Blar i SINTEF Open på forfatter "Hafner, Armin"
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Performance improvements of supermarket R744 systems by pivoting compressor arrangements
Contiero, Luca; Fabris, F; Pardiñas, Ángel Á.; Hafner, Armin (Science et technique du froid;, Chapter; Peer reviewed, 2022)The adoption of the EU F-Gas regulation 517/2014 and the development of the Multi Ejector concept have led CO2 to take center stage as one of the preferred solutions in several applications, at the expense of synthetic ... -
Performance investigation of a multi-ejector R744 heat pump
Singh, Simarpreet; Reddy, Amshith; Prakash, Maiya P.; Banasiak, Krzysztof; Hafner, Armin; Nekså, Petter (Journal article; Peer reviewed, 2018) -
Performance mapping of the R744 ejectors for refrigeration and air conditioning supermarket application: A hybrid reduced-order model
Haida, Michal; Smolka, Jacek; Hafner, Armin; Ostrowski, Zeimowit; Palacz, Michal; Madsen, Kenneth B.; Försterling, Sven; Nowak, Andrzej J.; Banasiak, Krzysztof (Journal article; Peer reviewed, 2018)The continuous derivation of the ambient temperature and cooling demand in CO2 refrigeration and air-conditioning systems equipped with multi-ejector modules for supermarkets requires the analysis of the fixed ejector ... -
Performance of integrated R744 packs part 2 : ejectors performance, a comparison of data-driven model from onsite measurements with rom model predictions
Khorshidi, Vahid; Kriezi, Ekaterini E.; Schlemminger, Christian; Hafner, Armin (Sciences et technique du froid;2021/1, Peer reviewed; Journal article, 2021)Rising concerns for climate change impacts along with the new legislation aimed at lowering emissions indicates the inevitable transition in the cooling/heating industry towards a more energy-efficient solution with minimal ... -
Performance of integrated R744-packs part 1: compressor mass flow estimation based on data-driven models using analytical methods and actual field measurements
Khorshidi, Vahid; Kriezi, Ekaterini E.; Schlemminger, Christian; Hafner, Armin; Söylemez, Engin (Sciences et technique du froid;2021/1, Peer reviewed; Journal article, 2021)Rising concerns for climate change impacts along with the new legislation aimed at lowering emissions indicates the inevitable transition in the cooling/heating industry towards a more energy-efficient solution with minimal ... -
Performance operation of liquid ejectors for a R744 integrated multi-ejector supermarket system using a hybrid ROM
Haida, Michal; Smolka, Jacek; Hafner, Armin; Palacz, Michal; Ostrowski, Zeimowit; Bodys, Jakub; Kriezi, Ekaterini E.; Försterling, Sven; Nowak, Andrzej J.; Banasiak, Krzysztof (Peer reviewed; Journal article, 2019)Performance maps were generated for designed liquid ejectors installed in a multi-ejector module in an R744 integrated supermarket system using a hybrid of the reduced-order model (ROM). Hybrid ROMs of the investigated ... -
Performance test methodology for the LCCP determination of supermarket and other integrated systems
Pardiñas, Ángel Á.; Hafner, Armin; Banasiak, Krzysztof; Larsen, L. (Science et technique du froid;2017-2, Chapter; Peer reviewed, 2017) -
Phase change material thermal energy Storage for a large ammonia chiller/heat pump system
Jokiel, Michael; Kauko, Hanne; Schlemminger, Christian; Hafner, Armin; Claussen, Ingrid Camilla (Science et technique du froid;2017-2, Chapter; Peer reviewed, 2017) -
Phase change material thermal energy storage for a large scale ammonia chiller/heat pump system
Jokiel, Michael; Kauko, Hanne; Schlemminger, Christian; Hafner, Armin; Claussen, Ingrid Camilla (Chapter; Peer reviewed, 2017) -
Possible configurations of multiejector driven CO2 systems for Indian supermarkets
Blust, Stefanie; Hafner, Armin; Banasiak, Krzysztof; Nekså, Petter (Science et technique du froid;2018-3, Chapter; Peer reviewed, 2018) -
Potentials and challenges for pillow-plate heat exchangers: State-of-the-art review
Joybari, Mahmood Mastani; Selvnes, Håkon; Sevault, Alexis; Hafner, Armin (Peer reviewed; Journal article, 2022)For a long time, shell-and-tube heat exchangers have been the most common choice in the industry. Despite some limitations, their main advantage is that they have been extensively investigated and reliable design tools are ... -
R744 ejector technology future perspectives
Hafner, Armin; Banasiak, Krzysztof (Journal article; Peer reviewed, 2016)Carbon Dioxide, CO2 (R744) was one of the first commonly applied working fluids in the infancy of refrigeration more than 100 years ago. In contrast to ammonia it mainly disappeared after the first generation of synthetic ... -
R744 Refrigeration Solution for Small Supermarkets
Singh, Simarpreet; Pardiñas, Ángel Á.; Hafner, Armin; Schlemminger, Christian; Banasiak, Krzysztof (Science et technique du froid;, Chapter; Peer reviewed, 2021)Application based technology solution is nowadays preferred to achieve the performance of the cooling system configuration at its best. Therefore, benchmarking is an essential criterion which would add value to the optimum ... -
Refrigerated Transportation and Cold-chain Logistics in India – Current Status and Future Prospects
Gupta, Pradeep; Kumar, Pramod; Elarga, Hagar Hassan Hassanein Hassan; Hafner, Armin (Science et technique du froid;2023-4, Chapter; Peer reviewed, 2023)Reefer transportation has become an integral part of supply chain management for the shipment of temperature-sensitive goods. In a country as large and geographically diverse as India, refrigerated road transport is crucial ... -
Shape optimisation of a two-phase ejector for CO2 refrigeration systems
Palacz, Michal; Smolka, Jacek; Nowak, Andrzej J.; Banasiak, Krzysztof; Hafner, Armin (Journal article; Peer reviewed, 2016)The shape optimisation of four CO2 ejectors is presented in this study. The considered ejectors were originally designed for a multi-ejector supermarket CO2 refrigeration system. The objective function was formulated to ... -
Simultaneous implementation of rotary pressure exchanger and ejectors for CO2 refrigeration system
Saeed, Muhammad Zahid; Hafner, Armin; Thatte, Azam; Gabrielii, Cecilia H (Science et technique du froid;, Chapter; Peer reviewed, 2022)Natural refrigerant CO2 has become a viable choice for refrigeration units. The CO2 systems are working efficiently on land-based facilities, and their demand is increasing for offshore applications, e.g., cruise ships and ... -
Strategy for the control of two groups of ejectors operating in parallel in Integrated R744 refrigeration systems
Pardiñas, Ángel Á.; Hafner, Armin; Banasiak, Krzysztof; Kvalsvik, Karoline Husevåg; Larsen, Lars (Science et technique du froid;2018-3, Peer reviewed; Chapter, 2018) -
Strategy for the control of two groups of ejectors operating in parallel in Integrated R744 refrigeration systems
Pardiñas, Ángel Á.; Hafner, Armin; Banasiak, Krzysztof; Kvalsvik, Karoline Husevåg; Larsen, Lars (Science et technique du froid;2018-3, Peer reviewed; Chapter, 2018) -
Study on retaining natural refrigerant in seafood processing industries in India
Arun, B.S.; Kumar, Sumit; Murali, S.; Ninan, George; Samuel, Manoj P.; Widell, Kristina Marianne Norne; Singh, Simarpreet; Elarga, Hagar Hassan Hassanein Hassan; Hafner, Armin (Chapter, 2023)In the seafood processing sector in India, natural refrigerant such as NH3 is currently replaced by Freon refrigerants such as HFC-404A, because these systems are comparably more compact, operate above atmospheric pressure ... -
Sustainable production of fish protein hydrolysates: overall system architecture and footprint
Sherman, Prem Kumar; Tolstorebrov, Ignat; Widell, Kristina Marianne Norne; Hafner, Armin (Chapter, 2023)In this research work, the most efficient and energy-saving techniques for fish protein hydrolysates production were investigated from cradle-to-gate, in terms of overall cooling, heating, and energy demands. Advanced ...