有渗流地埋管传热模型及快速算法  

A Heat Transfer Model of Geothermal Heat Exchangers with Groundwater Advection and Its Fast Algorithms

作　　者：陈友明[1] 张训水[1] 杜立志[1] 刘向伟[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2013年第1期15-20,共6页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51078127);新世纪优秀人才支持计划资助项目(NCET-06-0695)

摘　　要：考虑地下水渗流的地埋管传热模型能更精确地描述地埋管换热的实际工况,现有的考虑渗流的地埋管传热解析模型计算繁琐耗时.提出了计算速度更快的g-函数解析解,并利用该解析解进行模拟分析.结果表明,新的解析解在保证合理计算精度的同时,计算速度有了显著提高,钻孔壁中点温度g-函数较积分平均温度g-函数计算值偏大.在阶跃热流作用下,地下水渗流能显著改善地埋管换热工况.多钻孔埋管布置方式对钻孔域温度场有较大影响.The temperature response of geothermal heat exchangers （GHEs） can be described more ac- curately with heat transfer model with groundwater advection. Considering that the current analytical solu- tion model is time-consuming in calculati＇on, a new form of analytical solution of g-function was proposed, and the influence of groundwater flow on the heat transfer in GHEs was discussed. Computations indicate that the calculation efficiency of the new g-function has improved significantly while the reasonable accura- cy is maintained, and the value of middle point temperature g-function is larger than that of integral mean temperature g-function. Groundwater advection can improve the effectiveness of GHEs significantly for the step heating flux. The temperature distribution of borehole area is influenced greatly by the arrangement of multiple boreholes.

关 键 词：水平渗流 地埋管换热器 温度响应 算法 G-函数 

分 类 号：TK521.2[动力工程及工程热物理—热能工程]