南方热湿气候地区温度对墙体热湿性能的影响

Effect of Temperature on Moisture Transfer of Normal Wall in Hot and Humid Climate in South China

以多孔介质的传热传质理论为基础,建立以温度和相对湿度为驱动势的墙体热湿耦合传递主模型,在主模型的基础上忽略温度梯度的影响建立子模型。以轻型墙体和红砖墙体为例,利用所建模型对其在不同工况下进行分析计算。结果表明:红砖墙体的显热流量约为轻型墙体的7倍,湿流量约为2倍。轻型墙体具有更好的保温隔湿的作用。湿传递方程是否考虑温度梯度的作用,对墙体的全热负荷影响不大,但是会影响室内的湿负荷。对比发现,在不考虑温度梯度作用下轻型墙体湿流量降低82.2%,红砖墙体降低32.7%。

Based on the theory of heat and mass transfer in porous media, the main model of heat and moisture coupled transfer was established by using temperature and relative humidity as the driving potentials. A sub model is established by assuming that the temperature gradient is 0 in the moisture transfer equation based on the main model.Taking the light wall and red brick wall as an example, the models were used to analyze and calculate under different working conditions. The results show that the sensible heat flux of the red brick wall is about 7 times of that of the light wall, and the wet flux rate is about 2 times. The light wall has a better insulation performance. Whether the temperature gradient was considered in the moisture transfer equation has little effect on the total heat load of the wall, but it will affect the indoor humidity load. The comparison shows that the wet flux rate of lightweight wall decreases by 82.2% and the red brick walls decrease by 32.7% without considering the temperature gradient.