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Experimental investigation of seepage and heat transfer in rough fractures for enhanced geothermal systems

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  • Huang, Yibin
  • Zhang, Yanjun
  • Yu, Ziwang
  • Ma, Yueqiang
  • Zhang, Chi

Abstract

Enhancing the heat transfer efficiency between working fluids and hot dry rocks (HDRs) in fracture reservoirs is important. In this paper, we present the seepage and convective heat transfer experiment to investigate the behavior of distilled water in the artificial rock samples. The reproducibility of the experimental studies can be achieved based on Barton's JRC profiles and advanced 3D printing technology. The roughness of two rock samples is 10–12 &18–20 and 18–20 &10–12 respectively. The effects of roughness and confining pressure on seepage characteristics were analyzed. The variation of rock temperature with time under initial temperature and flow rate was obtained. And the effects of roughness on heat transfer performance for two specimens were evaluated. The results indicated that large roughness in the direction perpendicular to flow would decrease seepage capacity and the confining pressure had great influence on seepage. And higher flow rate would extract more heat in fractured reservoir. Furthermore, the outlet temperature was almost linear with the original rock temperatures. Finally, the large roughness in the direction perpendicular to flow would strengthen heat transfer and large roughness in the direction parallel to flow would reduce effective heat transfer area.

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  • Huang, Yibin & Zhang, Yanjun & Yu, Ziwang & Ma, Yueqiang & Zhang, Chi, 2019. "Experimental investigation of seepage and heat transfer in rough fractures for enhanced geothermal systems," Renewable Energy, Elsevier, vol. 135(C), pages 846-855.
    • Handle: RePEc:eee:renene:v:135:y:2019:i:c:p:846-855
    DOI: 10.1016/j.renene.2018.12.063
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    1. Yang, Fujian & Wang, Guiling & Hu, Dawei & Liu, Yanguang & Zhou, Hui & Tan, Xianfeng, 2021. "Calibrations of thermo-hydro-mechanical coupling parameters for heating and water-cooling treated granite," Renewable Energy, Elsevier, vol. 168(C), pages 544-558.
    2. Ma, Yueqiang & Zhang, Yanjun & Hu, Zhongjun & Yu, Ziwang & Zhou, Ling & Huang, Yibin, 2020. "Numerical investigation of heat transfer performance of water flowing through a reservoir with two intersecting fractures," Renewable Energy, Elsevier, vol. 153(C), pages 93-107.
    3. Wang, Yijiang & Jiang, Jinyi & Darkwa, Jo & Xu, Zeyuan & Zheng, Xiaofeng & Zhou, Guoqing, 2020. "Experimental study of thermal fracturing of Hot Dry Rock irradiated by moving laser beam: Temperature, efficiency and porosity," Renewable Energy, Elsevier, vol. 160(C), pages 803-816.
    4. 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).
    5. He, Renhui & Rong, Guan & Tan, Jie & Phoon, Kok-Kwang & Quan, Junsong, 2022. "Numerical evaluation of heat extraction performance in enhanced geothermal system considering rough-walled fractures," Renewable Energy, Elsevier, vol. 188(C), pages 524-544.
    6. Heinze, Thomas, 2021. "Constraining the heat transfer coefficient of rock fractures," Renewable Energy, Elsevier, vol. 177(C), pages 433-447.
    7. 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).
    8. Gao, Xuefeng & Zhang, Yanjun & Cheng, Yuxiang & Yu, Ziwang & Hu, Zhongjun & Huang, Yibin, 2023. "Heat extraction performance of fractured geothermal reservoirs considering aperture variability," Energy, Elsevier, vol. 269(C).
    9. Feng Xiong & Chu Zhu & Qinghui Jiang, 2021. "A Novel Procedure for Coupled Simulation of Thermal and Fluid Flow Models for Rough-Walled Rock Fractures," Energies, MDPI, vol. 14(4), pages 1-17, February.

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