Blar i NTNU Open på forfatter "Tønsberg, Even Kristian"
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Modeling and simulation of oil-free liquid-injected screw compressors using ammonia-water mixture as working fluid
Ahrens, Marcel Ulrich; Tønsberg, Even Kristian; Tolstorebrov, Ignat; Hafner, Armin; Eikevik, Trygve Magne (Chapter, 2022)This study investigates the compression process of an oil-free screw compressor with liquid injection for an absorption-compression heat pump (ACHP) with an ammonia-water mixture as working fluid. In recent years, several ... -
Modeling Approach for a Liquid-Injected NH3-H2O Screw Compressor
Tønsberg, Even Kristian (Master thesis, 2020)Det er et stort behov for tiltak som kan fremme energieffektivitet i dagens samfunn grunnet stadig økende forbruk av energi og naturressurser. Varmepumpeteknologi er et kraftfullt verktøy for å redusere energiforbruk knyttet ... -
Modelling Approach for a Liquid-Injected Ammonia-Water Screw Compressor
Ahrens, Marcel Ulrich; Tønsberg, Even Kristian; Tolstorebrov, Ignat; Hafner, Armin; Eikevik, Trygve Magne (Chapter, 2021)The present work focuses on a modelling approach for a liquid-injected ammonia-water screw compressor for combined absorption-compression heat pumps (CACHP) at high-temperature operation. The CACHP system combines the ... -
Numerical investigation of an oil-free liquid-injected screw compressor with ammonia-water as refrigerant for high temperature heat pump applications
Ahrens, Marcel Ulrich; Tolstorebrov, Ignat; Tønsberg, Even Kristian; Hafner, Armin; Wang, Ruzhu; Eikevik, Trygve Magne (Peer reviewed; Journal article, 2022)This study investigates a numerical model of an oil-free twin screw compressor with an ammonia-water mixture as refrigerant and liquid injection. The compressor was identified as the main constraint to increase the heat ...