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Thermal Performance Analysis on the Seasonal Heat Storage by Deep Borehole Heat Exchanger with the Extended Finite Line Source Model

Author

Listed:
  • Xiangxi Qin

    (College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
    Lily Group Co., Ltd., Hangzhou 311228, China)

  • Yazhou Zhao

    (Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China
    Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Hangzhou 310027, China
    Zhejiang Key Laboratory of Clean Energy and Carbon Neutrality, Hangzhou 310027, China)

  • Chengjun Dai

    (CNNP Kunhua Energy Development Co., Ltd., Hangzhou 311113, China)

  • Jian Wei

    (Shanghai Zhongsheng Carbon Technology Co., Ltd., Shanghai 200331, China)

  • Dahai Xue

    (CNNP Kunhua Energy Development Co., Ltd., Hangzhou 311113, China)

Abstract

Deep borehole heat exchanger is promising and competitive for seasonal heat storage in the limited space underground with great efficiency. However, seasonal heat storage performance of the essentially deep borehole heat exchanger reaching kilometers underground was seldom studied. In addition, previous research rarely achieved comprehensive assessment for its thermal performance due to seasonal heat storage. Insight into the complicated heat transfer characteristics during the whole process of prior charging and subsequent discharging of deep borehole heat exchanger is in urgent need to be clarified. To this end, an extended finite line source model is proposed to investigate thermal performance of the deep borehole heat exchanger during charging and discharging stages. It is developed with modifications of classical finite line source model to consider the spatio-temporally non-uniform distribution of heat flux density and anisotropic thermal conductivity of deep rock. In general, simulation results demonstrate that thermal performance of the deep borehole heat exchanger deteriorates rapidly both during charging and discharging stages, making it impossible to sustain long-term efficient operation. Specifically, it was discovered that low temperature heat storage utilized only upper section of the borehole as effective heat storage section, and enhancement for heat extraction potential during the heating season was not significant. While high temperature heat storage by deep borehole heat exchanger could only enhance the heat extraction potential for 30 to 40 days in the initial stage of heating. Throughout the discharging, maximum thermal performance enhancement up to 11.27 times was achieved and the heat storage efficiency was evaluated at 2.86 based on average heat exchange rate. The findings of this study are intended to provide a guidance for decisionmakers to determine the most suitable seasonal heat storage strategy for the deep borehole heat exchanger and facilitate the application in engineering practice.

Suggested Citation

  • Xiangxi Qin & Yazhou Zhao & Chengjun Dai & Jian Wei & Dahai Xue, 2022. "Thermal Performance Analysis on the Seasonal Heat Storage by Deep Borehole Heat Exchanger with the Extended Finite Line Source Model," Energies, MDPI, vol. 15(22), pages 1-38, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:22:p:8366-:d:967810
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    References listed on IDEAS

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