双U型地埋管换热器换热性能模拟分析  

Simulation and analysis of heat transfer performance of double U-tube ground heat exchangers

作　　者：杨培志[1] 陈嘉鹏 陈君文 李明 YANG Peizhi;CHEN Jiapeng;CHEN Junwen;LI Ming(School of Energy Science and Engineering,Central South University,Changsha 410083,China;China Aviation Changsha Design and Research Co.Ltd.,Changsha 410014,China;Hunan Linten Science and Technology Co.Ltd.,Xiangtan 410005,China)

机构地区：[1]中南大学能源科学与工程学院,湖南长沙410083 [2]中航长沙设计研究院有限公司,湖南长沙410014 [3]湖南凌天科技有限公司,湖南湘潭410005

出　　处：《中南大学学报（自然科学版）》2021年第6期1733-1738,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金面上资助项目(51276226)。

摘　　要：针对垂直双U型地埋管换热器,在MATLAB平台上建立热渗耦合作用下地埋管换热器的三维数值传热模型,并通过岩土热响应试验验证该模型的正确性。基于建立的三维数值传热模型,分析U型管内水流速度、回填材料热物性参数、地下水渗流速度及地下水水位对地埋管换热器换热性能的影响。研究结果表明:当U型管内水流速度从0.1 m/s增大到0.2 m/s时,可以明显提高地埋管换热器的换热性能;与增大导热系数相比,增大容积比热对提升地埋管换热器换热性能不明显;当地下水渗流速度从0 m/a增大到35 m/a时,地埋管换热器与土壤的换热效果明显;地下水位对地埋管换热器换热性能有较大影响。A three-dimensional numerical model of double U-tube ground heat exchangers(GHEs) was presented with heat transfer and groundwater seepage in MATLAB platform, which was verified by rock-soil thermal response test. Based on the established three-dimensional numerical heat transfer model, the influence of flow rate of U-shaped tube, thermophysical properties of grout, seepage flow rate and groundwater level on heat exchange performance of GHEs was analyzed. The results show that when U-tube water flow rate is from 0.1 m/s to 0.2 m/s,the heat transfer performance of the buried tube heat exchanger can significantly be improved. Increasing the volume specific heat to enhance the heat transfer performance of buried tube heat exchanger is not obvious compared to increasing the thermal conductivity. When groundwater percolation rate is from 0 m/a to 35 m/a, the buried tube heat exchanger with soil′s heat transfer effect is obvious. The depth of the groundwater level on the buried tube heat exchanger has greater impact on the heat transfer performance.

关 键 词：地埋管换热器 三维数值传热模型 地下水渗流 岩土热响应试验 

分 类 号：TK52[动力工程及工程热物理—热能工程]