Volume 49 Issue 5
Oct.  2021
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YU Chao, ZHANG Yiqun, SONG Xianzhi, WANG Gaosheng, HUANG Haochen. Comprehensive Evaluation and Optimization of Circulating Working Fluids inthe Coaxial Borehole Heat Exchanger Closed-Loop Geothermal System[J]. Petroleum Drilling Techniques, 2021, 49(5): 101-107. DOI: 10.11911/syztjs.2021066
Citation: YU Chao, ZHANG Yiqun, SONG Xianzhi, WANG Gaosheng, HUANG Haochen. Comprehensive Evaluation and Optimization of Circulating Working Fluids inthe Coaxial Borehole Heat Exchanger Closed-Loop Geothermal System[J]. Petroleum Drilling Techniques, 2021, 49(5): 101-107. DOI: 10.11911/syztjs.2021066
shu

Comprehensive Evaluation and Optimization of Circulating Working Fluids inthe Coaxial Borehole Heat Exchanger Closed-Loop Geothermal System

  • State Key Laboratory of Petroleum Resources and Prospecting (China University of Petroleum (Beijing)), Beijing, 102249, China

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  • Received Date: February 11, 2021
  • Revised Date: July 20, 2021
  • Available Online: April 26, 2021
    Graphical Abstract
    • Abstract
  • In the CBHE(coaxial borehole heat exchangers) closed-loop geothermal system, the influences of different circulating working fluids on the heat exchange performance of the system are still unclear, and it is not possible to comprehensively evaluate the heat exchange performance with only a single factor. Regarding this problem, a three-dimensional numerical model of fluid flow and heat transfer for the CBHE closed-loop geothermal system was built with COMSOL and verified with field data. Then, four parameters, i.e., outlet temperature, heat exchange power, circulating pressure loss, and COP (coefficient of performance) were selected, and their weight coefficients were determined by the analytic hierarchy process. Finally, a model based on the fuzzy comprehensive evaluation method was built to comprehensively assess the heat exchange performance of nine working fluids. According to the results, the working fluids were classified into three grades, with CO2 scoring the highest, indicating that CO2 had the best overall heat exchange performance and was the optimal circulating working fluid. This model can be used to comprehensively evaluate the heat exchange performance of circulating working fluids, and with CO2 as the circulating working fluid, the heat exchange efficiency of the CBHE closed-loop geothermal system can be significantly improved.
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    • References (23)
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