条形地埋管区域土壤换热特性的数值模拟

Numerical Simulation on Heat Transfer Characteristics of Soil around Ground-coupled Heat Exchangers Arrayed in Strip

本文以某客运站的地源热泵系统为例,对条形地埋管区域的土壤换热特性进行了数值模拟。通过模拟结果分析与比较了两种不同运行策略下全年土壤温度的变化情况。就全年运行而言,地埋管的换热效率在高负荷间歇运行方式下优于低负荷连续运行。在高负荷间歇运行的方式下全年土壤温升也远小于低负荷连续运行的方式,土壤温度恢复特性相对更好。

With an actual ground-coupled heat pump system example in a passenger station, this paper presents numerical simulations on the heat transfer characteristics of ground-coupled heat exchangers arrayed in strip. The variation of the ground temperature around the year is analyzed and compared in two different operation modes. In intermittent operation mode under high load, it shows ground-coupled heat exchangers will have a better heat exchanging efficiency throughout the year than that of in continuous operation mode under low load. And in intermittent operation mode under high load, the temperature rise of soil throughout the year will be much lower than that of in continuous operation mode under low load. In other words, the former will lead to a better restoration characteristic of soil temperature.