基于混合解换热模型的地源热泵系统井群热干扰特性  

Thermal interference characteristics of wells in ground source heat pump system based on analytical and numerical calculation of mixed solution

作　　者：王俊清[1] 袁艳平[1] 曹晓玲[1] 秦萍[1] 

机构地区：[1]西南交通大学机械工程学院,成都610031

出　　处：《农业工程学报》2016年第10期194-200,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：建筑环境与能源高效利用四川省青年科技创新研究团队项目(2015TD0015)

摘　　要：为建立井群换热快速求解模型并研究其热干扰特性,提出了一种基于解析-数值计算的混合解模型,以16井群为研究对象,通过试验和数值模拟的方法研究了井群热干扰特性。研究结果表明:随着换热的进行井群中各井间产生热干扰并逐渐增强,同一运行时刻中井受热干扰程度最大、边井次之、角井则最小;由于井间热干扰的影响,角井换热能力最大、井壁温度最低,边井换热能力和井壁温度居中,中井换热能力最小、井壁温度最高,则运行90 d时角井换热量比边井大6.5%,边井换热量比中井大7.1%;角井对井群换热量的贡献率随换热时间延长逐渐增加,中井对井群换热量的贡献率则逐渐减少,而边井对井群换热量的贡献率基本不变。In practical engineering, buried pipe is the form of well group. At present, there are two ways to calculate the heat transfer in a group of wells. One is to calculate the heat transfer of a single well, which is then directly multiplied by the number of holes to get the heat transfer of well group, without consideration of the thermal interference between wells.The other is the direct use of analytical solution or numerical simulation. The numerical solution of the powerful is good at calculating complex heat transfer problems, and can effectively grasp the dynamic heat transfer characteristics of buried pipe. The heat transfer space is large and the geometry configuration is complex, so the computation time is too long. In order to establish a heat transfer model of well group that can be quickly solved and used for thermal disturbance characteristics, the mixed solution heat transfer model based on analytical and numerical calculation is presented. The basic idea is to divide the space of the well group into the space inside borehole（including multiple drilling holes） and outside borehole taking the borehole wall as the boundary. Both steady-state analytical method and transient numerical heat transfer method are used to analyze the heat transfer characteristics inside and outside borehole respectively, and the 2regions are coupled by the borehole wall temperature. After the establishment of summer conditions of single drill pipe heat exchanger test-bed, and the verification of single well heat transfer model, the FLUENT software in combination with the heat transfer model of well group is used to further study the wells at 3 kinds of special positions in the square well group（middle well, edge well and corner well）, and the typical well group of physical model is determined and the thermal interference coefficient of the well group is defined. Finally, the thermal interference characteristics of the typical well group are studied mainly under the condition of continuous operation in summer. The resear

关 键 词：热泵系统 井群 传热 热干扰特性 

分 类 号：TK523[动力工程及工程热物理—热能工程]