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Domestic Hot Water Production with Ground Source Heat Pump in Apartment Buildings

Author

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  • Jukka Yrjölä

    (Helsinki Metropolia University of Applied Sciences, Degree Programme of Building Services Engineering, Vanha maantie 6, Espoo FI-02650, Finland)

  • Eetu Laaksonen

    (Helsinki Metropolia University of Applied Sciences, Degree Programme of Building Services Engineering, Vanha maantie 6, Espoo FI-02650, Finland)

Abstract

Producing domestic hot water (DHW) with a ground source heat pump (GSHP) is challenging due to the high temperature (HT) of DHW. There are many studies proving the better performance of cascade heat pumps compared to single-stage heat pumps when the difference between the condensing and the evaporation temperature is large. In this system approach study, different GSHP arrangements are described and computationally compared. A two-stage heat pump arrangement is introduced in which water tanks of the heating system are utilized for warming up the DHW in two stages. It is shown that the electricity consumption with this two-stage system is approximately 31% less than with the single-stage heat pump and 12% less than with the cascade system. Further, both low temperature (LT) and HT heat pumps can run alone, which is not common in cascade or other two-stage heat pumps. This is advantageous because the high loads of the space heating and DHW production are not simultaneous. Proper insulation of the DHW and recirculation pipe network is essential, and drying towel rails or other heating coils should be avoided when aiming for a high efficiency. The refrigerants in the calculations are R407C for the LT heat pump and R134a for the HT heat pump. Investment costs are excluded from calculations.

Suggested Citation

  • Jukka Yrjölä & Eetu Laaksonen, 2015. "Domestic Hot Water Production with Ground Source Heat Pump in Apartment Buildings," Energies, MDPI, vol. 8(8), pages 1-20, August.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:8:p:8447-8466:d:54017
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    References listed on IDEAS

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    1. Fabrizio, Enrico & Seguro, Federico & Filippi, Marco, 2014. "Integrated HVAC and DHW production systems for Zero Energy Buildings," Renewable and Sustainable Energy Reviews, Elsevier, vol. 40(C), pages 515-541.
    2. Ozgener, Onder & Hepbasli, Arif, 2007. "A review on the energy and exergy analysis of solar assisted heat pump systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 11(3), pages 482-496, April.
    3. Chua, K.J. & Chou, S.K. & Yang, W.M., 2010. "Advances in heat pump systems: A review," Applied Energy, Elsevier, vol. 87(12), pages 3611-3624, December.
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    Cited by:

    1. Song, Jeonghun & Oh, Si-Doek & Song, Seung Jin, 2019. "Effect of increased building-integrated renewable energy on building energy portfolio and energy flows in an urban district of Korea," Energy, Elsevier, vol. 189(C).
    2. Kaiser Ahmed & Jevgeni Fadejev & Jarek Kurnitski, 2019. "Modeling an Alternate Operational Ground Source Heat Pump for Combined Space Heating and Domestic Hot Water Power Sizing," Energies, MDPI, vol. 12(11), pages 1-26, June.

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