竖直U形地埋管换热器传热热阻计算方法比较  

Comparison of Vertical U-Tube Ground Heat Exchanger Thermal Resistance Calculation Methods

作　　者：陈超[1] 王永菲[1] 任艳[1] 陈疆[1] 韩云全[1] 王春学[1] 

机构地区：[1]北京工业大学建筑工程学院建筑环境与设备工程学科部,北京100124

出　　处：《湖南大学学报（自然科学版）》2009年第S2期58-62,共5页Journal of Hunan University:Natural Sciences

基　　金：国家十一五科技支撑计划(2007BKA12B07)

摘　　要：介绍了基于线热源理论和柱热源理论的竖直U形地埋管换热器的设计计算方法.结合工程实例,采用不同计算方法,对设计热阻参数项进行了比较.结果表明:关于钻孔内热阻,一维导热模型最大,形状因子法次之,二维导热模型最小,准三维传热模型略大于二维导热模型,最小值较最大值小32%(单U管)和44%(双U管);关于钻孔外热阻,柱热源理论较线热源理论小16%(单U管)和19%(双U管);关于钻孔总热阻,将4种钻孔内热阻计算方法和2种钻孔外热阻计算方法自由组合,最小值较最大值小20%(单U管)和26%(双U管).This paper analyzed the design methods of the vertical U-tube ground heat exchanger(VGHE) based on the line-source model(LSM) and cylindrical-source model(CSM).By a project example and adopting different calculation methods,the thermal resistance was compared.The results show that the borehole inside thermal resistance(BITR) obtained by 1-D model is the largest,the BITR by Shape Factor is the second,the BITR by 2-D model is the smallest,and the BITR by quasi-3-D model is almost the same as the BITR by 2-D model;for the single U,the min BITR was 32% less than the max BITR,and for the double U,the min BITR was 44% less than the max BITR.The borehole outside thermal resistance(BOTR) obtained by the CSM is 16% less than that by LSM for the single U,and the BOTR obtained by the CSM is 19% less than that by LSM for the double U.And combining the four BITR calculation methods with the two BOTR calculation methods,the min borehole total thermal resistance obtained was 20% less than the max for the single U,and for the double U,the min was 26% less than the max.

关 键 词：竖直U形地埋管换热器 传热热阻 计算方法 比较分析 

分 类 号：TU831.4[建筑科学—供热、供燃气、通风及空调工程]