垂直双U型地下换热器动态传热解析  

Dynamic thermal analysis of vertical double-U type ground heat exchanger

作　　者：罗勇强 许国治 LUO Yongqiang;XU Guozhi(School of Environmental Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学环境科学与工程学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2021年第1期122-127,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：中央高校基本科研业务费专项资金资助项目(2019kfyXJJS189)。

摘　　要：为改进传统基于二区域建模方法在地下换热器仿真中的不足,提出基于二元复合介质的垂直双U型地下换热器动态解析传热模型.在传统复合介质建模思路的基础上,引入地质分层复合介质等效处理方法,结合U型水管流体准动态传热解析函数及处理管壁非均匀热流条件的分段圆柱热源法,构建了系统动态传热解析新模型.与实验数据对比,新模型在40 h热响应测试中的平均相对误差仅0.17%.系统动态热特性分析中,利用新模型工具从可视化角度解释双U型地埋管内部的热堆积与热短路现象,为地下换热器的性能优化提供可靠支持.To overcome the shortcomings of traditional two-region method in simulation of ground heat exchanger,a dynamic analytical heat transfer model of vertical double-U type ground heat exchanger based on two-dimensional composite medium method was proposed.On the basis of inheriting the traditional modeling idea of composite-medium method,the equivalent treatment method of geological layered composite medium was introduced.Combined with the quasi-dynamic heat transfer analytical function of U-shaped water pipe and the method of segmented cylindrical heat source to deal with the non-uniform heat flow on water pipe wall,a new dynamic heat transfer analytical model was built.Compared with the experimental data,the average relative error of the new model in the thermal response test within 40 h is only 0.17%.In the analysis of the dynamic thermal characteristics of the system,the phenomenon of thermal accumulation and thermal short circuit inside the double U-shaped buried pipe can be explained visually by using the new model,which provides a reliable support for the performance optimization of the ground heat exchanger.

关 键 词：地源热泵 双U型地埋管 复合介质 解析传热 动态分析 

分 类 号：TU831[建筑科学—供热、供燃气、通风及空调工程]