Heat extraction from hot dry rock by super-long gravity heat pipe: Effect of key parameters

doi:10.1016/j.energy.2022.123527

GIEC OpenIR

	Heat extraction from hot dry rock by super-long gravity heat pipe: Effect of key parameters
	Huang, Wenbo 1; Chen, Juanwen 1; Cen, Jiwen1 ; Cao, Wenjiong 1; Li, Zhibin 1,2; Li, Feng 1,2; Jiang, Fangming1
	2022-06-01
发表期刊	ENERGY
ISSN	0360-5442
卷号	248 页码:13
通讯作者	Chen, Juanwen(chenjw@ms.giec.ac.cn) ; Jiang, Fangming(jiangfm@ms.giec.ac.cn)
摘要	Extracting hot dry rock energy by super-long gravity heat pipe in a single-well is a novel technical scheme proposed recently. The potential superiority of this scheme is related to its environmental friendliness, economic and technologic feasibility, but the key parameters affecting its performance are not well understood. To this purpose, a detailed sensitivity analysis using a dedicated numerical simulation model is conducted for a 4000 m long gravity heat pipe with water as the working fluid. The analysis considers a wide range of working conditions with the aim of better understanding the effects of operating and structural design variables. It is found that the thermal performance is strongly enhanced with the increasing heat pipe diameter (100 mm-50 0 mm), which is attributed not only to the increase of heat transfer surface but also to the decrease of fluid flow resistance inside the heat pipe. Lowering the condensation temperature improves the thermal performance of heat pipe, whereas the effect gradually reduces and becomes insignificant when the condensation temperature is less than ~50 degrees C. Thermal insulation shows the best positive effect when the insulation section reaches the position where the heat pipe temperature is just equal to the formation temperature. The low thermal conductivity of hot dry rock is confirmed to be a key bottleneck restraining the performance of the heat pipe system. The heat extraction rate can be greatly improved if the local equivalent thermal conductivity is enhanced in the region of 5 m in radius around the heat pipe. The acquired knowledge allows to develop a design strategy for practical super-long heat pipe systems taking into consideration the operating parameters and local geothermal conditions.
关键词	Hot dry rock Deep geothermal energy Super-long gravity heat pipe Single-well geothermal system
DOI	10.1016/j.energy.2022.123527
关键词[WOS]	THERMAL-CONDUCTIVITY ; WELLS ; PERFORMANCE ; SYSTEM
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Project of China[2018YFB1501804] ; National Key Research and Development Project of China[2019YFB1504104] ; Chinese Academy of Sciences Strategic-A Pilot Project[XDA21060700] ; Chinese Academy of Sciences Key Laboratory of Renewable Energy[E0290302] ; Guangzhou Science and Technology Plan Project[202102020245] ; Jiangyin Science and Technology Innovation Special Fund[JY0604A021015210001PB]
WOS研究方向	Thermodynamics ; Energy & Fuels
项目资助者	National Key Research and Development Project of China ; Chinese Academy of Sciences Strategic-A Pilot Project ; Chinese Academy of Sciences Key Laboratory of Renewable Energy ; Guangzhou Science and Technology Plan Project ; Jiangyin Science and Technology Innovation Special Fund
WOS类目	Thermodynamics ; Energy & Fuels
WOS记录号	WOS:000792590300001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：15[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/36461
专题	中国科学院广州能源研究所
通讯作者	Chen, Juanwen; Jiang, Fangming
作者单位	1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Lab Adv Energy Syst,CAS Key Lab Renewable Energy, Guangdong Key Lab New & Renewable Energy Res & De, Guangzhou 510640, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
第一作者单位	中国科学院广州能源研究所
推荐引用方式 GB/T 7714	Huang, Wenbo,Chen, Juanwen,Cen, Jiwen,et al. Heat extraction from hot dry rock by super-long gravity heat pipe: Effect of key parameters[J]. ENERGY,2022,248:13.
APA	Huang, Wenbo.,Chen, Juanwen.,Cen, Jiwen.,Cao, Wenjiong.,Li, Zhibin.,...&Jiang, Fangming.(2022).Heat extraction from hot dry rock by super-long gravity heat pipe: Effect of key parameters.ENERGY,248,13.
MLA	Huang, Wenbo,et al."Heat extraction from hot dry rock by super-long gravity heat pipe: Effect of key parameters".ENERGY 248(2022):13.