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Experimental and numerical studies on heat transfer characteristics of vertical deep-buried U-bend pipe to supply heat in buildings with geothermal energy

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  • Li, Chao
  • Guan, Yanling
  • Wang, Xing
  • Li, Gaopeng
  • Zhou, Cong
  • Xun, Yingjiu

Abstract

In this study, in-situ experiments and numerical simulations were used to study the heat transfer characteristics of a heat exchange system, a vertical deep-buried U-bend pipe with a buried depth of >2000 m to supply heat to buildings in Xi'an using geothermal energy. The in-situ experimental conditions include a constant inlet temperature and water flow rate in the deep-buried pipe, and the inlet and outlet water temperatures of the buried pipe were measured to obtain the dynamic heat transfer load of the buried pipe under the experimental conditions. Based on the experimental results, a full-scale numerical calculation model combining the heat transfer processes inside and outside the pipe was established and validated. Based on the model, the effects of water flow rate and running time of the system on the heat transfer capacity of the buried pipe were calculated and analyzed under the practical conditions of nonuniformity from the top to the bottom by considering the ground temperature and structure of rock and soil. The thermal effect radius and linear meter heat transfer of the buried pipe were also analyzed.

Suggested Citation

  • Li, Chao & Guan, Yanling & Wang, Xing & Li, Gaopeng & Zhou, Cong & Xun, Yingjiu, 2018. "Experimental and numerical studies on heat transfer characteristics of vertical deep-buried U-bend pipe to supply heat in buildings with geothermal energy," Energy, Elsevier, vol. 142(C), pages 689-701.
    • Handle: RePEc:eee:energy:v:142:y:2018:i:c:p:689-701
    DOI: 10.1016/j.energy.2017.10.056
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    References listed on IDEAS

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    Cited by:

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    3. Li, Chao & Guan, Yanling & Jiang, Chao & Deng, Shunxi & Lu, Zhenzhen, 2020. "Numerical study on the heat transfer, extraction, and storage in a deep-buried pipe," Renewable Energy, Elsevier, vol. 152(C), pages 1055-1066.
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    5. Wang, Changlong & Sun, Wanyu & Fu, Qiang & Lu, Yuehong & Zhang, Pengyuan, 2024. "Semi-analytical and numerical modeling of U-bend deep borehole heat exchanger," Renewable Energy, Elsevier, vol. 222(C).
    6. Wang, Kang & Xie, Kai & Zhang, Hui & Qiang, Yujie & Du, Yanping & Xiong, Yaxuan & Zou, Zhenwei & Zhang, Mingbao & Zhong, Liqiong & Akkurt, Nevzat & Chen, Ning & Xu, Qian, 2022. "Numerical evaluation of the coupled/uncoupled effectiveness of a fluid-solid-thermal multi-field model for a long-distance energy transmission pipeline," Energy, Elsevier, vol. 251(C).
    7. Li, Chao & Guan, Yanling & Liu, Jianhong & Jiang, Chao & Yang, Ruitao & Hou, Xueming, 2020. "Heat transfer performance of a deep ground heat exchanger for building heating in long-term service," Renewable Energy, Elsevier, vol. 166(C), pages 20-34.
    8. Shen, Junhao & Zhou, Chaohui & Luo, Yongqiang & Tian, Zhiyong & Zhang, Shicong & Fan, Jianhua & Ling, Zhang, 2023. "Comprehensive thermal performance analysis and optimization study on U-type deep borehole ground source heat pump systems based on a new analytical model," Energy, Elsevier, vol. 274(C).
    9. Yu, Han & Xu, Tianfu & Yuan, Yilong & Gherardi, Fabrizio & Feng, Bo & Jiang, Zhenjiao & Hu, Zixu, 2021. "Enhanced heat extraction for deep borehole heat exchanger through the jet grouting method using high thermal conductivity material," Renewable Energy, Elsevier, vol. 177(C), pages 1102-1115.
    10. Chen, Jingping & Feng, Shaohang, 2020. "Evaluating a large geothermal absorber’s energy extraction and storage performance in a common geological condition," Applied Energy, Elsevier, vol. 279(C).
    11. Yu, Han & Xu, Tianfu & Yuan, Yilong & Feng, Bo & ShangGuan, Shuantong, 2023. "Enhanced heat extraction performance from deep buried U-shaped well using the high-pressure jet grouting technology," Renewable Energy, Elsevier, vol. 202(C), pages 1377-1386.
    12. Chen, Chaofan & Cai, Wanlong & Naumov, Dmitri & Tu, Kun & Zhou, Hongwei & Zhang, Yuping & Kolditz, Olaf & Shao, Haibing, 2021. "Numerical investigation on the capacity and efficiency of a deep enhanced U-tube borehole heat exchanger system for building heating," Renewable Energy, Elsevier, vol. 169(C), pages 557-572.
    13. Li, Chao & Jiang, Chao & Guan, Yanling & Tan, Zijing & Zhao, Zhiqiang & Zhou, Yang, 2022. "Development and applicability of heat transfer analytical model for coaxial-type deep-buried pipes," Energy, Elsevier, vol. 255(C).
    14. 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.
    15. 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).
    16. Pei, Wansheng & Zhang, Mingyi & Li, Shuangyang & Lai, Yuanming & Dong, Yuanhong & Jin, Long, 2019. "Laboratory investigation of the efficiency optimization of an inclined two-phase closed thermosyphon in ambient cool energy utilization," Renewable Energy, Elsevier, vol. 133(C), pages 1178-1187.
    17. Shi, Shuang & Li, Pengting & Sheng, Zhilin & Jiang, Dachuan & Tan, Yi & Wang, Dengke & Wen, Shutao & Asghar, H.M. Noor ul Huda Khan, 2019. "Energy efficiency improvement in electron beam purification of silicon by using graphite lining," Energy, Elsevier, vol. 185(C), pages 102-110.
    18. Liu, Jun & Wang, Fenghao & Cai, Wanlong & Wang, Zhihua & Li, Chun, 2020. "Numerical investigation on the effects of geological parameters and layered subsurface on the thermal performance of medium-deep borehole heat exchanger," Renewable Energy, Elsevier, vol. 149(C), pages 384-399.

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