Browsing NTNU Open by Author "Kvalsvik, Karoline Husevåg"

Now showing items 1-11 of 11

    • Direct CO2-ground condensers 

      Hafner, Armin; Kvalsvik, Karoline Husevåg (Chapter, 2018)
      The utilization of a direct condensing CO2 ground heat exchanger as an auxiliary heat rejection device for commercial or industrial refrigeration applications offers several advantages. During the cold season, and especially ...

    • Dynamic modeling of local district heating grids with prosumers: A case study for Norway 

      Kauko, Hanne; Kvalsvik, Karoline Husevåg; Rohde, Daniel; Nord, Natasa; Utne, Åmund (Journal article; Peer reviewed, 2018)
      District heating (DH) will play an important role in the future fossil-free energy systems by enabling increased utilization of waste heat and renewable heat sources to cover buildings' heat demand. A prerequisite for this ...

    • Dynamic modelling of local low-temperature heating grids: A case study for Norway 

      Kauko, Hanne; Kvalsvik, Karoline Husevåg; Rohde, Daniel; Hafner, Armin; Nord, Natasa (Journal article; Peer reviewed, 2017)
      Today's district heating (DH) networks in Norway are 2nd and 3rd generation systems, with supply temperatures ranging from 80 to 120 °C. In new developments, it is desirable to shift to 4th generation, low-temperature ...

    • Energy Efficient Drying Systems for the Dried Cured Meat Industry 

      Kvalsvik, Karoline Husevåg (Master thesis, 2015)
      Production of dry-cured meat requires large amounts of energy. To reduce the running costs in the dry-cured meat industry, which are closely related to the energy needs, eight energy systems for drying of meat were simulated ...

    • Inclusion of advection in fractures in the line source equation for analysis of thermal response tests 

      Kvalsvik, Karoline Husevåg; Holmberg, Henrik; Ramstad, Randi Kalskin; Midttømme, Kirsti (Peer reviewed; Journal article, 2024)
      Proper design of larger ground source heat pump installations, and borehole thermal energy storages (BTES) requires determination of on-site thermal properties of the ground by performing a thermal response test (TRT). The ...

    • Integrated heating and cooling CO2 heat pump system in a modern distribution centre 

      Kvalsvik, Karoline Husevåg; Hafner, Armin (Chapter, 2018)
      Industry is responsible for about 25-30 % of the global primary energy demand (Elmegaard, Zühlsdorf et al. 2017), and around two thirds of this is used for heating and cooling (Elmegaard, Zühlsdorf et al. 2017). Several ...

    • Investigation of a hybrid compression absorption heat pump system for high temperatures 

      Wersland, Maria Byrkjedal (Master thesis, 2017)
      The industrial sector is a large consumer of high temperature heat. Usually this heat is provided by resources that consume primary energy. At the same time there is a vast amount of low-grade surplus heat available that ...

    • State-of-the-Art for the use of Phase-Change Materials in Tanks Coupled with Heat Pumps 

      Pardiñas, Ángel Á.; Alonso, Maria Justo; Diz, Rubén; Kvalsvik, Karoline Husevåg; Fernandez-Seara, Jose (Journal article; Peer reviewed, 2017)
      With the goal of increasing heat storage in the same accumulation volumes, phase-change materials are considered. There are different substances with different phase-change temperatures that can be used for storing heating ...

    • 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 (Chapter, 2018)
      Commercial refrigeration systems using CO2 as refrigerant are becoming common in the South of Europe, due to technological solutions such as the use of ejectors or parallel compression that allow their efficiency to be ...

    • Superchilling of organic food 

      Claussen, Ingrid Camilla; Gullsvåg, Per Egil; Bantle, Michael; Tolstorebrov, Ignat; Kvalsvik, Karoline Husevåg (Research report, 2017)

    • Superchilling of organic food Part 2: Storage test with superchilled organic salmon and pork chops 

      Claussen, Ingrid Camilla; Gullsvåg, Per Egil; Bantle, Michael; Tolstorebrov, Ignat; Kvalsvik, Karoline Husevåg (SINTEF Energi. Rapport;, Research report, 2017)
      Superchilling of organic salmon fillets and pork chop was investigated and the potential of the concept was documented for the organic sector, especially SMEs. Relative shelf life extensions of 14 days were documented for ...