基于线热源模型的垂直U型埋管换热器的换热分析  

Analysis on Heat Transfer of Vertical U-tube Ground Heat Exchangers Based on Line Heat Source Model

作　　者：张景欣[1] 彭冬根[1] 魏昊然 申传涛[1] 

机构地区：[1]南昌大学,江西南昌330031

出　　处：《流体机械》2015年第4期75-79,共5页Fluid Machinery

基　　金：国家自然科学基金项目(51266010);江西省科技支撑计划项目(20123BBG70195)

摘　　要：为了研究U型地埋管换热,以线热源模型作为基础,以夏季制冷工况为例,运用C语言编程软件对其进行了分析求解。研究了运行时间、换热介质的流量、土壤物性、埋管深度对U型埋管传热的影响以及周围土壤温度分布变化规律。模拟结果表明:当换热介质流量和埋管深度均增大3倍,土壤导热系数增大1.6倍时,单位管长换热量变化幅度分别为9.9%、-10.7%、23.3%。研究结果可为U型垂直埋管换热器的优化设计提供参考。In order to study the U-tube ground heat exchangers,a mathematical model based on line source model was built and by using C programming language,the effects of running time,flow-rate of heat transfer medium,soil properties and depth of U-tube on U-tube heat transfer and variation of soil temperature distribution around U-tube were investigated under a refrigeration operating condition in summer.The results of simulation show that when the heat transfer medium flow-rate and depth of buried pipes are increased by 3 times and soil thermal conductivity is increased by 1 .6 times,variations of heat transfer per unit length are 9.9%,-10.7%,23.3%.These study results can provide reference for design of the vertical buried U-tube heat ex-changer.

关 键 词：土壤源热泵 垂直 U 型地埋管 线热源模型 数值模拟 

分 类 号：TH137.8[机械工程—机械制造及自动化]