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Effect of inner pipe type on the heat transfer performance of deep-buried coaxial double-pipe heat exchangers

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  • Li, Chao
  • Guan, Yanling
  • Yang, Ruitao
  • Lu, Xiong
  • Xiong, Wenxue
  • Long, Anjie

Abstract

In the present study, based on the currently used deep-buried coaxial double-pipe heat exchange systems for closed loop heat extraction, the influence of several inner pipe types on the heat transfer performance of buried pipe systems is analyzed. The deep-buried coaxial double-pipe with a smooth inner pipe used in current practice was taken as an example, and a full-scale three-dimensional (3D) numerical model coupling the heat transfer processes inside and outside the pipe was established by using a depth of 50 m and taking into account the modeling workload. Based on this model, full-scale 3D numerical models of coaxial double-pipes with spiral and corrugated pipes as the inner pipe types were established, and numerical analysis of heat transfer was performed. The results indicated that the heat transfer capacity of the buried pipe system can be improved by changing the shape of the inner pipe. However, the influence of the inner pipe type on heat transfer was far lower than that of the water flow rate circulating inside the buried pipe system and the initial ground temperature.

Suggested Citation

  • Li, Chao & Guan, Yanling & Yang, Ruitao & Lu, Xiong & Xiong, Wenxue & Long, Anjie, 2020. "Effect of inner pipe type on the heat transfer performance of deep-buried coaxial double-pipe heat exchangers," Renewable Energy, Elsevier, vol. 145(C), pages 1049-1060.
    • Handle: RePEc:eee:renene:v:145:y:2020:i:c:p:1049-1060
    DOI: 10.1016/j.renene.2019.06.101
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    Cited by:

    1. Gao, Xuefeng & Zhang, Yanjun & Cheng, Yuxiang & Huang, Yibin & Deng, Hao & Ma, Yongjie, 2022. "A novel strategy utilizing local fracture networks to enhance CBHE heat extraction performance: A case study of the Songyuan geothermal field in China," Energy, Elsevier, vol. 255(C).
    2. Chen, Hongfei & Liu, Hongtao & Yang, Fuxin & Tan, Houzhang & Wang, Bangju, 2023. "Field measurements and numerical investigation on heat transfer characteristics and long-term performance of deep borehole heat exchangers," Renewable Energy, Elsevier, vol. 205(C), pages 1125-1136.
    3. Pokhrel, Sajjan & Sasmito, Agus P. & Sainoki, Atsushi & Tosha, Toshiyuki & Tanaka, Tatsuya & Nagai, Chiaki & Ghoreishi-Madiseh, Seyed Ali, 2022. "Field-scale experimental and numerical analysis of a downhole coaxial heat exchanger for geothermal energy production," Renewable Energy, Elsevier, vol. 182(C), pages 521-535.
    4. Lee, Seokjae & Park, Sangwoo & Kang, Minkyu & Oh, Kwanggeun & Choi, Hangseok, 2022. "Effect of tube-in-tube configuration on thermal performance of coaxial-type ground heat exchanger," Renewable Energy, Elsevier, vol. 197(C), pages 518-527.

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