【摘要】 通过对地源热泵换热器地下竖直埋管非稳态传热分析,提出了针对回填材料的热阻修正因子,并引入了热短路修正方法对循环水平均温度进行修正,同时在综合考虑对Carslaw柱源模型已有修正的基础上,提出了圆柱源综合修正模型.通过计算结果与实验数据的比较,证明了修正模型的准确性,并进一步分析了回填土、等价半径、热流不均匀、热短路等因素对土壤热物性参数计算结果的影响.更多还原

【Abstract】 A thermal resistance correction factor aimed at the backfill material of the borehole was developed by analyzing the unsteady heat transfer of vertical embedded pipe for ground source heat pump,and the heat short-circuit modification was introduced to modify the mean temperature of the circulating water. Meanwhile,a cylindrical source integrated modified model was developed based on the modification of the existing Carslaw cylindrical source model.The accuracy of the modified model was proved by the comparison of the calculation result and the experimental one,and the influence of the backfill grout,the equivalent radius,thermal ununiformity and the heat short-circuit on the result was also further analysed.更多还原