Blar i NTNU Open på forfatter "Selvnes, Håkon"
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Investigation on heat recovery strategies from low temperature food processing plants: Energy analysis and system comparison
Ahrens, Marcel Ulrich; Selvnes, Håkon; Henke, Leon Hendrik; Bantle, Michael; Hafner, Armin (Chapter, 2021)Industrial food processing plants often have significant thermal requirements at both low and high temperatures. These plants can produce a variety of products including frozen, chilled and grilled/steamed foodstuff, ... -
Model-Based Investigation of Upgraded Thermal Energy System Designs of the Organic Dairy in Røros - with PCM-Storage Integration and Experimental Pressure Drop Analysis of Pillow Plates
Bless, Marco (Master thesis, 2023)Meierisektoren står overfor en verdensomspennende vekst som er knyttet til økte utslipp av klimagasser. For å sikre mattrygghet for en voksende befolkning i tider med klimaendringer, er bærekraftig produksjon av meieriprodukter ... -
Modeling of a CO2‐Based Integrated Refrigeration System for Supermarkets
Pardiñas, Ángel Á.; Jokiel, Michael; Schlemminger, Christian; Selvnes, Håkon; Hafner, Armin (Peer reviewed; Journal article, 2021)An integrated energy system that consists of a centralized refrigeration unit can deliver the entire HVAC&R (heating, ventilation, air conditioning, and refrigeration) demand for a supermarket. CO2 (R744) is a natural ... -
Next generation of ejector-supported R744 booster systems for commercial refrigeration at all climates
Pardiñas, Ángel Á.; Selvnes, Håkon; Banasiak, Krzysztof; Hafner, Armin (Peer reviewed; Journal article, 2023)The pernicious effects of synthetic refrigerants on different environmental aspects leave natural refrigerants as the only alternative for vapour compressions systems. Among natural refrigerants, CO2 (R744) has become the ... -
Numerical investigation of a CO2 cooling system connected to Spawn-of-energy-plus thermal zones
Elarga, Hagar; Selvnes, Håkon; Sevault, Alexis; Hafner, Armin (Peer reviewed; Journal article, 2022)Today, only about 25 % of the European building stock is considered energy efficient. Meanwhile, the implementation of CO2 as a refrigerant is considered one of the solutions to improve the overall building’s energy ... -
Parametric study of low-temperature thermal energy storage using carbon dioxide as the phase change material in pillow plate heat exchangers
Mastani Joybari, Mahmood; Selvnes, Håkon; Vingelsgård, Erling; Sevault, Alexis; Hafner, Armin (Peer reviewed; Journal article, 2023)Industrial low-temperature freezing applications are often batch processes, requiring a lot of energy, exerting stress on the electrical grid. To relieve this stress, thermal energy storage can be used. However, there is ... -
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 ... -
Review on cold thermal energy storage applied to refrigeration systems using phase change materials
Selvnes, Håkon; Allouche, Yosr; Manescu, Raluca Iolanda; Hafner, Armin (Peer reviewed; Journal article, 2021)This paper presents a thorough review on the recent developments and latest research studies on cold thermal energy storage (CTES) using phase change materials (PCM) applied to refrigeration systems. The presented study ... -
Two-stage evaporator for R744 heat pumps using greywater as heat source
Pardiñas, Ángel Á.; Kauko, Hanne Laura Pauliina; Hazarika, Mihir Mouchum; Selvnes, Håkon; Banasiak, Krzysztof; Hafner, Armin (Peer reviewed; Journal article, 2023)Heat pumps are pinpointed as a key technology in decarbonizing buildings' heat supply, which is currently dominated by fossil-fuel based systems. To minimize the environmental impact of heat pumps over their lifetime, ...