地下水渗流对双U型地埋管换热器的模拟研究

A Study of Double U-shaped Ground Heat Exchanger Simulation of Groundwater Seepage

为确定地下水渗流对双U型地下埋管换热器换热性能的影响,利用FLUENT软件建立实际尺寸的双U型埋管钻井换热模型和周围土壤多孔介质模型,分别对土壤中无地下水渗流和有地下水渗流且渗流速度为2×10-6m/s时对换热器换热量和地下土壤温度场影响进行模拟研究。结果表明:在其它工况不变情况下仅改变地下水渗流速度(由0m/s到2×10-6m/s),埋管流体出口温度随着渗流速度的增大而减小,埋管的进出口温差相应的随着渗流速度的增大而增大,导致双U型埋管与土壤间的换热量越来越大,地下水渗流增强了双U型埋管的换热能力。

In order to determine the effect of groundwater seepage on the heat transfer performance of double U-shaped buried tube heat exchanger, the heat transfer model of double U-shaped buried pipe drilling and the porous media model of surrounding soil were established using FLUENT software. The effects of heat exchanger heat transfer and soil temperature field on the heat transfer of the heat exchanger were simulated when the seepage rate was 2×10-6 m/s and there was no groundwater seepage in the soil. The results show that when the flow velocity of groundwater is changed only in other conditions（from 0 m/s to 2×10-6 m/s）, the outlet temperature of buried pipe decreases with the increase of seepage velocity, and the temperature difference between inlet and outlet of buried pipe increases with the increase of seepage velocity. As a result, the heat transfer between double U-type buried pipe and soil is increasing, and the heat transfer capacity of double U-shaped buried pipe is enhanced by groundwater seepage.