影响地埋管换热器侧换热量因素分析

利用线热源模型,结合约束最优化方法,使用河北工程大学自主研制的岩土热物性测试仪,测试并计算出石家庄市正定区岩土综合导热系数和地埋管侧换热量值。根据测试结果,分析实验中的测试时间、地埋管内进出口水温平均值、测试功率等因素对地埋管换热量的影响。测试结果表明：20 h后,测试计算出的岩土综合导热系数趋于稳定;岩土综合导热系数、地埋管内进出口水温平均值、测试功率对地埋管侧换热量值有影响,且影响依次减少。

The analyses on influence factors of heat transfer rate of u-tube ground heat exchanger

Based on the theory of line-heat-resource,the soil comprehensive thermal conductivity coefficient and heat transfer rate of u-tube ground heat exchanger are tested and calculated in Zhengding of Shijiazhuang aera with the constraint optimization method and using the soil thermal physical instrument produced by the Hebei University of Engineering.According to the experiment results,the impact factors of time step,average temperature of inlet,outlet u-tube ground heat exchanger and heating power on the heat transfer rate of u-tube ground heat exchanger were discussed.The results show that the comprehensive thermal conductivity of the soil tends to be stable after 20 hours;the comprehensive thermal conductivity of the soil,the average temperature of inlet and outlet u-tube ground heat exchanger,and the heating power could influence the heat transfer rate of u-tube ground heat exchanger,and the influence would reduce successively.