多层墙体的热湿迁移特性分析

Analysis of heat and moisture transfer characteristics of multilayered wall

建立以相对湿度和温度为驱动势的多层墙体的热湿耦合传递数学模型,运用COMSOL软件求解热湿耦合迁移方程,以水泥砂浆—混凝土(黏土砖)—水泥砂浆多层墙体为例,分析了多层墙体在热湿环境下的温度分布和相对湿度分布。结果发现:在外表面区域混凝土墙体温度低于黏土砖墙体,在内表面区域混凝土墙体高于黏土砖墙体,而相对湿度的分布正好相反,黏土砖墙体的保温隔热作用更好,有利于降低建筑的能耗损失。

A dynamic mathematical model of coupled heat and moisture for multilayer wall was established by using relative humidity and temperature as the driving potentials. COMSOL simulation software was used to solve the equations. Taken the mortar-concrete（ clay brick）-mortar as an example,the distribution of temperature and relative humidity of the multilayer wall were analyzed in the heat and humidity environment. The simulation results indicated that the temperature of concrete wall was lower than clay brick wall at the outer surface,the temperature of concrete wall was higher than clay brick wall at the inner surface. And the distribution of relative humidity was opposite to temperature. So clay brick wall has better insulation property and it was conducive to reducing the building energy consumption.