渗流条件下地埋管换热器传热特性研究

基于有渗流工况下地埋管管群的有限长线热源模型,通过Matlab软件模拟计算了深度为50 m平面处的地下温度场,根据地下温度场的温度分布,分析了布管方式,运行年限,孔隙率对地埋管管群传热效果的影响。研究表明:在物性参数,地埋管布管区域及地埋管总数不变的情况下,将地埋管等间距布置在布管区域内最有利于地源热泵系统的运行。地埋管布管区域冷热量累积效应在初始阶段较为明显,随着运行年限的增加,冷热量累积将在某一时刻达到动态平衡,此后将不随时间的增加而继续累积。对于冬夏季冷热负荷不平衡地区,孔隙率越大的区域越有利于地源热泵系统的运行。

Research on Heat Transfer Characteristics of Ground Buried Pipe Heat Exchanger under Seepage Condition

Based on the finite-length line heat source model of the buried pipe group under seepage conditions,the underground temperature field at a depth of 50 m,is simulated and calculated by MATLAB software.According to the temperature distribution of underground temperature field,the effects of pipe layout,operation life and porosity on the heat transfer effect of buried pipe group are analyzed.The research shows that when the physical parameters,the buried pipe layout area and the total number of buried pipes remain unchanged,arranging the buried pipes at equal intervals in the pipe distribution area is most conducive to the operation of the ground source heat pump system.The cold and heat accumulation effect in the buried pipe layout area is obvious in the initial stage.With the increase of operation years,the cold and heat accumulation will reach a dynamic balance at a certain moment,and thereafter will not continue to accumulate with the increase of time.For the area with unbalanced cooling and heating load in winter and summer,the area with larger porosity is more conducive to the operation of the ground source heat pump system.