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A coupled heat transfer model of medium-depth downhole coaxial heat exchanger based on the piecewise analytical solution
Ma, Ling1; Zhao, Yazhou2,3,4; Yin, Hongmei1; Zhao, Jun1; Li, Wenjia1; Wang, Heyang1
2020-01-15
Source PublicationENERGY CONVERSION AND MANAGEMENT
ISSN0196-8904
Volume204Pages:17
AbstractTo 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.
KeywordDownhole coaxial heat exchanger Piecewise calculation Coupling interface Heat extraction efficiency Sensitivity analysis
DOI10.1016/j.enconman.2019.112308
Funding OrganizationTianjin 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
WOS KeywordGEOTHERMAL POWER-GENERATION ; ABANDONED OIL ; THERMAL PERFORMANCE ; FIELD-TEST ; GAS-WELLS ; BOREHOLE ; ENERGY ; PUMP ; SIMULATION ; SYSTEM
Language英语
Funding ProjectTianjin Science and Technology Project[17YFZCGX00580]
Funding OrganizationTianjin 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
WOS Research AreaThermodynamics ; Energy & Fuels ; Mechanics
WOS SubjectThermodynamics ; Energy & Fuels ; Mechanics
WOS IDWOS:000510954300012
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95677
Collection页岩气与地质工程院重点实验室
Corresponding AuthorZhao, Jun
Affiliation1.Tianjin Univ, Key Lab Efficient Utilizat Low & Medium Grade Ene, Minist Educ China, Tianjin 300350, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Inst Earch Sci, Beijing 100029, Peoples R China
4.Univ Chinesce Acad Sci, Coll Earch Sci, Beijing 100049, Peoples R China
Recommended Citation
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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