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Simplified method and numerical simulation analysis of pipe-group long-term heat transfer in deep-ground heat exchangers

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  • Li, Chao
  • Jiang, Chao
  • Guan, Yanling
  • Chen, Kai
  • Wu, Jiale
  • Xu, Jiamin
  • Wang, Jiachen

Abstract

Deep-buried pipe-group heat transfer is a primary form of utilizing geothermal energy in the middle and deep ground layers. This study introduces a methodology to simplify the heat transfer process of a pipe-group into a single borehole within a finite computational domain. The proposed methodology allows for rapid and accurate assessment of the heat transfer performance of the pipe-group with coaxial deep-ground heat exchangers (C-DGHEs). The feasibility of this simplified method is supported by numerical validation. Consequently, a 20-year numerical computation is performed for pipe-group models with spacings of 15, 20, 30, and 40 m, alongside a comparative study on the heat transfer of a single borehole C-DGHE with a computational domain radius of 200 m. For a pipe-group spacing of 15 m, the results demonstrated that the heat transfer boundary is exceeded in the first year of heat extraction but stabilized into a steady decline. For a spacing of 40 m, the decrease in heat transfer over 20 years was less than 15 % compared to the single C-DGHE. This research effectively evaluates the heat transfer performance of pipe groups, providing theoretical support and technical guidance to develop and promote the applications of deep geothermal energy.

Suggested Citation

  • Li, Chao & Jiang, Chao & Guan, Yanling & Chen, Kai & Wu, Jiale & Xu, Jiamin & Wang, Jiachen, 2024. "Simplified method and numerical simulation analysis of pipe-group long-term heat transfer in deep-ground heat exchangers," Energy, Elsevier, vol. 299(C).
    • Handle: RePEc:eee:energy:v:299:y:2024:i:c:s0360544224013069
    DOI: 10.1016/j.energy.2024.131533
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    References listed on IDEAS

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    1. Li, Chao & Jiang, Chao & Guan, Yanling, 2022. "An analytical model for heat transfer characteristics of a deep-buried U-bend pipe and its heat transfer performance under different deflecting angles," Energy, Elsevier, vol. 244(PA).
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