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Field test and numerical investigation on deep coaxial borehole heat exchanger based on distributed optical fiber temperature sensor

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  • Huang, Yibin
  • Zhang, Yanjun
  • Xie, Yangyang
  • Zhang, Yu
  • Gao, Xuefeng
  • Ma, Jingchen

Abstract

The thermal performance of DCBHE is superior to conventional borehole heat exchanger (BHE) systems. In the current study, the field test using a DCBHE (2044 m) is conducted, based on a distributed optical fiber temperature sensor (DOFTS). The temperature of the circulating fluid in terms of depth and operation time is monitored in real-time. The thermal extraction performance of the DCBHE is evaluated over an operation period of 60 d. Moreover, the temperature distribution characteristics, thermal process and impact scope of the formation are analyzed. The results demonstrate that the temperature of the bottom borehole is measured as 107.3 °C via DOFTS, and the average geothermal gradient is determined as 0.0507 °C/m. The thermal power and the coefficient of system performance are able to reach 238.0 W/m and 7.40 following 60 d of operation, respectively. The inner pipe made of polyethylene has exhibits a high level of thermal insulation for the outlet fluid. The thermal process between the soil and fluid is enhanced close to the borehole. And the soil temperature profiles exhibit fluctuations around the borehole within 1 m due to power failure. Furthermore, the formation impact scope is mainly within radius 5 m for operation 60 d.

Suggested Citation

  • Huang, Yibin & Zhang, Yanjun & Xie, Yangyang & Zhang, Yu & Gao, Xuefeng & Ma, Jingchen, 2020. "Field test and numerical investigation on deep coaxial borehole heat exchanger based on distributed optical fiber temperature sensor," Energy, Elsevier, vol. 210(C).
    • Handle: RePEc:eee:energy:v:210:y:2020:i:c:s0360544220317515
    DOI: 10.1016/j.energy.2020.118643
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    Cited by:

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    4. Luo, Yongqiang & Xu, Guozhi & Zhang, Shicong & Cheng, Nan & Tian, Zhiyong & Yu, Jinghua, 2022. "Heat extraction and recover of deep borehole heat exchanger: Negotiating with intermittent operation mode under complex geological conditions," Energy, Elsevier, vol. 241(C).
    5. Violante, Anna Carmela & Proposito, Marco & Donato, Filippo & Guidi, Giambattista & Falconi, Luca Maria, 2021. "Preliminary study of a closed loop vertical ground source heat pump system for an experimental pilot plant (Rome, Italy)," Renewable Energy, Elsevier, vol. 176(C), pages 415-422.
    6. Li, Zhibin & Huang, Wenbo & Chen, Juanwen & Cen, Jiwen & Cao, Wenjiong & Li, Feng & Jiang, Fangming, 2023. "An enhanced super-long gravity heat pipe geothermal system: Conceptual design and numerical study," Energy, Elsevier, vol. 267(C).
    7. Huang, Shuai & Zhu, Ke & Dong, Jiankai & Li, Ji & Kong, Weizheng & Jiang, Yiqiang & Fang, Zhaohong, 2022. "Heat transfer performance of deep borehole heat exchanger with different operation modes," Renewable Energy, Elsevier, vol. 193(C), pages 645-656.
    8. 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).
    9. Cai, Wanlong & Wang, Fenghao & Chen, Chaofan & Chen, Shuang & Liu, Jun & Ren, Zhanli & Shao, Haibing, 2022. "Long-term performance evaluation for deep borehole heat exchanger array under different soil thermal properties and system layouts," Energy, Elsevier, vol. 241(C).
    10. Yongjie Ma & Yanjun Zhang & Yuxiang Cheng & Yu Zhang & Xuefeng Gao & Kun Shan, 2022. "A Case Study of Field Thermal Response Test and Laboratory Test Based on Distributed Optical Fiber Temperature Sensor," Energies, MDPI, vol. 15(21), pages 1-20, October.
    11. 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).
    12. 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.
    13. 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.
    14. Yu, Ziwang & Ye, Xiaoqi & Zhang, Yanjun & Gao, Ping & Huang, Yibin, 2023. "Experimental research on the thermal conductivity of unsaturated rocks in geothermal engineering," Energy, Elsevier, vol. 282(C).
    15. Yazhou Zhao & Xiangxi Qin & Xiangyu Shi, 2022. "Heat Transfer Modeling on High-Temperature Charging and Discharging of Deep Borehole Heat Exchanger with Transient Strong Heat Flux," Sustainability, MDPI, vol. 14(15), pages 1-34, August.

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