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An efficient hybrid model for thermal analysis of deep borehole heat exchangers

文献类型：期刊论文

作者Zhao, Yazhou1,2,3; Pang, Zhonghe1,2,3; Huang, Yonghui1,2,3; Ma, Zhibo4
刊名GEOTHERMAL ENERGY
出版日期2020-06-15
卷号8期号:1页码:31
关键词Deep borehole heat exchanger Efficient modeling Analytical formulation Heat propagation front Accuracy and calculation acceleration
ISSN号2195-9706
DOI10.1186/s40517-020-00170-z
英文摘要The deep borehole heat exchanger (DBHE) shows great potential in seasonal thermal energy storage and its high performance efficiency with smaller land occupancy attracts increasing attention as a promising geothermal energy exploitation technique. With respect to a vertical BHE with extremely long length pipes buried underground, thermal analysis of the unsteady heat transfer process of the system is quite complicated. Due to the high temperature underground, the deeper part of BHE can extract more heat from the rock, which leads to a higher heat extraction rate. The heterogeneous distribution of heat flux density and geothermal gradient cannot be described properly by the existing analytical models. Although a full 3D numerical solution can reflect these features, it always requires high computational resources and presents numerical instabilities. In this paper, we propose a hybrid modeling method with high efficiency to simulate the temperature evolution inside the DBHE, and the heat propagation front in the surrounding rock mass. The temperature evolution inside the DBHE is solved by finite difference schemes, while the heat propagation in the surrounding rock is determined by an analytical formulation of thermal impacted radius. The coupling is achieved via source/sink term by incorporating the heat flux between the DBHE and the surrounding rock. Furthermore, an innovative analytical formulation describing the heat flux density is also presented, which accounts for the key parameters affecting the thermal performance of the DBHE system. Our proposed model is further verified against results with full 3D numerical solution under the same configurations. It is demonstrated that the proposed model can capture the key physical process of the heat transfer problem, while maintaining the calculation accuracy required by the engineering application. Regarding the calculation speed, the model results are around 30 times faster when compared to the full 3D numerical solution.
WOS关键词LINE SOURCE MODEL ; COUPLED HEAT ; PUMP SYSTEMS ; FIELD-TEST ; PERFORMANCE ; SIMULATION ; TIME ; FLOW ; GROUNDWATER ; GHES
资助项目"Transformation Technologies for Clean Energy and Demonstration", Strategic Priority Research Program of the Chinese Academy of Sciences[XDA 21020202]
WOS研究方向Energy & Fuels ; Geology
语种英语
WOS记录号WOS:000542740200001
出版者SPRINGER
资助机构"Transformation Technologies for Clean Energy and Demonstration", Strategic Priority Research Program of the Chinese Academy of Sciences ; "Transformation Technologies for Clean Energy and Demonstration", Strategic Priority Research Program of the Chinese Academy of Sciences ; "Transformation Technologies for Clean Energy and Demonstration", Strategic Priority Research Program of the Chinese Academy of Sciences ; "Transformation Technologies for Clean Energy and Demonstration", Strategic Priority Research Program of the Chinese Academy of Sciences ; "Transformation Technologies for Clean Energy and Demonstration", Strategic Priority Research Program of the Chinese Academy of Sciences ; "Transformation Technologies for Clean Energy and Demonstration", Strategic Priority Research Program of the Chinese Academy of Sciences ; "Transformation Technologies for Clean Energy and Demonstration", Strategic Priority Research Program of the Chinese Academy of Sciences ; "Transformation Technologies for Clean Energy and Demonstration", Strategic Priority Research Program of the Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/96628]  
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Pang, Zhonghe
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, 19 BeiTucheng West Rd, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Inst Appl Phys & Computat Math, Beijing 100094, Peoples R China
推荐引用方式
GB/T 7714		 Zhao, Yazhou,Pang, Zhonghe,Huang, Yonghui,et al. An efficient hybrid model for thermal analysis of deep borehole heat exchangers[J]. GEOTHERMAL ENERGY,2020,8(1):31.
APA Zhao, Yazhou,Pang, Zhonghe,Huang, Yonghui,&Ma, Zhibo.(2020).An efficient hybrid model for thermal analysis of deep borehole heat exchangers.GEOTHERMAL ENERGY,8(1),31.
MLA Zhao, Yazhou,et al."An efficient hybrid model for thermal analysis of deep borehole heat exchangers".GEOTHERMAL ENERGY 8.1(2020):31.

入库方式： OAI收割

来源：地质与地球物理研究所

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