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A coupled heat transfer model of medium-depth downhole coaxial heat exchanger based on the piecewise analytical solution

文献类型：期刊论文

作者Ma, Ling2; Zhao, Yazhou1,3,4; Yin, Hongmei2; Zhao, Jun2; Li, Wenjia2; Wang, Heyang2
刊名ENERGY CONVERSION AND MANAGEMENT
出版日期2020-01-15
卷号204页码:17
关键词Downhole coaxial heat exchanger Piecewise calculation Coupling interface Heat extraction efficiency Sensitivity analysis
ISSN号0196-8904
DOI10.1016/j.enconman.2019.112308
英文摘要To describe the heat transfer processes of medium-depth downhole coaxial heat exchangers (MDCHEs) effectively, an analytical solution that couples the transient heat conduction in surrounding soil (or rock) with the quasi-steady heat transfer process in borehole was developed in this study. The piecewise calculation method was adopted both on the time scale and in the depth dimension in this model. With MATLAB as the programming platform, the proposed model was validated with reported experiments and numerical simulations, and the heat extraction efficiency was defined for comprehensive evaluation of heat transfer performance of MDCHEs. Afterwards, the impacts of Reynolds number, geothermal temperature gradient and inlet fluid temperature on the heat transfer performance of MDCHEs were analyzed. It is found that the analytical model with the time-piecewise function of the heat flux through the borehole wall instead of the temperature at the borehole wall as the coupling interface yielded more accurate heat transfer rates and fluid temperatures. Besides, the concave curves of fluid temperature were in better accordance with the practicalities. It was also found that the heat transfer of MDCHEs can be improved by increasing Reynolds number, but its increments gradually decreased. The recommended value of Reynolds number ranges from 1 x 10(4) to 4 x 10(4) and the heat extraction efficiency is recommended to be greater than 70% in engineering applications. The decrease of inlet fluid temperature and the increase of geothermal temperature gradient enhance the heat transfer rate at a steady pace. The analytical solution facilitates convenient design and optimal operation of MDCHEs.
WOS关键词GEOTHERMAL POWER-GENERATION ; ABANDONED OIL ; THERMAL PERFORMANCE ; FIELD-TEST ; GAS-WELLS ; BOREHOLE ; ENERGY ; PUMP ; SIMULATION ; SYSTEM
资助项目Tianjin Science and Technology Project[17YFZCGX00580]
WOS研究方向Thermodynamics ; Energy & Fuels ; Mechanics
语种英语
WOS记录号WOS:000510954300012
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构Tianjin Science and Technology Project ; Tianjin Science and Technology Project ; Tianjin Science and Technology Project ; Tianjin Science and Technology Project ; Tianjin Science and Technology Project ; Tianjin Science and Technology Project ; Tianjin Science and Technology Project ; Tianjin Science and Technology Project
源URL[http://ir.iggcas.ac.cn/handle/132A11/95677]  
专题地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者Zhao, Jun
作者单位1.Chinese Acad Sci, Inst Earch Sci, Beijing 100029, Peoples R China
2.Tianjin Univ, Key Lab Efficient Utilizat Low & Medium Grade Ene, Minist Educ China, Tianjin 300350, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
4.Univ Chinesce Acad Sci, Coll Earch Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Ma, Ling,Zhao, Yazhou,Yin, Hongmei,et al. A coupled heat transfer model of medium-depth downhole coaxial heat exchanger based on the piecewise analytical solution[J]. ENERGY CONVERSION AND MANAGEMENT,2020,204:17.
APA Ma, Ling,Zhao, Yazhou,Yin, Hongmei,Zhao, Jun,Li, Wenjia,&Wang, Heyang.(2020).A coupled heat transfer model of medium-depth downhole coaxial heat exchanger based on the piecewise analytical solution.ENERGY CONVERSION AND MANAGEMENT,204,17.
MLA Ma, Ling,et al."A coupled heat transfer model of medium-depth downhole coaxial heat exchanger based on the piecewise analytical solution".ENERGY CONVERSION AND MANAGEMENT 204(2020):17.

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来源：地质与地球物理研究所

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