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阻容模型相对于解析模型及数值模型具有计算迅速、准确等优点,将其推广到地源热泵地埋管换热器计算当中后将易于埋管设计时采用。较为详细的给出了单U型地埋管换热器的钻孔内外的阻、容成分的计算方法,节点热平衡方程及求解方法。利用埋管换热实验台实测数据对所建立模型进行了校核,在模型参数取值合理情况下,模拟误差可控制在20%以内,满足工程计算需要。利用经过验证的模型对影响埋管换热的十个包括热物性、运行参数等多方面的因素进行了敏感性分析,分析表明土壤原始温度对换热量影响程度最大,土壤导热系数、体积热容其次,管长及管内流速则在一定范围内影响较大,回填材料导热系数相较于回填材料体积热容对换热量影响更大。
Compared with the analytical model and the numerical model, the RC model has the advantages of rapid calculation and accuracy. It is widely used in the design of buried pipe heat exchangers for GSHP. In more detail, the method of calculating the resistance and volume of the single U-shaped underground tube heat exchanger inside and outside the borehole, the node heat balance equation and the solution method are given. The established model was verified by using the measured data of the tube heat exchange test bench. Under the reasonable value of the model parameters, the simulation error can be controlled within 20% to meet the engineering calculation needs. The sensitivity analysis of ten factors including thermophysical properties, operating parameters and other factors that affect the heat transfer of the borehole was carried out by using the validated model. The analysis shows that the influence of the original soil temperature on the heat transfer is the greatest, and the soil thermal conductivity, volumetric heat Second, the tube length and tube flow rate within a certain range of greater impact, thermal conductivity of backfill material compared to the backfill volume heat capacity greater impact on heat transfer.