渗流作用下U型垂直地埋管换热器工程设计与应用

Research and Application on Project Design of U-Pipe Vertical Ground Heat Exchanger with Groundwater Seepage

以南昌某地源热泵工程为例,阐述了地埋管管群在地下水渗流作用下的设计计算方法,利用Visual Basic.NET与Matlab语言混合编程进行地埋管换热器设计计算。结果表明地下水渗流的存在不一定能强化地埋管换热器的传热,当地下水渗流速度低、岩土孔隙率大时不利于地埋管散热,而当贝克利数数大、岩土等效导热系数高时有利于地埋管散热。

Taking a geothermal heat pump project in Nanchang as an example, the design calculation method of the buried pipe group under groundwater seepage is expounded, and the design calculation of the buried pipe heat exchanger is carried out by using Visual Basic.NET and Matlab language hybrid programming. The results show that the existence of groundwater seepage does not necessarily enhance heat transfer of buried heat exchanger, low groundwater seepage velocity and high porosity of rock-soil is not conducive to the heat dissipation of buried pipe, while large Peclet number and high effective thermal conductivity is beneficial to the heat dissipation of the buried pipe.