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  1. 1. Performance comparison between reciprocating and scroll compressor heat pumps with R600a refrigerant

    Master-uppsats, KTH/Skolan för industriell teknik och management (ITM)

    Författare :CHRISTOFER KRONSTRÖM; [2021]
    Nyckelord :Heat pump; R600a; isobutane; scroll compressor; reciprocating compressor; piston compressor; Värmepump; R600a; isobutan; scrollkompressor; kolvkompressor;

    Sammanfattning : A performance comparison of heat pumps using a scroll (Sanden) and a reciprocating (Bitzer) compressor was conducted experimentally. The refrigerant used was R600a (isobutane). LÄS MER

  3. 2. Evaluation of an economizersolution for a heat pump

    Master-uppsats, KTH/Skolan för industriell teknik och management (ITM)

    Författare :Elsa Forsgren; [2020]
    Nyckelord :;

    Sammanfattning : This thesis evaluates the performance of a heat pump intended to be used as an economizer. The idea is to use the heat from still hot refrigerant after the condenser in a larger heat pump, running on propane, as the heat source for the economizer pump. LÄS MER

  4. 3. Study of high flash point ethyl alcohol-based secondary fluids applied in Ground Source Heat Pumps systems

    Master-uppsats, KTH/Skolan för industriell teknik och management (ITM)

    Författare :Luis Enrique Carrion Domenech; [2019]
    Nyckelord :indirect refrigeration system; secondary fluid; flammability; alcohols; geothermal heat pump systems; properties.;

    Sammanfattning : Ethyl alcohol (ethanol) as secondary fluids is very popular as heat transfer fluid for indirect refrigeration system with ground source heat pump systems (GSHP) in several countries such as Sweden, Norway, Switzerland, Finland and other European countries. There have been several researches about the future ofthe refrigeration sector, refrigerants and refrigeration systems. LÄS MER

  5. 4. Evaluation of CO2 Ice rink heat recovery system performance

    Master-uppsats, KTH/Energiteknik

    Författare :Sotirios Thanasoulas; [2018]
    Nyckelord :Ice rinks; CO2 as refrigerant; Heat recovery; Efficient systems; Operation control; Warm climate; Isrinkar; Koldioxid som kylmedel; Värmeåtervinning; Effektiva system; Driftstyrning; Varmt klimat;

    Sammanfattning : Ice rinks are the largest energy consumers in terms of public buildings due to their simultaneous need of cooling, heating, ventilation, and lighting for different parts of the building which means that these facilities also have a lot of potential for energy saving. Due to the size of the cooling unit in an ice rink the refrigerant charge can become quite high, which potentially has a big impact on the environment. LÄS MER

  7. 5. Transient modeling of a high temperature borehole thermal energy storage coupled with a combined heat and power plant

    Master-uppsats, KTH/Tillämpad termodynamik och kylteknik

    Författare :Malin Malmberg; [2017]
    Nyckelord :;

    Sammanfattning : Coupling High-Temperature Borehole Thermal Energy Storages (HT-BTES) with existing Combined Heat and Power (CHP) systems is a promising approach to increase energy efficiency of district energy systems through recovery of otherwise wasted heat. This solution is currently being discussed in Sweden by the company Tekniska Verken in Linköping AB, for storing waste heat from their CHP operation in summer in a HT-BTES and to utilize it during peaks in winter. LÄS MER