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Study on improving heat extraction capacity of borehole heat exchanger by forced convection of groundwater

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  • Jia, Yuzhe
  • Zhao, Guanghui
  • Liu, Tao
  • Li, Peng
  • He, Zhifeng
  • Liang, Zheng

Abstract

Borehole Heat Exchangers (BHEs) has the advantage of "extracting heat without extracting groundwater". Its main drawback is low heat extraction power. Aiming at developing medium-deep hydrothermal geothermal resources, a Branch Well Reinforced Coaxial Borehole Heat Exchanger (BWR-CBHE) is proposed firstly. An assisted circulation loop formed by the wellbore and geothermal reservoir is created through drilling branch well and installing electric submersible pump (ESP). By driving the forced convection of groundwater within the assisted circulation loop, heat extraction capacity of the CBHE is enhanced. Then, a numerical model of the BWR-CBHE is established. The main circulation of the working fluid within the CBHE is coupled with the assisted circulation of groundwater, and the heat extraction performance of the BWR-CBHE is calculated. Under the conditions studied in this paper, the net heat extraction power (after deducting the energy consumption of the ESP) of the BWR-CBHE is 6.09 times higher than that of conventional CBHEs. Finally, impacts of parameters, including working fluid, branch well, ESP and formation, on the heat extraction capacity of the BWR-CBHE are discussed. The heat extraction power of the BWR-CBHE is increased significantly without extracting groundwater, which provides a new approach for the development of BHEs.

Suggested Citation

  • Jia, Yuzhe & Zhao, Guanghui & Liu, Tao & Li, Peng & He, Zhifeng & Liang, Zheng, 2024. "Study on improving heat extraction capacity of borehole heat exchanger by forced convection of groundwater," Renewable Energy, Elsevier, vol. 237(PC).
    • Handle: RePEc:eee:renene:v:237:y:2024:i:pc:s0960148124018779
    DOI: 10.1016/j.renene.2024.121809
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    References listed on IDEAS

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