地源热泵垂直换热器的热响应测试与数值模拟

分析了进出口温度、速度和埋管深度等地源热泵垂直换热器换热性能的影响因素。在青奥村进行实地岩土热响应测试基础上，采用了GAMBIT建立双U形管换热器与周围土壤换热的物理模型，并用FLUENT进行了数值计算。结果表明，在科学的建立数学与物理模型基础上，得到的模拟结果与试验结果误差在10％之内，可以认为模拟结果是有效的，同时应该根据实际需要确定埋管深度，而不是盲目的增大埋管深度来增加换热量。

Thermal Response Test and Numerical Simulation of Vertical Heat Exchanger of Ground Source Heat Pump

The heat exchanger performance effects of ground-source heat pump vertical heat exchanger were determined, such as inlet and out- let temperature, speed and depth of buried pipe. Thermal response test was conducted at QINGAO village. A physical model of heat exchan- ging between doubl tube heat exchanger and the ambient soil was set up in GAMBIT. Computation mesh for the numerical simulation was generated in FLUENT. The results show that, compared to the experimental results, the error of the simulation results was within 10%. This demonstrated that the simulation was effective. The pipe depth should be determined according to actual needs, rather than increasing the heat exchange in a way of blindly increasing the pipe depth.