Enhanced Phase Change Heat Storage of Layered Backfill Body under Different Boundary Conditions  

作　　者：ZHANG Xiaoyan ZHAO Min LIU Lang ZHAO Yujiao HUAN Chao ZHANG Bo 

机构地区：[1]Energy School,Xi'an University of Science and Technology,Xi'an 710054,China [2]Key Laboratory of Western Mines and Hazards Prevention,Ministry of Education of China,Xi'an 710054,China

出　　处：《Journal of Thermal Science》2023年第3期1190-1212,共23页热科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51974225,51874229,51674188,51504182,51904224,51904225,51704229);Shaanxi Innovative Talents Cultivate Program-New-star Plan of Science and Technology(No.2018KJXX-083);Natural Science Basic Research Plan of Shaanxi Province of China(Nos.2018JM5161,2018JQ5183,2015JQ5187,2019JM-074);Scientific Research Program funded by the Shaanxi Provincial Education Department(Nos.15JK1466,19JK0543);China Postdoctoral Science Foundation(No.2015M582685);Outstanding Youth Science Fund of Xi’an University of Science and Technology(No.2018YQ2-01)。

摘　　要：In view of the high temperature problem faced by mining activities,the coordinated mining of ore deposit and geothermal energy is a solution in line with the concept of green mining.The layered backfill body with finned double-pipe heat exchanger continuously exchanges heat with the surrounding thermal environment,which plays an effective role in gathering geothermal energy.In this paper,the heat storage process of each layered backfill body under different boundary conditions is simulated by Fluent.The results show the heat storage characteristic of layered backfill body can be significantly improved by adding fins to the double-pipe heat exchanger.On the whole,the heat storage effect of bottom layer backfill body(BLBB)is the best.The total heat storage capacity of top layer backfill body(TLBB),middle layer backfill body(MLBB)and BLBB with the finned double-pipe heat exchanger is 666.3 kJ,662.2 kJ,1003.0 kJ;1639.0 kJ,1760.8 kJ,1911.2 kJ and 1731.1 kJ,1953.3 kJ,1962.8 kJ respectively at 1 h,8 h and 24 h.This study explores the law of heat storage of layered backfill body under different boundary conditions and also expands the idea for layered backfill body to efficiently accumulate geothermal energy.

关 键 词：layered backfill body boundary conditions phase change heat storage finned double-pipe exchanger geothermal energy of mine 

分 类 号：TK172[动力工程及工程热物理—热能工程]