严寒地区地埋管换热器周围土壤冻结区域分布特征实验研究

发布时间：2019-06-04 05:48

【摘要】：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。
[Abstract]:An experimental device was established to simulate the operation of ground source heat pump in winter under the condition of soil thermal imbalance in severe cold region. The distribution characteristics of soil freezing area around the buried pipe were studied, and the average moving speed of frozen phase change front was given. The results show that the frozen area of soil is asymmetrical. When the inlet temperature of the fluid is-15 鈩，

本文编号：2492517