Digitala Vetenskapliga Arkivet

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  • 1.
    Karampour, Mazyar
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Carlos, Mateu-Royo
    Department of Mechanical Engineering and Construction, Universitat Jaume I, Campus de Riu Sec s/n, E12071 Castelló de la Plana, Spain.
    Rogstam, Jörgen
    Energi & Kylanalys AB, Varuvägen 9, 125 30 Älvsjö, Sweden .
    Sawalha, Samer
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Geothermal Storage Integration into a Supermarket’s CO2 Refrigeration System2019In: International journal of refrigeration, ISSN 0140-7007, E-ISSN 1879-2081, Vol. 106, p. 492-505Article in journal (Refereed)
    Abstract [en]

    This paper investigates the integration of geothermal storage into state-of-the-art CO2 trans-critical boostersystems. The objective is to evaluate the impact of this integration on energy efficiency. Three scenarios of integration are studied including stand-alone and integrated supermarket building systems. The results show that for a stand-alone average size supermarket, heat recovery from the CO2 system should be prioritized over a separate ground source heat pump. Extracting heat from the ground by an extra evaporator in the CO2 system has also little impact on this supermarket annual energy use. However, in the case of supermarket integration with a neighbouring building where the supermarket provides heat to the neighbour, geothermal storage integration can reduce the total annual running cost of the two non-integrated buildings by 20-30% with a payback time of less than 3.5 years. The results also show there is no need for a separate ground source heat pump.

    The full text will be freely available from 2021-05-23 00:00
  • 2.
    Karampour, Mazyar
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Carlos, Mateu-Royo
    ISTENER Research Group, Department of Mechanical Engineering and Construction, Universitat Jaume I, Campus de Riu Sec s/n, E12071 Castelló de la Plana, Spain .
    Rogstam, Jörgen
    Energi & Kylanalys AB, Varuvägen 9, Älvsjö 125 30, Sweden .
    Sawalha, Samer
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
    Integration of Supermarket’s CO2 Refrigeration System and Geothermal Storage2019Conference paper (Refereed)
    Abstract [en]

    This paper investigates the energy efficiency of geothermal storage integration into the state-of-the-art CO2 trans-critical booster systems. Three scenarios of integration are studied including stand-alone and integrated supermarket building systems.

    The results show that for a stand-alone supermarket, heat recovery from the CO2 system should be prioritized over extracting heat from the ground, which this heat extraction can be done either by an extra evaporator in the CO2 system or by a separate ground source heat pump. In the case of supermarket integration with a nearby district heating consumer, geothermal storage integration with extra evaporator in the CO2 refrigeration system can reduce the total annual running cost of the two buildings by 19-31% and with a payback time of less than three years.

    This integration is beneficial if the full efficient heat recovery capacity of the CO2 system is not sufficient to provide the entire demands.

    Download full text (pdf)
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