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基于一维线热源理论,建立了同时考虑温度和含水量变化的土壤热湿传递线热源模型。针对地源热泵夏季运行工况下地埋管周围土壤温湿度的变化进行了数值模拟,结果显示,水分迁移对土壤含水量的影响主要集中在钻孔内。对模拟结果与一维热湿传递实验结果进行了对比,发现二者具有较高的相似性。数据拟合得到不同土壤初始质量含水量下对普通线热源模型地埋管换热量的修正公式。通过对不同埋深地埋管换热量的加权分析,认为当夏季平均地下水位高于-20m时,可以不考虑水分迁移引起的换热量偏差。
Based on the one-dimensional linear heat source theory, a heat source model of soil heat and moisture transfer line that takes into account the changes of temperature and water content is established. According to the numerical simulation of the change of soil temperature and humidity around the buried pipe under the operating conditions of ground source heat pump in summer, the results show that the influence of water migration on soil water content is mainly concentrated in the borehole. The simulation results and one-dimensional heat and moisture transfer experimental results were compared and found that the two have a high similarity. Data fitting to get the initial mass moisture content of different soil ordinary tube heat source model ground tube heat transfer correction formula. Through the weighted analysis of the heat exchange of buried pipes in different depths, it is considered that when the mean summer water table is higher than -20m, the deviation of heat transfer due to water migration may not be considered.