天津地区双U型地源热泵地埋管换热器性能模拟研究

摘要

The changes of groundwater level have obvious influence on the performance of ground source heat pumps .For this purpose, a three-dimensional unsteady heat transfer model was built up .On the basis of the soil-water characteristic curve , the water content distribution in soil and thermal properties were determined on the vertical direction .For example, the performance of a double U-tube ground source heat exchanger in Tianjin was investigated by using CFD software FLUENT , and the results were compared with the experimental data .Especially, the effects of groundwater level were investigated on the performance of the heat exchanger in this context .The results could be used to guide the design and management of ground source heat pumps in the regions with obvious changes of groundwater level .%　　针对地下水位变化对地源热泵垂直地埋管换热器性能的影响，以天津某工程为例，根据土水特征曲线确定了土壤垂直方向含水量分布和热物性变化，并基于 FLUENT 软件建立了双 U 型地埋管换热器的三维非稳态传热模型，对不同工况下的换热器性能进行了数值模拟，将模拟结果与试验结果进行了对比分析。进一步，模拟研究了不同地下水位对换热器性能的影响，其结果对于地下水位变化显著地区地源热泵工程设计、管理具有较好的指导意义。