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建立了模拟严寒地区土壤热失衡状态下地源热泵冬季运行情况的实验装置,实验研究了地埋管周围土壤冻结区域的分布特征,给出了冻结相变锋面的平均移动速度。结果表明,土壤冻结区域呈不对称性分布,流体进口温度为-15℃时,埋深为350、700、1 050mm,热响应区在40~60mm段,冻结锋面的平均移动速率分别为5、5、6.67mm/h,热响应区在60~80mm段,冻结锋面的平均移动速率分别为1.54、1.82、1.82mm/h;土壤冻结在一定程度上有利于地埋管与周围土壤之间的换热,在严寒地区地源热泵的设计中应考虑土壤冻结现象。
An experimental device was set up to simulate the winter operation of ground source heat pump under the condition of soil thermal imbalance in severe cold regions. The distribution characteristics of soil freezing zone around the buried tube were experimentally studied, and the average moving speed of freezing phase front was given. The results show that the soil freezing area is asymmetric distribution, the fluid inlet temperature of -15 ℃, the depth of 350,700,1 050mm, the thermal response zone in the 40 ~ 60mm section, the average front-end of the freezing moving rate of 5, 5,6.67mm / h, and the thermal response zone was 60-80mm. The average moving velocity of the frost front was 1.54, 1.82 and 1.82mm / h, respectively. Soil freezing was benefit to some extent between the buried pipe and the surrounding soil Heat exchangers should consider soil freezing in the design of ground source heat pumps in cold regions.