• 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. 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2022 - Proceedings - Trondheim, Norway, June 13-15th 2022.
  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. volum 217.
  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. volum 140.
  Academic article

2021

• Ahrens, Marcel Ulrich; Loth, Maximilian; Tolstorebrov, Ignat; Hafner, Armin; Kabelac, Stephan; Wang, Ruzhu; Eikevik, Trygve Magne. (2021) Identification of Existing Challenges and Future Trends for the Utilization of Ammonia-Water Absorption–Compression Heat Pumps at High Temperature Operation. Applied Sciences. volum 11 (10).
  Academic literature review
• 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. 9th Conference on Ammonia and CO2 Refrigeration Technologies Ohrid, R. Macedonia September 16-17, 2021 Proceedings.
  Academic chapter/article/Conference paper
• Ahrens, Marcel Ulrich; Tønsberg, Even Kristian; Tolstorebrov, Ignat; Hafner, Armin; Eikevik, Trygve Magne. (2021) Modelling Approach for a Liquid-Injected Ammonia-Water Screw Compressor. 10th IIR Conference on Compressors and Refrigerants.
  Academic chapter/article/Conference paper
• 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. volum 188.
  Academic article
• Allymehr, Ehsan; Pardiñas, Ángel Á.; Eikevik, Trygve Magne; Hafner, Armin. (2021) Condensation of hydrocarbons in compact smooth and microfinned tubes. Energies. volum 14 (9).
  Academic article
• Allymehr, Ehsan; Skaugen, Geir; Will, Torsten; Pardiñas, Ángel Á.; Eikevik, Trygve Magne; Hafner, Armin; Schnabel, Lena. (2021) Numerical Study of Hydrocarbon Charge Reduction Methods in HVAC Heat Exchangers. Energies. volum 14 (15).
  Academic article
• Artuso, Paolo; Tosato, Giacomo; Rossetti, Antonio; Marinetti, Sergio; Hafner, Armin; Banasiak, Krzysztof; Minetto, Silvia. (2021) Dynamic modelling and validation of an air‐to‐water reversible R744 heat pump for high energy demand buildings. Energies. volum 14 (24).
  Academic article
• Barroca, Pierre Andre Calhau; Hafner, Armin; Verlaat, B; Petagna, P.; Hulek, Wojciech; Zwalinski, L; Hanf, Pierre; Battistin, Michele; Davoine, Loic; Teixeira, Daniella. (2021) An Ultra-Low Temperature Transcritical R744 Refrigeration System for Future Detectors at CERN LHC. Applied Sciences. volum 11 (16).
  Academic article
• Barroca, Pierre; Verlaat, B; Hafner, Armin; Blust, Stefanie; Hulek, Wojciech; Zwalinski, L; Teixeira, Daniella. (2021) Safety and reliability assessment of CO2 refrigeration system for underground applications below -50 °C. 9th Conference on Ammonia and CO2 Refrigeration Technologies Ohrid, R. Macedonia September 16-17, 2021 Proceedings.
  Academic chapter/article/Conference paper
• Contiero, Luca; Hafner, Armin; Pardiñas, Ángel Á.. (2021) Multi Ejector and pivoting-supported R744 application with AC for supermarkets. 9th Conference on Ammonia and CO2 Refrigeration Technologies Ohrid, R. Macedonia September 16-17, 2021 Proceedings.
  Academic chapter/article/Conference paper
• 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. volum 249.
  Academic article
• 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. volum 238.
  Academic article
• Hafner, Armin; Ciconkov, Risto. (2021) Current state and market trends in technologies with natural refrigerants. 9th Conference on Ammonia and CO2 Refrigeration Technologies Ohrid, R. Macedonia September 16-17, 2021 Proceedings.
  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. 10th IIR Conference on Compressors and Refrigerants.
  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. 10th IIR Conference on Compressors and Refrigerants.
  Academic chapter/article/Conference paper
• Kolinchuk, Sergiy; Kriezi, Ekaterini E.; Hafner, Armin; Khoshidi, Vahid; Schlemminger, Christian. (2021) State-of-the-art CO2 refrigeration systems with integrated HVAC functions. Refrigeration 2021 Conference, May 17-18, Melbourne.
  Chapter
• 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). 9th Conference on Ammonia and CO2 Refrigeration Technologies Ohrid, R. Macedonia September 16-17, 2021 Proceedings.
  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). 9th Conference on Ammonia and CO2 Refrigeration Technologies Ohrid, R. Macedonia September 16-17, 2021 Proceedings.
  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. volum 14:6926 (21).
  Academic article
• Ringstad, Knut Emil; Banasiak, Krzysztof; Ervik, Åsmund; Hafner, Armin. (2021) Machine learning and CFD for mapping and optimization of CO2 ejectors. Applied Thermal Engineering. volum 199.
  Academic article
• Ringstad, Knut Emil; Banasiak, Krzysztof; Hafner, Armin. (2021) CFD-based design algorithm for CO2 ejectors. 9th Conference on Ammonia and CO2 Refrigeration Technologies Ohrid, R. Macedonia September 16-17, 2021 Proceedings.
  Academic chapter/article/Conference paper
• Ringstad, Knut Emil; Hafner, Armin. (2021) Comparative study of R744 ejector CFD models. 10th IIR Conference on Compressors and Refrigerants.
  Academic chapter/article/Conference paper
• 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. 9th Conference on Ammonia and CO2 Refrigeration Technologies Ohrid, R. Macedonia September 16-17, 2021 Proceedings.
  Academic chapter/article/Conference paper
• 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
• Schlemminger, Christian; Ahrens, Marcel Ulrich; Foslie, Sverre Stefanussen; Moen, Ole Marius; Bantle, Michael; Hafner, Armin; Jenssen, Sigmund. (2021) Höchtemperatur-Wärmepumpen mit natürlichen Kältemitteln : Fallstudien zur HTWP-Integration für industrielle Kälte- und Prozessheisswasserherstellung. Deutsche Kälte-Klima-Tagung 2021 Dresden (Tagungsbericht).
  Academic chapter/article/Conference paper
• Selvnes, Håkon; Allouche, Yosr; Hafner, Armin. (2021) A cold thermal energy storage unit for CO2 refrigeration using phase change material: First experimental results. 9th Conference on Ammonia and CO2 Refrigeration Technologies Ohrid, R. Macedonia September 16-17, 2021 Proceedings.
  Academic chapter/article/Conference paper
• 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. volum 199.
  Academic article
• 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. volum 22.
  Academic literature review
• Semaev, Pavel; Söylemez, Engin; Tolstorebrov, Ignat; Hafner, Armin; Widell, Kristina Norne; Lund, Thomas; Øy, Jostein; Urke, Jan Petter. (2021) Simulation of a carbon dioxide (R-744) refrigeration system for fishing vessel. 9th Conference on Ammonia and CO2 Refrigeration Technologies Ohrid, R. Macedonia September 16-17, 2021 Proceedings.
  Academic chapter/article/Conference paper
• 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
• Singh, Simarpreet; Pardiñas, Ángel Á.; Hafner, Armin; Schlemminger, Christian; Banasiak, Krzysztof. (2021) R744 Refrigeration Solution for Small Supermarkets. 9th Conference on Ammonia and CO2 Refrigeration Technologies Ohrid, R. Macedonia September 16-17, 2021 Proceedings.
  Academic chapter/article/Conference paper
• Smitt, Silje Marie; Pardiñas, Ángel Á.; Hafner, Armin. (2021) Evaluation of Integrated Concepts with CO2 for Heating, Cooling and Hot Water Production. Energies. volum 14 (4).
  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. volum 298.
  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. volum 23.
  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. volum 135.
  Academic article
• 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. volum 178.
  Academic article

2020

• 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. volum 181.
  Academic article
• 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. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
  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. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
  Academic chapter/article/Conference paper
• Barroca, Pierre; Hafner, Armin; Álvarez Pardiñas, Ángel; Verlaat, B; Zwalinski, L; Hulek, Wojciech; Petagna, P.; Hanf, Pierre; Battistin, M. (2020) Evaporative cooling system with natural refrigerant at -50 ℃ and 100 m underground. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
  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
• Doll, Johannes; Hafner, Armin; Sever, Mark; Schlemminger, Christian. (2020) Untersuchung einer kommerziellen R744 Supermarktkälteanlage mit Ejektortechnologie. Deutsche Kälte‐ und Klimatagung 2020.
  Academic chapter/article/Conference paper
• Svendsen, Eirik Starheim; Hafner, Armin; Selvnes, Håkon; Widell, Kristina Norne. (2020) Energy flow analysis of a poultry processing plant. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
  Academic chapter/article/Conference paper
• Kauko, Hanne; Rohde, Daniel; Hafner, Armin. (2020) Local Heating Networks with Waste Heat Utilization: Low or Medium Temperature Supply?. Energies. volum 13 (4).
  Academic article
• Opalic, Sven Myrdahl; Goodwin, Morten; Lei, Jiao; Nielsen, Henrik Kofoed; Pardiñas, Ángel Á.; Hafner, Armin; Kolhe, Mohan Lal. (2020) ANN modelling of CO2 refrigerant cooling system COP in a smart warehouse. Journal of Cleaner Production. volum 260.
  Academic article
• 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. volum 20.
  Academic article
• Ringstad, Knut Emil; Hafner, Armin. (2020) Two-fluid CFD model for R744 two-phase ejectors. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
  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. 6th IIR Conference on Sustainability and the Cold Chain - Proceedings.
  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. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
  Academic chapter/article/Conference paper
• Schlemminger, Christian; Bjørgen, Karl Oskar Pires; Foslie, Sverre Stefanussen; Allouche, Yosr; Hafner, Armin. (2020) Field measurements of integrated MultiPACK supermarkets. 6th IIR Conference on Sustainability and the Cold Chain - Proceedings.
  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. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
  Academic chapter/article/Conference paper
• Singh, Simarpreet; Hafner, Armin; Banasiak, Krzysztof; Seshadri, Satyanarayanan; Maiya, Prakash; Smitt, Silje Marie; Gabrielii, Cecilia H. (2020) Heat pump/chiller system for centralized kitchens in India. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
  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
• 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. volum 116.
  Academic article
• Smitt, Silje Marie; Tolstorebrov, Ignat; Hafner, Armin. (2020) Integrated R744 unit for hotels: Analysis of field data. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
  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. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
  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. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
  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. Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020.
  Academic chapter/article/Conference paper

2019

• Abdin, Nour; Hafner, Armin; Girotto, Sergio; Menten, Franziska; Pruss, Yannick; Savigliano, Riccardo. (2019) CO₂ commercial refrigeration system in Jordan. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
  Academic chapter/article/Conference paper
• Ahrens, Marcel Ulrich; Hafner, Armin; Eikevik, Trygve Magne. (2019) Development of Ammonia-Water Hybrid Absorption- Compression Heat Pumps. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
  Academic chapter/article/Conference paper
• Ahrens, Marcel Ulrich; Hafner, Armin; Eikevik, Trygve Magne. (2019) Compressors for ammonia-water hybrid absorption-compression heat pumps. 8th Conference on Ammonia and CO2 Refrigeration Technologies, Proceedings.
  Academic chapter/article/Conference paper
• Allymehr, Ehsan; Eikevik, Trygve Magne; Hafner, Armin. (2019) Experimental investigation of evaporation of propane (R-290) in small pipes. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
  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). volum 2019-July.
  Academic article
• 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. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
  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
• Giacomelli, Francesco; Mazzelli, Federico; Banasiak, Krzysztof; Hafner, Armin; Milazzo, Adriano. (2019) Experimental and computational analysis of a R744 flashing ejector. International journal of refrigeration. volum 107.
  Academic article
• Gullo, Paride; Hafner, Armin; Banasiak, Krzysztof. (2019) Thermodynamic Performance Investigation of Commercial R744 Booster Refrigeration Plants Based on Advanced Exergy Analysis. Energies. volum 12.
  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. volum 12 (3).
  Academic article
• Hafner, Armin. (2019) The advantages of natural working fluids. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
  Academic chapter/article/Conference paper
• Hafner, Armin; Gabrielii, Cecilia H; Widell, Kristina Norne. (2019) Refrigeration units in marine vessels Alternatives to HCFCs and high GWP HFCs. Nordisk ministerråd. 2019. ISBN 978-92-893-5940-5. TemaNord (527).
  Report
• Hafner, Armin; Pardiñas, Ángel Á.. (2019) CO2 refrigeration technology: Possible innovations. Science et technique du froid. volum 2019-April.
  Academic article
• Haida, Michal; Smolka, Jacek; Hafner, Armin; Palacz, Michal; Ostrowski, Zeimowit; Bodys, Jakub; Kriezi, Ekaterini E.; Försterling, Sven; Nowak, Andrzej J.; Banasiak, Krzysztof. (2019) Performance operation of liquid ejectors for a R744 integrated multi-ejector supermarket system using a hybrid ROM. International journal of refrigeration. volum 110.
  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
• 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. volum 2019-April.
  Academic article
• 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. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
  Academic chapter/article/Conference paper
• 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. volum 173.
  Academic article
• Ringstad, Knut Emil; Allouche, Yosr; Gullo, Paride; Banasiak, Krzysztof; Hafner, Armin. (2019) CO2 ejector modelling using CFD: current status. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
  Academic chapter/article/Conference paper
• Ringstad, Knut Emil; Hafner, Armin; Allouche, Yosr. (2019) Investigation of CFD models for ammonia ejector design. 8th Conference on Ammonia and CO2 Refrigeration Technologies, Proceedings.
  Academic chapter/article/Conference paper
• 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. 8th Conference on Ammonia and CO2 Refrigeration Technologies, Proceedings.
  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. Eurotherm Seminar #112 - Advances in Thermal Energy Storage.
  Academic chapter/article/Conference paper
• Selvnes, Håkon; Hafner, Armin; Kauko, Hanne. (2019) Design of a cold thermal energy storage unit for industrial applications using CO2 as refrigerant. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
  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
• Smitt, Silje Marie; Hafner, Armin. (2019) Numerical performance investigation of a CO2 heat pump and refrigeration system for a Nordic hotel. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
  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. 8th Conference on Ammonia and CO2 Refrigeration Technologies, Proceedings.
  Academic chapter/article/Conference paper
• Taguas Garzon, Francisco Javier; Hafner, Armin. (2019) Heat pumps for energy efficient breweries. Science et technique du froid. volum 2019-April.
  Academic article
• Verlaat, B; Petagna, P.; Zwalinski, L; Daguin, J.; Giakoumi, D.; Bhanot, V; Battistin, M; Hafner, Armin; Collot, J; Bondoux, Dominique; Postema, H; Tropea, P; Blust, Stefanie; Hanf, P; Pardiñas, Ángel Á.. (2019) CO2 cooling challenges at CERN for the future phase 2 upgrade program. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
  Academic chapter/article/Conference paper
• 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. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
  Academic chapter/article/Conference paper
• Widell, Kristina Norne; Dhakal, Pranab Raj; Thakur, Maitri; Hafner, Armin. (2019) Refrigeration to prevent food losses. Proceedings of the 25th IIR International Congress of Refrigeration. Montréal, Canada, August 24-30, 2019.
  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. volum 1.
  Article

2018

• 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
• 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. volum 161.
  Academic article
• Dhakal, Pranab Raj; Widell, Kristina Norne; Hafner, Armin. (2018) Mapping of cold chains in Nepal. 5th IIR Conference on Sustainability and the Cold Chain : proceedings.
  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. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
  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. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
  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. volum 93.
  Academic literature review
• Gullo, Paride; Hafner, Armin; Banasiak, Krzysztof; Minetto, Silvia. (2018) A review on recent technological advancements in muliti-ejector concept. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
  Academic chapter/article/Conference paper
• 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. 5th IIR Conference on Sustainability and the Cold Chain : proceedings.
  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. 5th IIR Conference on Sustainability and the Cold Chain : proceedings.
  Academic chapter/article/Conference paper
• 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. volum 164.
  Academic article
• Hafner, Armin; Kvalsvik, Karoline Husevåg. (2018) Direct CO2-ground condensers. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
  Academic chapter/article/Conference paper
• Hafner, Armin; Nekså, Petter. (2018) Integrated CO2 solutions for supermarkets. Science et technique du froid. volum 2018-June.
  Academic article
• Haida, Michal; Smolka, Jacek; Hafner, Armin; Mastrowski, Mikolaj; Madsen, Kenneth B.; Nowak, Andrzej J.; Banasiak, Krzysztof. (2018) Heat Transfer Process Within The R744 Two-phase Ejector: Numerical And Experimental Study. 17th International Refrigeration and Air Conditioning Conference 2018.
  Academic chapter/article/Conference paper
• Haida, Michal; Smolka, Jacek; Hafner, Armin; Mastrowski, Mikolaj; Palacz, Michal; Madsen, Kenneth B.; Nowak, Andrzej J.; Banasiak, Krzysztof. (2018) Numerical investigation of heat transfer in a CO2 two-phase ejector. Energy. volum 163.
  Academic article
• Haida, Michal; Smolka, Jacek; Hafner, Armin; Palacz, Michal; Ostrowski, Zeimowit; Madsen, Kenneth B.; Försterling, Sven; Nowak, Andrzej J.; Banasiak, Krzysztof. (2018) The R744 multi-ejector hybrid CFD and experimentally-based reduced-order model. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
  Academic chapter/article/Conference paper
• Haida, Michal; Smołka, Jacek; Hafner, Armin; Ostrowski, Zeimowit; Palacz, Michał; Madsen, Kenneth B.; Försterling, Sven; Nowak, Andrzej J.; Banasiak, Krzysztof. (2018) Performance mapping of the R744 ejectors for refrigeration and air conditioning supermarket application: A hybrid reduced-order model. Energy. volum 153.
  Academic article
• Kvalsvik, Karoline Husevåg; Hafner, Armin. (2018) Integrated heating and cooling CO2 heat pump system in a modern distribution centre. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
  Academic chapter/article/Conference paper
• Pardiñas, Ángel Á.; Hafner, Armin; Banasiak, Krzysztof. (2018) Integrated R744 ejector supportet parallel compression racks for supermarkets : experimental results. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
  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. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
  Academic chapter/article/Conference paper
• Selvnes, Håkon; Hafner, Armin. (2018) Energy distribution concepts for Urban Supermarkets including energy hubs. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
  Academic chapter/article/Conference paper
• Selvnes, Håkon; Hafner, Armin; Kauko, Hanne. (2018) Cold thermal storage integration in a large industrial refrigeration system. Proceedings of the 13th IIR Gustav Lorentzen Conference, Valencia, 2018.
  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. 12th IIR/IIF International Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning - PCM 2018 : book of proceedings.
  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
• Smitt, Silje Marie; Hafner, Armin. (2018) Integrated energy concepts for high performance hotel buildings. Science et technique du froid. volum 2018-June.
  Academic article

2017

• Bodys, Jakub; Palacz, Michal; Haida, Michal; Smolka, Jacek; Nowak, Andrzej J.; Banasiak, Krzysztof; Hafner, Armin. (2017) Full-scale multi-ejector module for a carbon dioxide supermarket refrigeration system: Numerical study of performance evaluation. Energy Conversion and Management. volum 138.
  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. volum 20 (4).
  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. volum 75.
  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. volum 123.
  Academic article
• Haida, Michal; Smolka, Jacek; Hafner, Armin; Ostrowski, Zeimowit; Palacz, Michal; Nowak, Andrzej J.; Banasiak, Krzysztof. (2017) System model derivation of the CO2 two-phase ejector based on the CFD-based reduced-order model. Energy. volum 144.
  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. volum 85.
  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. 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
• 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. 7th Conference on Ammonia and CO2 Refrigeration Technology, Ohrid, Macedonia, May 11-13, 2017.
  Academic chapter/article/Conference paper
• 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. volum 139.
  Academic article
• Kvalsvik, Karoline Husevåg; Banasiak, Krzysztof; Hafner, Armin. (2017) Integrated CO₂ refrigeration and AC unit for hot climates. 7th Conference on Ammonia and CO2 Refrigeration Technology, Ohrid, Macedonia, May 11-13, 2017.
  Academic chapter/article/Conference paper
• 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. volum 115.
  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. volum 131.
  Academic article
• Pardiñas, Ángel Á.; Hafner, Armin; Banasiak, Krzysztof; Larsen, L.. (2017) Performance test methodology for the LCCP determination of supermarket and other integrated systems. 7th Conference on Ammonia and CO2 Refrigeration Technology, Ohrid, Macedonia, May 11-13, 2017.
  Academic chapter/article/Conference paper
• Tsamos, Konstantinos; Gullo, Paride; Ge, Yunting; Santosa, IDewa; Santosa, *; Tassou, Savvas A.; Hafner, Armin. (2017) Performance investigation of the CO2 gas cooler designs and its integration with the refrigeration system. Energy Procedia. volum 123.
  Academic article

2016

• 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. volum Part F126956.
  Academic article
• Bodys, Jakub; Palacz, Michal; Haida, Michal; Smolka, Jacek; Nowak, Andrzej J.; Banasiak, Krzysztof; Hafner, Armin. (2016) Parallel Work of CO2 Ejectors Installed in a Multi-Ejector Module of Refrigeration System. Journal of Physics: Conference Series (JPCS). volum 745 (3).
  Academic article
• Bodys, Jakub; Palacz, Michal; Smolka, Jacek; Haida, Michal; Bulinski, Zbigniew; Nowak, Andrzej J.; Fic, Adam; Banasiak, Krzysztof; Hafner, Armin. (2016) 3-D CFD modelling of multi-ejector module performance. 12th IIR Gustav Lorentzen Conference on Natural Refrigerants GL2016 : Proceedings.
  Academic chapter/article/Conference paper
• Bodys, Jakub; Smolka, Jacek; Palacz, Michal; Haida, Michal; Banasiak, Krzysztof; Nowak, Andrzej J.; Hafner, Armin. (2016) Performance of fixed geometry ejectors with a swirl motion installed in a multi-ejector module of a CO2 refrigeration system. Energy. volum 117.
  Academic article
• Fidorra, N; Minetto, Silvia; Hafner, Armin; Banasiak, Krzysztof; Köhler, J.. (2016) Analysis of cold thermal energy storage concepts in CO2 refrigeration systems. 12th IIR Gustav Lorentzen Conference on Natural Refrigerants GL2016 : Proceedings.
  Academic chapter/article/Conference paper
• Hafner, Armin. (2016) Dette bør du gjøre nå. klikk.no.
  Article
• Hafner, Armin; Banasiak, Krzysztof. (2016) Flexible R744-Gewerbekältelaboranlage: Kälte- und –Klimaanlagenkonfigurationen mit Ejektorunterstützung. Deutsche Kälte- und Klimatagung 2016 Kassel.
  Academic chapter/article/Conference paper
• Hafner, Armin; Banasiak, Krzysztof. (2016) Full scale supermarket laboratory R744 ejector supported & AC integrated parallel compression unit. 12th IIR Gustav Lorentzen Conference on Natural Refrigerants GL2016 : Proceedings.
  Academic chapter/article/Conference paper
• Hafner, Armin; Banasiak, Krzysztof. (2016) R744 ejector technology future perspectives. Journal of Physics: Conference Series (JPCS). volum 745 (3).
  Academic article
• Hafner, Armin; Banasiak, Krzysztof; Boeck, Lutz. (2016) R744 train HVAC unit. 12th IIR Gustav Lorentzen Conference on Natural Refrigerants GL2016 : Proceedings.
  Academic chapter/article/Conference paper
• Hafner, Armin; Banasiak, Krzysztof; Herdlitschka, Timo; Fredslund, Kristian; Girotto, Sergio; Haida, Michal; Smolka, Jacek. (2016) R744 ejector system case: Italian supermarket, Spiazzo. 12th IIR Gustav Lorentzen Conference on Natural Refrigerants GL2016 : Proceedings.
  Academic chapter/article/Conference paper
• Hafner, Armin; Boeck, Lutz; Banasiak, Krzysztof. (2016) Bahnklimatisierung mit R744 Anlagen. Deutsche Kälte- und Klimatagung 2016 Kassel.
  Academic chapter/article/Conference paper
• 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. volum 64.
  Academic article
• 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. 12th IIR Gustav Lorentzen Conference on Natural Refrigerants GL2016 : Proceedings.
  Academic chapter/article/Conference paper
• 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). volum 745:032159 (3).
  Academic article
• Haida, Michal; Smolka, Jacek; Palacz, Michal; Bodys, Jakub; Nowak, Andrzej J.; Bulinski, Zbigniew; Fic, Adam; Banasiak, Krzysztof; Hafner, Armin. (2016) Numerical investigation of an R744 liquid ejector for supermarket refrigeration systems. Thermal Science. volum 20 (4).
  Academic article
• Haukås, Hans T.; Stene, Jørn; Rekstad, Inge Håvard; Nekså, Petter; Hafner, Armin; Eikevik, Trygve Magne. (2016) CO2 (R744) som kuldemedium. 2016.
  Compendium
• 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
• Kriezi, Ekaterini E.; Fredslund, Kristian; Banasiak, Krzysztof; Hafner, Armin. (2016) R744 multi ejector development. Science et technique du froid. volum Part F126956.
  Academic article
• Manescu, Raluca Iolanda; Hafner, Armin. (2016) Energy Storage Possibilities for Supermarket Refrigeration Units. Deutsche Kälte- und Klimatagung 2016 Kassel.
  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
• Nowak, Andrzej J.; Palacz, Michal; Smolka, Jacek; Banasiak, Krzysztof; Bulinski, Zbigniew; Fic, Adam; Hafner, Armin. (2016) CFD simulations of transport phenomena during transcritical flow of real fluid (CO2) within ejector. International journal of numerical methods for heat & fluid flow. volum 26 (3-4).
  Academic article
• Palacz, Michal; Haida, Michal; Smolka, Jacek; Fic, Adam; Bulinski, Zbigniew; Nowak, Andrzej J.; Banasiak, Krzysztof; Hafner, Armin. (2016) An analysis of homogeneous relaxation model accuracy for the CO2 expansion inside the two-phase ejector. 12th IIR Gustav Lorentzen Conference on Natural Refrigerants GL2016 : Proceedings.
  Academic chapter/article/Conference paper
• 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). volum 745 (3).
  Academic article
• Palacz, Michal; Smolka, Jacek; Kus, Waclaw; Fic, Adam; Bulinski, Zbigniew; Nowak, Andrzej J.; Banasiak, Krzysztof; Hafner, Armin. (2016) CFD-based shape optimisation of a CO2 two-phase ejector mixing section. Applied Thermal Engineering. volum 95.
  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. volum 74.
  Academic article
• 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
• 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. 12th IIR Gustav Lorentzen Conference on Natural Refrigerants GL2016 : Proceedings.
  Academic chapter/article/Conference paper
• Smolka, Jacek; Palacz, Michal; Bodys, Jakub; Banasiak, Krzysztof; Fic, Adam; Bulinski, Zbigniew; Nowak, Andrzej J.; Hafner, Armin. (2016) Performance comparison of fixed- and controllable-geometry ejectors in a CO2 refrigeration system. International journal of refrigeration. volum 65.
  Academic article
• Smolka, Jacek; Palacz, Michal; Haida, Michal; Bodys, Jakub; Bulinski, Zbigniew; Nowak, Andrzej J.; Fic, Adam; Banasiak, Krzysztof; Hafner, Armin. (2016) A performance comparison of fixed ejectors with and without a swirl generator and controllable ejectors in a CO2 refrigeration system. 12th IIR Gustav Lorentzen Conference on Natural Refrigerants GL2016 : Proceedings.
  Academic chapter/article/Conference paper
• Widell, Kristina Norne; Hafner, Armin; Nordtvedt, Tom Ståle. (2016) Kühlung von pelagischem Fisch - im Fokus: Blauer Wittling -. Deutsche Kälte- und Klimatagung 2016 Kassel.
  Academic chapter/article/Conference paper

2015

• Banasiak, Krzysztof; Hafner, Armin; Eikevik, Trygve Magne. (2015) Experimental characteristics of R744 ejectors for expansion work recovery in heat pumping installations. Proceedings of the 24th International Congress of Refrigeration.
  Academic chapter/article/Conference paper
• Banasiak, Krzysztof; Hafner, Armin; Kriezi, Ekaterini E.; Madsen, Kenneth B.; Birkelund, Michael; Fredslund, Kristian; Olsson, Rickard. (2015) Development and performance mapping of a multi-ejector expansion work recovery pack for R744 vapour compression units. International journal of refrigeration. volum 57.
  Academic article
• Banasiak, Krzysztof; Hafner, Armin; Palacz, Michal. (2015) State of the art in the identification of two-phase transonic flow phenomena in transcritical CO2 ejectors. Proceedings of the 24th International Congress of Refrigeration.
  Academic chapter/article/Conference paper
• Banasiak, Krzysztof; Hafner, Armin; Steiner, A.. (2015) COP improvement of two-stage ammonia heat pumps by use of ejector. Ammonia and CO2 Refrigeration Technologies - Ohrid, Macedonia April 16-18, 2015 - Proceedings.
  Academic chapter/article/Conference paper
• Banasiak, Krzysztof; Hafner, Armin; Widell, Kristina Norne. (2015) Blast freezers (Part 1) R717 versus R717 / R744 cascade. Ammonia and CO2 Refrigeration Technologies - Ohrid, Macedonia April 16-18, 2015 - Proceedings.
  Academic chapter/article/Conference paper
• Banasiak, Krzysztof; Hafner, Armin; Widell, Kristina Norne. (2015) Blast freezers (Part 2) R717 versus R744. Ammonia and CO2 Refrigeration Technologies - Ohrid, Macedonia April 16-18, 2015 - Proceedings.
  Academic chapter/article/Conference paper
• Clauss, John; Kauko, Hanne; Hafner, Armin; Eikevik, Trygve Magne. (2015) Wärmepumpen als Teil eines Smart Thermal Grids. Deutsche Kälte- und Klimatagung 2015 Dresden.
  Academic chapter/article/Conference paper
• Fidorra, N; Hafner, Armin; Minetto, Silvia; Kohler, J.. (2015) Low temperature heat storages in CO2 supermarket refrigeration systems. Proceedings of the 24th International Congress 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. Ammonia and CO2 Refrigeration Technologies - Ohrid, Macedonia April 16-18, 2015 - Proceedings.
  Academic chapter/article/Conference paper
• Hafner, Armin. (2015) 2020 perspectives for CO2 refrigeration and heat pump systems. Ammonia and CO2 Refrigeration Technologies - Ohrid, Macedonia April 16-18, 2015 - Proceedings.
  Academic chapter/article/Conference paper
• Hafner, Armin; Fredslund, K.; Banasiak, Krzysztof. (2015) Next generation R744 refrigeration technology for supermarkets. Proceedings of the 24th International Congress of Refrigeration.
  Academic chapter/article/Conference paper
• Hafner, Armin; Fredslund, Kristian; Banasiak, Krzysztof. (2015) R744 Ejektor Kältetechnik für Supermärkte. Deutsche Kälte- und Klimatagung 2015 Dresden.
  Chapter
• Hafner, Armin; Hemmingsen, Anne Karin. (2015) R744 refrigeration technologies for supermarkets in warm climates. Proceedings of the 24th International Congress of Refrigeration.
  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
• 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
• 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. Ammonia and CO2 Refrigeration Technologies - Ohrid, Macedonia April 16-18, 2015 - Proceedings.
  Academic chapter/article/Conference paper
• Palacz, Michal; Smolka, Jacek; Fic, Adam; Bulinski, Zbigniew; Nowak, Andrzej J.; Banasiak, Krzysztof; Hafner, Armin. (2015) Application range of the HEM approach for CO2 expansion inside two-phase ejectors for supermarket refrigeration systems. International journal of refrigeration. volum 59.
  Academic article
• Palacz, Michal; Smolka, Jacek; Fic, Adam; Bulinski, Zbigniew; Nowak, Andrzej J.; Banasiak, Krzysztof; Hafner, Armin. (2015) CDF-based shape optimisation of two-phase ejector for R744. Proceedings of the 24th International Congress of Refrigeration.
  Academic chapter/article/Conference paper

2014

• Banasiak, Krzysztof; Hafner, Armin; Eikevik, Trygve Magne; Haddal, Olav Martin. (2014) CFD Case Study of R744 ejectors. Proceedings of the 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014.
  Academic chapter/article/Conference paper
• Banasiak, Krzysztof; Hafner, Armin; Haddal, Olav Martin; Eikevik, Trygve Magne. (2014) Test facility for a multiejector R744 refrigeration system. Proceedings of the 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014.
  Academic chapter/article/Conference paper
• Banasiak, Krzysztof; Palacz, Michal; Hafner, Armin; Bulinski, Zbigniew; Smolka, Jacek; Nowak, Andrzej J.; Fic, Adam. (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. volum 40.
  Academic article
• Bantle, Michael; Tolstorebrov, Ignat; Hafner, Armin. (2014) Energierückgewinnung mittels Brüden-Kompression in Trocknungssystemen mit überhitztem Dampf. DKV-Tagungsbericht 2014 Düsseldorf - 19. – 21. November 2014.
  Academic chapter/article/Conference paper
• Fidorra, N; Hafner, Armin; Minetto, Silvia; Kohler, J. (2014) Applications of the supersmart energy-benchmark tool for supermarkets. Proceedings of the 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014.
  Academic chapter/article/Conference paper
• Fidorra, N; Hafner, Armin; Minetto, Silvia; Köhler, Jochen. (2014) Simulation models in the supersmart supermarket - energy-benchmark tool. 3rd IIR International Conference on Sustainability and the Cold Chain 23rd 24th and 25th June 2014, St Mary’s University, Twickenham, London, UK.
  Academic chapter/article/Conference paper
• Hafner, Armin; Banasiak, Krzysztof. (2014) Versuchsstand für ein Multi-Ejektor R744 Kühlsystem. DKV-Tagungsbericht 2014 Düsseldorf - 19. – 21. November 2014.
  Academic chapter/article/Conference paper
• Hafner, Armin; Claussen, Ingrid Camilla; Schmidt, F.; Olsson, R.; Fredslund, K.; Eriksen, P.A.; Madsen, K.B.. (2014) Efficient and integrated energy systems for supermarkets. Proceedings of the 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014.
  Academic chapter/article/Conference paper
• Hafner, Armin; Försterling, Sven; Banasiak, Krzysztof. (2014) Multi-ejector concept for R-744 supermarket refrigeration. International journal of refrigeration. volum 43.
  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; Hemmingsen, Anne Karin; Van de Ven, Adinda. (2014) R744 refrigeration system configurations for supermarkets in warm climates. 3rd IIR International Conference on Sustainability and the Cold Chain 23rd 24th and 25th June 2014, St Mary’s University, Twickenham, London, UK.
  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
• 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. Proceedings of the 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014.
  Academic chapter/article/Conference paper
• Hafner, Armin; Schönenberger, Jonas; Banasiak, Krzysztof; Girotto, Sergio. (2014) R744 Ejector supported parallel vapour compression system. 3rd IIR International Conference on Sustainability and the Cold Chain 23rd 24th and 25th June 2014, St Mary’s University, Twickenham, London, UK.
  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
• Schönenberger, Jonas; Hafner, Armin; Banasiak, Krzysztof; Girotto, Sergio. (2014) Experience with ejectors implemented in a R744 booster system operating in a supermarket. Proceedings of the 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014.
  Academic chapter/article/Conference paper
• Stavset, Ole; Banasiak, Krzysztof; Hafner, Armin. (2014) Analysis of high temperature heat pumps applying natural working fluids. Proceedings of the 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014.
  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. Proceedings of the 11th IIR-Gustav Lorentzen Conference on Natural Refrigerants GL2014.
  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. volum 35 (6-8).
  Academic article
• Wiedenmann, Erik; Schönenberger, Jonas; Hafner, Armin; Banasiak, Krzysztof; Girotto, Sergio. (2014) Effiziente Kälteerzeugung im Supermarkt mittels CO2-Booster-Kälteanlage und Ejektor. DKV-Tagungsbericht 2014 Düsseldorf - 19. – 21. November 2014.
  Chapter
• 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. 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

• 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. volum 51 (1-2).
  Academic article
• Banasiak, Krzysztof; Hafner, Armin; Hemmingsen, Anne Karin. (2013) Influence of ejector performance on the overall efficiency of ammonia ejector refrigeration cycle. Ammonia Refrigeration Technology. Proceedings: Ohrid, Macedonia, May 9-11, 2013.
  Academic chapter/article/Conference paper
• Banasiak, Krzysztof; Palacz, Michal; Hafner, Armin; Bulinski, Zbigniew; Smolka, Jacek; Nowak, Andrzej J.; Fic, Adam. (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. volum 40.
  Academic article
• Beuttel, Tobias; Eikevik, Trygve Magne; Hafner, Armin. (2013) Analyse der Unterkühlung unter Verwendung verschiedener ein- und zweiphasiger Propylenglykol Lösungen. Deutsche Kälte-Klima-Tagung 2013 Hannover.
  Chapter
• Fidorra, Nicolas; Hafner, Armin; Lemke, Nicholas; Köhler, Jürgen. (2013) Supersmart-Energiebenchmarktool für Supermärkte. Deutsche Kälte-Klima-Tagung 2013 Hannover.
  Academic chapter/article/Conference paper
• Friess, Yannick; Eikevik, Trygve Magne; Hafner, Armin. (2013) Analyse der Unterkühlung wässriger Lösungen mit verschiedenen Additiven und Wärmeübertrageroberflächen. Deutsche Kälte-Klima-Tagung 2013 Hannover.
  Chapter
• 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
• Hafner, Armin; Schmälzle, Christian; Claussen, Ingrid Camilla; Schundelmeier, Jens. (2013) Leistungsmessungen: R744 Verdichter, 380cm3 Hubvolumen. Deutsche Kälte-Klima-Tagung 2013 Hannover.
  Chapter
• Heyse, Christoph; Hafner, Armin; Eikevik, Trygve Magne. (2013) Hochtemperatur-Absorptionswärmepumpen. Deutsche Kälte-Klima-Tagung 2013 Hannover.
  Chapter
• 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. volum 59 (1-2).
  Academic article
• 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
• Rohde, Daniel; Hafner, Armin. (2013) Verbrauchsanalyse von PKW-Klimaanlagen : Berechnung des jährlichen Verbrauchs mit dynamischen Simulationsmodellen. Deutsche Kälte-Klima-Tagung 2013 Hannover.
  Chapter
• Schönenberger, Jonas; Hafner, Armin; Banasiak, Krysztof; Girotto, Sergio. (2013) Effiziente Kälteerzeugung im Supermarkt mittels CO2-Booster-Kälteanlage und Ejektor. Deutsche Kälte-Klima-Tagung 2013 Hannover.
  Chapter
• Schwan, Johannes; Boeck, Lutz; Hafner, Armin. (2013) Untersuchung von Ausführungsmöglichkeiten einer CO2-Klimaanlage für ein Regionalverkehrsfahrzeug. Deutsche Kälte-Klima-Tagung 2013 Hannover.
  Chapter
• 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. volum 37 (3).
  Academic article
• Titze, Maren; Lemke, Nicholas; Hafner, Armin; Köhler, Jürgen. (2013) Entwicklung und Simulation Luftaufbereitungs- und Kälteanlageanlage im Supermarkt mit Wärmerückgewinnung. Deutsche Kälte-Klima-Tagung 2013 Hannover.
  Chapter
• Van de Ven, Adinda; Hafner, Armin; Eikevik, Trygve Magne. (2013) Bewertung von weiterentwickelten R744 Supermarktkälteanlagen für warme Klimazonen. Deutsche Kälte-Klima-Tagung 2013 Hannover.
  Chapter

2012

• Albert, Daniel; Nordtvedt, Tom Ståle; Hafner, Armin; Ladam, Yves; Cibis, Dominik. (2012) Design of a hear recovery system in an aluminium casthouse. Deutsche Kälte-Klima-Tagung 2012 Würzburg.
  Academic chapter/article/Conference paper
• 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. volum 35 (6).
  Academic article
• Banasiak, Krysztof; Hafner, Armin. (2012) Mathematical modeling of the phase transition processes with metastability effects for transcritical R744 converging-diverging nozzles. Proceedings of 10th IIR Gustav Lorentzen Conference, June 25 - 27 2012 Delft, the Netherlands.
  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. Proceedings of 10th IIR Gustav Lorentzen Conference, June 25 - 27 2012 Delft, the Netherlands.
  Academic chapter/article/Conference paper
• Denecke, Julius; Hafner, Armin; Eikevik, Trygve Magne; Ladam, Yves. (2012) Heat Recovery Solutions for R744 Booster Commercial Refrigeration Systems. Proceedings of 10th IIR Gustav Lorentzen Conference, June 25 - 27 2012 Delft, the Netherlands.
  Academic chapter/article/Conference paper
• Hafner, Armin; Claussen, Ingrid Camilla; Schmälzle, Christian; Obrist, Frank. (2012) Hocheffizienter R744 Verdichter mit 380 cm3 Hubvolumen. Deutsche Kälte-Klima-Tagung 2012 Würzburg.
  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. volum 102 (1120).
  Article
• Hafner, Armin; Försterling, Sven; Banasiak, Krzysztof. (2012) Multi-Ejektoren Konzept für R-744 Supermarkt-Kälteanlagen. Deutsche Kälte-Klima-Tagung 2012 Würzburg.
  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
• 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
• Hennig, Jakob; Hafner, Armin; Eikevik, Trygve Magne. (2012) Solare Kühlsysteme – Klassifizierung und energetische Bewertung. Deutsche Kälte-Klima-Tagung 2012 Würzburg.
  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. Proceedings of 10th IIR Gustav Lorentzen Conference, June 25 - 27 2012 Delft, the Netherlands.
  Academic chapter/article/Conference paper
• Nordtvedt, Tom Ståle; Hafner, Armin. (2012) Integration of refrigeration and HVAC in supermarkets. Proceedings of 10th IIR Gustav Lorentzen Conference, June 25 - 27 2012 Delft, the Netherlands.
  Academic chapter/article/Conference paper
• Prosi, Nicolai; Eikevik, Trygve Magne; Hafner, Armin. (2012) Analyse der Underkühlung von wässrigen Lösungen mit verschiedenen Additiven und Mischverhältnissen. Deutsche Kälte-Klima-Tagung 2012 Würzburg.
  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. 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
• 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. volum 16 (7).
  Academic literature review

2011

• Banasiak, Kristof; Hafner, Armin; Andresen, Trond. (2011) Experimental and numerical investigation on R744 ejector geometry. Proceedings of the 23rd International Congress of Refrigeration.
  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. volum 50 (11).
  Academic article
• Denecke, Julius; Hafner, Armin. (2011) Efficiency improvement of Commercial Refrigeration Systems. Deutsche Kälte-Klima-Tagung 2011 Achen.
  Academic chapter/article/Conference paper
• Hafner, Armin. (2011) ENVIRONMENTAL IMPACT OF HEAT PUMPING SYSTEMS. Actes du ... Congres international du froid. volum 23.
  Academic article
• Hafner, Armin. (2011) Environmental impact of heat pumping systems. Proceedings of the 23rd International Congress of Refrigeration.
  Academic chapter/article/Conference paper
• Hafner, Armin. (2011) Laboratory investigation of different ejector geometries for R744 transcritical systems. International Journal of Air-Conditioning and Refrigeration. volum 19 (3).
  Academic article
• Hafner, Armin. (2011) Ölfreie Wärmepumpenanlagen mit R744 (CO2). Deutsche Kälte-Klima-Tagung 2011 Achen.
  Academic chapter/article/Conference paper
• 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. volum 23.
  Academic article
• Hafner, Armin; Försterling, Sven; Andreassen, Hanne Elisabeth Bø; Walnum, Harald Taxt. (2011) Air reversing HVAC unit for public trains. Proceedings of the 23rd International Congress of Refrigeration.
  Academic chapter/article/Conference paper
• Hafner, Armin; Försterling, Sven; Bothe, Franziska. (2011) Simulation von R744 Turboverdichtern. Deutsche Kälte-Klima-Tagung 2011 Achen.
  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
• Hafner, Armin; Nekså, Petter; Ladam, Yves; Eikevik, Trygve Magne. (2011) Oljefrie CO2 systemer for industrielle og kommersielle anvendelser. Kulde.
  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. volum 1 (1).
  Academic article

2010

• Banasiak, Krzysztof; Hafner, Armin; Smolka, Jacek. (2010) 1-D computational model of a motive nozzle for the R744 two-phase ejector. 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids.
  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
• Rumpf, Ingrid D; Hafner, Armin. (2010) Feasibility study of CO2 accumulation. 2010. ISBN 9788259434500.
  Report

2009

• Hafner, Armin. (2009) B-COOL Project - Ford Ka and Fiat Panda R-744 MAC systems. SAE World Congress & Exhibition. Session: Thermal Systems Components.
  Academic chapter/article/Conference paper

2008

• Hafner, Armin. (2008) Air reversing R744 conditioning system. 8th IIR Gustav Lorentzen Conference on Natural Working Fluids.
  Academic chapter/article/Conference paper

2007

• Drescher, Michael; Hafner, Armin; Jakobsen, Arne. (2007) Experimental investigation of an ejector for R-744 transcritical systems. Proceedings : 22nd International Congress of Refrigeration : Refrigeration creates the future.
  Academic chapter/article/Conference paper
• Hafner, Armin. (2007) Design and parametric investigation on ejector for R-744 transcritical system. Proceedings : 22nd International Congress of Refrigeration : Refrigeration creates the future.
  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

2006

• Hafner, Armin. (2006) Construction of a CO2 pipeline test rig for R&D and operator training. 8th International Conference on Greenhouse Gas Control Technologies, Proceedings.
  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

2004

• Hafner, Armin. (2004) Life Cycle Climate Performance (LCCP) von Mobilen Kältenanlagen mit R-134a, R-152a und R-744. Deutsche Kälte-Klima-Tagung 2004 Bremen.
  Academic chapter/article/Conference paper
• Hafner, Armin. (2004) Major design issues for compact interior heat exchangers. 6th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2004).
  Academic chapter/article/Conference paper

2002

• Hafner, Armin. (2002) Compact heat exchangers for mobile CO2 systems. 5th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2002).
  Academic chapter/article/Conference paper

2000

• Hafner, Armin. (2000) Experimental study on heat pump operation of prototype CO2 mobile air conditioning system. 4th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2000).
  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. Deutsche Kälte-Klima-Tagung 1998 Würzburg.
  Academic chapter/article/Conference paper