Blar i SINTEF Open på forfatter "Nekså, Petter"
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Multiejector CO2 cooling system with evaporative gascooler for a supermarket application in tropical regions
Singh, Simarpreet; Hafner, Armin; Maiya, M.P.; Banasiak, Krzysztof; Nekså, Petter (Peer reviewed; Journal article, 2021)In the present study, the performance of a 33 kW multiejector trans-critical CO2 cooling system is experimentally evaluated for a supermarket application with/without internal heat exchanger and evaporative cooling. In ... -
Natural refrigerants for low temperature power cycles
Shahrooz, Mina; Lundqvist, Per; Nekså, Petter (Science et technique du froid;2018-3, Chapter; Peer reviewed, 2018) -
Particle deposition characteristics in the formation of Hard Grey Scale (HGS) on cold surfaces exposed to aluminium production off-gas
Clos, Daniel Perez; Zedel, Hannes; Johnsen, Sverre Gullikstad; Nekså, Petter; Aune, Ragnhild Elizabeth (Peer reviewed; Journal article, 2021)Hard Grey Scale (HGS) is a hard and strongly adhering fouling material that forms on solid surfaces impinged by the off-gas generated in the pot cells of aluminium production plants. Different theories on HGS formation ... -
Performance evaluation of CO2 ejector system with parallel compressor for supermarket application
Singh, Simarpreet; Banasiak, Krzysztof; Hafner, Armin; Maiya, M.P.; Nekså, Petter (Chapter, 2018)Evolution in modifications for CO2 system configuration came across from the last two decades has proven to hold the potential in order to improve the overall performance of the CO2 cooling system for various applications. ... -
Performance Evaluation of Ejector Based CO₂ System for Simultaneous Heating and Cooling Application in an Indian Dairy Industry
Koti, Dasi; Singh, Simarpreet; Guruchethan, A.M.; Maiya, M.P.; Hafner, Armin; Banasiak, Krzysztof; Nekså, Petter (Peer reviewed; Journal article, 2020)India is ranked first in milk production, and its goal is to increase annual production to 300 million tons by 2024. The dairy industry requires multi-temperature cooling and simultaneous heating. In the present study, the ... -
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 of binary zeotropic mixtures in organic Rankine cycles (ORCs)
Shahrooz, Mina; Lundqvist, Per; Nekså, Petter (Peer reviewed; Journal article, 2022)Compared to pure fluids, zeotropic mixtures have the potential to lower the irreversibilities in low temperature Rankine cycles by better temperature profile matching of the working fluid with the heat source/sink. However, ... -
Performance of high temperature heat pump for simultaneous and efficient production of ice water and process heat
Schlemminger, Christian; Svendsen, Eirik Starheim; Foslie, Sverre Stefanussen; Bantle, Michael; Bamigbetan, Opeyemi Olayinka; Nekså, Petter (Actes du ... Congres international du froid;ICR2019, Chapter; Peer reviewed, 2019) -
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) -
Reducing the exergy destruction in the cryogenic heat exchangers of hydrogen liquefaction processes
Wilhelmsen, Øivind; Berstad, David Olsson; Aasen, Ailo; Nekså, Petter; Skaugen, Geir (Journal article; Peer reviewed, 2018) -
Review of Vapour Compression Heat Pumps for High Temperature Heating using Natural Working Fluids
Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael (Journal article; Peer reviewed, 2017)The use of high temperature heat pumps (HTHPs) operating with natural fluids has been shown to be a potential environmentally friendly solution to increase energy efficiency in industrial processes. Industrial processes ... -
Solar heat recovery system using CO2 as working fluid
Yamasaki, Haruhiko; Wakimoto, Hiroyuki; Yamaguchi, Hiroshi; Nekså, Petter (Science et technique du froid;, Chapter, 2020)This article proposes a solar water heater system induced by natural convective flow using supercritical CO2 as a working fluid. The proposed solar water heater can produce thermal energy as hot water from solar thermal ... -
Theoretical analysis for charge reduction in a 200 kW hydrocarbon hight temperature heat pump
Bamigbetan, Opeyemi Olayinka; Eikevik, Trygve Magne; Nekså, Petter; Bantle, Michael; Schlemminger, Christian (Science et technique du froid;2018-3, Chapter; Peer reviewed, 2018) -
Thermal Characteristics in Supercritical CO2 Along Heating Tube
Tazawa, Taluya; Yoshida, S; Yamasaki, Haruhiko; Wakimoto, Hiroyuki; Yamaguchi, Hiroshi; Kamimura, Takeshi; Hattori, Kazuhiro; Nekså, Petter (Sciences et technique du froid;2020:14, Chapter; Peer reviewed, 2020)The system using CO2 as a refrigerant such as heat pump or Rankine cycle, depends greatly on the phase state and physical properties of CO2. In the present study, as a basic research on CO2 in the supercritical state, an ... -
Understanding the physical phenomena that occur inside heat exchanger for liquefaction of hydrogen
Wilhelmsen, Øivind; Skaugen, Geir; Berstad, David Olsson; Aasen, Ailo; Nekså, Petter (9782362150227;2017-3, Chapter; Peer reviewed, 2017) -
Visualization and Measurement of Swirling Flow of Dry Ice Particles in Cyclone Separator-Sublimator
Yamasaki, Haruhiko; Wakimoto, Hiroyuki; Kamimura, Takeshi; Hattori, Kazuhiro; Nekså, Petter; Yamaguchi, Hiroshi (Peer reviewed; Journal article, 2022)The dry ice sublimation process of carbon dioxide (CO2 ) is a unique, environmentally friendly technology that can achieve a temperature of −56 ◦C or lower, which is a triple point of CO2 in CO2 refrigeration systems. In ...