墙体传湿对内表面温度的影响关系研究

Influence of moisture transferring on inner surface temperature wall bodies

建立了以相对湿度和温度为驱动势的热湿耦合传递数学模型,并对模型准确性进行了验证.以松木板墙和砖墙为例,利用所建数学模型对其在不同热湿环境下进行计算分析,结果发现:在稳态条件下,松木板墙内表面温度比未考虑传湿情况最多低1.4℃,砖墙内表面温度比未考虑传湿情况最多低0.7℃;在周期性边界条件下且不考虑传湿时,松木板墙和砖墙内表面温度始终高于室内空气温度,考虑墙体传湿时,墙体在白天有部分时间段内表面温度低于室内空气温度,有利于室内热环境的改善;松木板适合在室内空气含湿量变化幅度较大的地区作墙体材料,而砖适合在干燥且室内空气含湿量变化幅度较小的地区作墙体材料.

A dynamic mathematical model of coupled heat and moisture transfer through a wall body was proposed,choosing the relative humidity and temperature as the driving potentials.The model accuracy was verified by the experimental data.Taking pine wood and brick for examples,their heat transfer process under different hot wet environment were calculated using the mathematical model.The results show that in the steady-state condition,the inner surface temperatures of pine wood and brick are lower 1.4 ℃ and 0.7 ℃ or so than those without considering the moisture transfer process respectively.In the periodic boundary conditions,taking the moisture transfer process into account,the inner surface temperatures of pine wood and brick are lower than indoor air temperature in a period of time coincides with the working hours,which is beneficial to improve the indoor thermal environment.When the moisture transfer process is not taken into account,the wall inner surface temperature is always higher than indoor air temperature.The pine board is recommended as wall material in humid or dry areas with larger variation range of indoor air moisture content,and the brick is recommended as wall material in dry areas with smaller variation range of indoor air moisture content.