地埋管换热器运行工况下换热量变化特性的研究
Study of varying characteristics of the heat transfer in ground heat exchanger under operating conditions
摘要：
通过对土壤热阻的理论计算和地埋管换热器的数值模拟计算，获得了地埋管换热器的温差-换热量的变化关系。理论分析与现场实测结果均表明地埋管换热器的换热量随时间的变化分为快速变化段、平缓变化段、线性变化段三个阶段，拟合出了平缓变化段和线性变化段的单位延米换热量随介质与土壤传热温差的变化公式。
Abstract：
Through the theoretical calculation of thermal resistance of rock-soil and the numerical simulation of ground heat exchanger, obtains the variation relationship between the temperature difference and heat transfer of ground heat exchanger. Theoretical analysis and field measurement results show that the time-varying characteristic of the heat transfer of ground heat exchanger can be divided into three segments — rapidly varying segment, moderate varying segment and linear varying segment. Obtains the fitted formulas for heat transfer per running metre and temperature difference in moderate and linear varying segments separately.
Keywords:ground heat exchanger, time-varying characteristic, heat transfer per running metre