岩土分层对地埋管换热器传热影响的数值模拟  

Numerical Simulation Analysis of Borehole Heat Exchanger in Layered Rock-Soil

作　　者：王楠[1] 杨小凤[1] 庄春龙[1] 黄光勤[1] 付博亨 席新宇[1] WANG Nan YANG Xiao-feng ZHUANG Chun-long HUANG Guang-qin XI Xin-yu FU Bo-heng(Logistic Engineering University of PLA, Chongqing 401331, China)

机构地区：[1]后勤工程学院,重庆401331

出　　处：《兵器装备工程学报》2017年第4期188-191,共4页Journal of Ordnance Equipment Engineering

基　　金：重庆市基础与前沿研究项目(cstc2016jcyj A0496)

摘　　要：建立了地埋管钻孔外岩土体分层条件下三维非稳态传热模型,并用Fluent软件进行数值模拟;结果表明:因埋管周围岩土层热物性差异使流体沿程换热呈现非均匀的特点,导热系数较大的岩土位于上部时有利于地埋管换热,岩土层钻孔壁处温度趋于稳定的温度值和所经历的时间不同,岩土层热影响半径不同;建议工程设计取各层热作用半径最大值作为设计间距。A three-dimensional unsteady heat transfer model has been established,and the numerical simulation was carried out with Fluent software. Results indicate that the fluid along the heat exchanger is non-uniform characteristics,and the thermal conductivity coefficient higher soil at the top of ground is conducive to the heat exchanger. It took different length of time for the borehole temperature reach stable and the stable temperature are different in each layer,and the thermal radius of each layer is different,and it is suggested that the maximum thermal radius of each layer should be taken as the engineering design spacing.

关 键 词：地埋管 岩土分层 热影响半径 

分 类 号：TK521[动力工程及工程热物理—热能工程]