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Analysis of Geo-Temperature Restoration Performance under Intermittent Operation of Borehole Heat Exchanger Fields

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  • Chaofeng Li

    (Institute of Military Environmental Teaching and Research, PLA University of Science and Technology, Nanjing 210007, China)

  • Jinfeng Mao

    (Institute of Military Environmental Teaching and Research, PLA University of Science and Technology, Nanjing 210007, China)

  • Zheli Xing

    (Institute of Military Environmental Teaching and Research, PLA University of Science and Technology, Nanjing 210007, China)

  • Jin Zhou

    (Institute of Military Environmental Teaching and Research, PLA University of Science and Technology, Nanjing 210007, China)

  • Yong Li

    (Institute of Military Environmental Teaching and Research, PLA University of Science and Technology, Nanjing 210007, China)

Abstract

Intermittent operation can improve the coefficient of performance (COP) of a ground source heat pump (GSHP) system. In this paper, an analytical solution to analyze the geo-temperature restoration performance under intermittent operation of borehole heat exchanger (BHE) fields is established. For this purpose, the moving finite line source model is combined with the g-function and the superposition principle. The model takes into account the heat transfer along the borehole, thermal interference between BHEs, and the influence of groundwater flow. The accuracy of the model is validated through comparison with an experiment carried out under intermittent operation. The model makes it possible to analyze the geo-temperature restoration performance and its influencing factors, such as BHE spacing, heat flow rate, operation mode, and groundwater flow. The main conclusions of this work are as follows. The heat transfer along the borehole should be considered when analyzing the geo-temperature restoration performance. When the BHE spacing increases, the soil temperature change decreases and the heat recovery improves. Therefore, adequate borehole separation distance is essential in the case of a multiple BHE system with unbalanced load. The presence of groundwater flow is associated with interference between the BHEs, which should not be ignored. In the case of long-term operation, the groundwater flow is beneficial to the geo-temperature recovery process, even for downstream BHEs. Finally, a greater groundwater flux leads to a better geo-temperature recovery.

Suggested Citation

  • Chaofeng Li & Jinfeng Mao & Zheli Xing & Jin Zhou & Yong Li, 2015. "Analysis of Geo-Temperature Restoration Performance under Intermittent Operation of Borehole Heat Exchanger Fields," Sustainability, MDPI, vol. 8(1), pages 1-14, December.
    • Handle: RePEc:gam:jsusta:v:8:y:2015:i:1:p:35-:d:61532
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    References listed on IDEAS

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    1. Gao, Qing & Li, Ming & Yu, Ming, 2010. "Experiment and simulation of temperature characteristics of intermittently-controlled ground heat exchanges," Renewable Energy, Elsevier, vol. 35(6), pages 1169-1174.
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    Cited by:

    1. Zhu, Li & Chen, Sarula & Yang, Yang & Tian, Wei & Sun, Yong & Lyu, Mian, 2019. "Global sensitivity analysis on borehole thermal energy storage performances under intermittent operation mode in the first charging phase," Renewable Energy, Elsevier, vol. 143(C), pages 183-198.
    2. Guo, Fang & Zhu, Xiaoyue & Zhang, Junyue & Yang, Xudong, 2020. "Large-scale living laboratory of seasonal borehole thermal energy storage system for urban district heating," Applied Energy, Elsevier, vol. 264(C).

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