透水地面热平衡的计算模型及实证研究

Calculation Model and Empirical Investigation of Thermal Balance of Pervious Ground

透水地面温度受到太阳辐射、表面对流换热、蒸发散热等多种因素影响,较难确定.文中在热量与湿度控制方程的基础上对透水地面与周边环境的换热过程进行了数值解析,推导出透水地面不同深度下的逐时温度计算模型,在此基础上编制计算程序计算透水地面温度,并与实测透水地面温度进行对比,发现数值计算值与实测值基本一致,最大相对误差在3.5%以内,说明推导得到的数值计算方法可作为预测透水地面温度的有效方法.文中还以此为基础引出等效太阳辐射吸收系数概念,该系数可直接用于评价不同含水率透水地面的太阳得热量.

Pervious ground temperature is difficult to estimate because it can be affected by many factors,such as solar radiation,surface convection heat transfer,evaporation and heat dissipation.Based on the heat and humidity control equation,the heat transfer process between the permeable surface and the surrounding environment was numerically analyzed,and the hourly temperature calculation model at different depths of the permeable surface was deduced.Then the calculation program was compiled to calculate the permeable surface temperature.The calcula-ted temperature was compared with the measured surface temperature.The results show that the numerical calculation value is basically in accordance with the measured value,and the maximum relative error is less than 3.5%.the study shows that the derived numerical method can be used as an effective method to predict the permeable surface temperature.Based on this,the equivalent solar radiation absorption coefficient concept is proposed,which can be directly used to evaluate the solar heat gain of permeable surface with different water content.