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The potential of intermediate-to-deep geothermal boreholes for seasonal storage of district heat

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  • Hirvijoki, Eero
  • Hirvonen, Janne

Abstract

This paper explores intermediate-to-deep coaxial geothermal boreholes for seasonal storage of district heat. Extracting heat from within the bedrock creates a “temperature pothole” which can be filled and utilized for thermal storage. Unlike in shallow boreholes, the pothole effect minimizes losses and offers a novel heat-storage concept. Exploiting this idea, two scenarios are studied: one to maximize the capacity factor of the district heating network and another to utilize intermittent wind power as a heat source on annual basis. With the borehole serving as a load-shifting storage facility in both cases, simulating the minimum annual delivery temperature as a function of the borehole depth and the system’s average power rating enables determining the necessary sizing for the borehole to function as a storage for space heating on annual basis. The first-principle simulation results show that, in co-operation with the borehole, intermittent wind power as well as a district heat network operating at full capacity throughout the year both could cover the hourly heat demand with effectively 100% storage efficiency, provided that the borehole depth and system power rating are chosen in proportion.

Suggested Citation

  • Hirvijoki, Eero & Hirvonen, Janne, 2022. "The potential of intermediate-to-deep geothermal boreholes for seasonal storage of district heat," Renewable Energy, Elsevier, vol. 198(C), pages 825-832.
    • Handle: RePEc:eee:renene:v:198:y:2022:i:c:p:825-832
    DOI: 10.1016/j.renene.2022.08.070
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    References listed on IDEAS

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