Heat extraction performance of multi-level, multi-branch, closed loop coaxial horizontal borehole heat exchanger geothermal system
Applied Thermal Engineering, vol. 269, pp. 126045
Abstract
To overcome the problem of limited heat exchange area and highly drilling costs, this study proposes a multi-level and multi-branch coaxial horizontal borehole heat exchanger geothermal system. Compared with multi-branch U shape heat exchanger system, the new system only requires drilling one vertical well, which can save drilling costs. Compared with single coaxial horizontal borehole system,the new system has multiple horizontal wells that can increase the heat transfer area. A 3D heat transfer model in hot dry rock (HDR) and a 1D convective heat transfer model in the wellbore were established. To studied the heat extraction performance and the key parameters affecting the heat extraction efficiency of the geothermal system. The results indicate that the maximum heat production power can only be achieved by controlling the injection rate to a certain extent. The heat production power increases linearly with the horizontal well length and branches. The heat production power increases linearly with horizontal well level 1–4, and then the growth rate decreases at 5 level. When the horizontal well levels are 4, branches are 4, and length is 3000, the unit electricity cost is the lowest. Through parameter optimization, we have found the optimal parameters for improving the heating power efficiency of the system, which can provide reference for the design of deep geothermal development processes.
Authors 9
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Guoying Wang corresponding
Affiliation as printed
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454002, China
State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo, 454002, China
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Housheng Jia corresponding
Affiliation as printed
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454002, China
State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo, 454002, China
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Taiyuan University of Technology
Affiliation as printed
Key Laboratory of In-situ Property-improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan, 030024, China
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Affiliation as printed
Institute for Applied:Geophysics’ and Geothemal Energy, RWTH Aachen University, 52074 Aachen, Germany
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Sichuan University · State Key Laboratory of Hydraulics and Mountain River Engineering
Affiliation as printed
State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource &Hydropower, Sichuan University, Chengdu 610065, China
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China University of Petroleum, East China
Affiliation as printed
Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, China
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Affiliation as printed
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454002, China
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Affiliation as printed
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454002, China
State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo, 454002, China
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Affiliation as printed
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454002, China
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