Blar i NTNU Open på forfatter "Eikevik, Trygve Magne"
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Investigation on CO2 Ground-coupled Heat Pumping System with Ejector
Morshed, Monjur (Master thesis, 2015)After the proposal of CO2 transcritical cycle in 1980s by Professor Gustav Lorentz, researchers have looked into theoretical and experimental research, as well as commercial system development to improve transcritical ... -
Low temperature drying and thermo-physical Properties of Brown seaweeds (Saccharina latissima)
Tolstorebrov, Ignat; Eikevik, Trygve Magne; Bantle, Michael (Chapter, 2017)The drying kinetics of brown seaweed Sacharina Latissima with and without blanching were investigated in temperature range between 10.0 and 38.0 °C. The drying process is more rapid for raw seaweeds. The effective moisture ... -
Machine learning methods for prediction of hot water demands in integrated R744 system for hotels
Zhang, Zhanluo; Smitt, Silje Marie; Eikevik, Trygve Magne; Hafner, Armin (Chapter, 2020)Load forecasting can help modern energy systems achieve more efficient operation by means of more accurate peak power shaving and more reliable control. This paper proposes a framework based on machine learning algorithms ... -
Minimering av energiforbruk i fremtidens supermarkeder
Klemsdal, Erik Junge (Master thesis, 2013)SammendragBakgrunn:Dagligvarebutikker er energikrevende bygninger som er ansvarlige for store mengder utslipp av klimagasser. For å redusere både energiforbruk og miljøpåvirkning fra disse bygningene har nye effektive ... -
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 ... -
Modeling the heating of the Green Energy Lab in Shanghai by the geothermal heat pump combined with the solar thermal energy and ground energy storage
Yu, Candice Yau May (Master thesis, 2012)This work involves the study of heating systems that combine solar collectors, geothermal heat pumps and thermal energy storage in the ground. Solar collectors can reduce the electricity use in these systems by reducing ... -
Modell for tidligfase design av RSW-system i bløggefartøy
Ivanov, Dimitar Zdravkov (Master thesis, 2021)Abstract will be available on 2024-11-01 -
Modellering og analyse av energisystem for en innendørs ishall
Olsen, Snorre Nordbo (Master thesis, 2015)Det skal bygges flere nye ishaller i Norge de kommende årene, blant annet nye Jordal Amfi. I lys av verdens klimautfordringer er det et tidsriktig energisystem som er planlagt i denne ishallen. Her benyttes det CO2 både ... -
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 ... -
Modelling of Ground Source Systems for Heat Pump Operations
Zhou, Hongyun (Master thesis, 2017)This thesis concerns the regional hydraulic and thermal interference between well doublets of ground source heat pump systems. The thesis falls into three parts of which the first focus on theoretical review of operating ... -
Mulighetsstudie for etablering av superkjølingslinje i slakteri
Austbø, Bjørn (Master thesis, 2011)Hensikten med denne studien har vært å kartlegge mulighetene for å etablere en superkjølt produksjonslinje for svinekjøtt på et slakteri. For å kunne vurdere mulighetene for å utnytte eksisterende kuldeanlegg, ble det ... -
New zeotropic CO<inf>2</inf>-based refrigerant mixtures for cascade high-temperature heat pump to reach heat sink temperature up to 180 °C
Palanichamy, Ganesan; Eikevik, Trygve Magne (Peer reviewed; Journal article, 2023)There is a great demand for clean, high-temperature heating in industries. The present work demonstrates the modeling and analysis of a high-temperature heat pump (HTHP) using a two-stage cascade refrigeration system with ... -
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 ... -
Numerical Simulations of Shell-Side Two-Phase Flow in Spiral-Wound Heat Exchanger - for Natural Gas Liquefaction
Thue, Dan-Hermann S (Master thesis, 2015)Heat transfer coefficients and pressure drop of evaporating heat exchangers such as the spiral wound heat exchanger depend on the distribution of the refrigerant fluid. However little open research is available in the study ... -
Numerical Study of Hydrocarbon Charge Reduction Methods in HVAC Heat Exchangers
Allymehr, Ehsan; Skaugen, Geir; Will, Torsten; Pardiñas, Ángel Á.; Eikevik, Trygve Magne; Hafner, Armin; Schnabel, Lena (Peer reviewed; Journal article, 2021)Required refrigerant charge in heat pump systems with propane is analyzed. Two systems are compared: The first a direct heat pump, with fin-and-tube heat exchangers, and the second an indirect system, with plate heat ... -
Offshore Rankine Cycles
Brandsar, Jo (Master thesis, 2012)The title of the thesis - "Offshore Rankine Cycles" - is very general and cover a large range of engineering fields, e.g. thermodynamic cycles (Rankine, ORC, Brayton, Kalina, etc.), mechanical equipment (gas/steam turbine, ... -
Oppvarming og varmegjenvinning i dagligvarebutikker
Nerum, Lars Kristian (Master thesis, 2012)Dagligvarebutikker i Norge er store brukere av energi. Som et ledd i å redusere energibehovet for sine nåværende og fremtidige butikker, har dagligvarekjeden REMA 1000 inngått et samarbeid med SINTEF Energi. Dette samarbeidet ... -
Optimal drift av energisystem i et supermarked
Johnsen, Arne Hogstad (Master thesis, 2013)Dagligvarebutikker er store forbrukere av energi. NTNU, SINTEF Energi og Rema 1000 er tre av mange industrideltagere i CREATIV prosjektet, et prosjekt for å energieffektivisere og redusere klimagassutslipp fra industri. ... -
Optimalisering av CO2-varmepumpe for kjøling av isvann / oppvarming av tappevann til 85°C
Berntsen, Malene Rustad (Master thesis, 2013)Masteroppgaven er en videreføring av et fordypningsprosjekt gjennomført av studenten høsten 2012. Masteroppgaven ble gjennomført ved Norges Tekniske og Naturvitenskapelige Universitet, institutt for energi- og prosessteknikk, ...