严寒地区地源热泵地埋管周围土壤冻结影响因素的实验研究

为了研究影响地埋管周围土壤冻结的因素，文章建立了模拟严寒地区热失衡状态下地源热泵冬季运行情况的实验装置。实验研究了进口流体温度、土壤体积含水率和土壤初始温度对地埋管周围土壤冻结的影响。结果表明:进口流体温度变化改善了埋管周围的温度场，有利于埋管换热器换热；随着土壤初始温度升高，减小了土壤物性参数的变化，增加了地埋管换热器的换热量；土壤体积含水率的增加，强化了周围土壤与地埋管换热器的换热作用，有利于提高地埋管的出口流体温度和取热值。

An experimental study of the influence factors of soil freezing surrounding a buried pipe of ground source heat pump in a cold region

In order to examine the influence factors of frozen soil around a buried pipe, a test device of ground source heat pump is established to study the system performance under the condition of thermal imbalance in winter. The impacts of freezing soil around the buried pipe by the inlet fluid temperature, soil moisture content and initial soil temperature are examined experimentally. The results show that the temperature change in the inlet fluid can improve the temperature field and heat exchanger around the buried pipe. With the increasing initial soil temperature, the soil physical parameters reduce and the heat transfer capacity increases. The increase in the soil moisture content can strengthen the heat transfer between the surrounding soil and the buried pipe, which improves the outlet fluid temperature of the buried tube and heat value.