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Comparison of the experimental and numerical results of coaxial-type and U-type deep-buried pipes’ heat transfer performances

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  • Li, Chao
  • Jiang, Chao
  • Guan, Yanling
  • Chen, Hao
  • Yang, Ruitao
  • Wan, Rong
  • Shen, Lu

Abstract

The ground heat exchanger (GHE) is one of the main forms of geothermal energy utilization in middle-deep strata and typically includes coaxial-type deep-buried GHE (C-DGHE) and U-type deep-buried GHE (U-DGHE). This study compares the heat transfer characteristics of C-DGHE and U-DGHE. A field experiment was carried out on C-DGHE and U-DGHE at 2539 and 2781 m depths, respectively, in a housing estate in Xi'an. Simultaneously, the full-scale numerical models of both C-DGHE and U-DGHE at 2781 m were established based on the field logging data. A short-term experiment (72 h) and a long-term heat transfer simulation (five heating periods) serve to comprehensively compare the heat transfer performances of the two deep-buried pipe types. Results demonstrate that the heat transfer amount per unit meter of C-DGHE and U-DGHE were 132.18–145.91 W/m and 111.15–140.76 W/m respectively in this study, which means C-DGHE is superior to U-DGHE under similar boundary conditions when only heat transfer in buried pipes is considered. However, when heat transfer in buried pipes and water pump power consumption are considered simultaneously, a critical G (GC was ∼8.63 kg/s in this study) makes the comprehensive heat transfer performance of U-DGHE better than that of C-DGHE.

Suggested Citation

  • Li, Chao & Jiang, Chao & Guan, Yanling & Chen, Hao & Yang, Ruitao & Wan, Rong & Shen, Lu, 2023. "Comparison of the experimental and numerical results of coaxial-type and U-type deep-buried pipes’ heat transfer performances," Renewable Energy, Elsevier, vol. 210(C), pages 95-106.
    • Handle: RePEc:eee:renene:v:210:y:2023:i:c:p:95-106
    DOI: 10.1016/j.renene.2023.04.046
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    1. Huang, Shuai & Li, Jiqin & Zhu, Ke & Dong, Jiankai & Jiang, Yiqiang, 2024. "Numerical investigation on the long-term heating performance and sustainability analysis of medium-deep U-type borehole heat exchanger system," Energy, Elsevier, vol. 289(C).
    2. 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).

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