极端热湿条件下含盐加气混凝土热湿传递特性

Heat and Moisture Transfer Characteristics of Salt-Containing Autoclaved Aerated Concrete under Extreme Heat and Humidity Climate

多孔建筑材料的湿物理性质是计算墙体传导负荷的重要输入项。盐分的存在会极大地影响多孔建筑材料的湿物理性质。然而,关于盐分对墙体传导负荷的影响却鲜有研究。因此以加气混凝土为例分析了盐分对导热系数的影响,通过COMSOL数值求解分析了稳态下的(含盐)加气混凝土墙体的热湿传递,并根据真实的室外气象数据分析了南海区域墙体的传导负荷。结果表明:在初始条件一样时,含盐墙体内的湿分更难散发出去。当含盐量为0.87%时,含盐墙体内部湿平衡所需时间延长了一倍;盐分的存在使得墙体的潜热和显热负荷明显增加。当含盐量为0.87%,潜热负荷的增加量为5.3%~21.0%,显热负荷的增量为4.2%~5.3%时,总传导负荷增量为4.1%~6.4%。

Reducing energy consumption in buildings in extreme hot and humid climates is urgent.However,little research has been done to investigate the loads on walls in this region when they contain salt.So the effect of salt on thermal conductivity is analyzed,using aerated concrete as an example,the heat and moisture transfer in a(salted) autoclaved aerated concrete wall in steady state is expounded by means of COMSOL numerical solutions,as well as the conduction loads of walls in the South China sea region based on real outdoor meteorological data.The results show that it is more difficult for moisture to escape from a salt-containing wall when the initial conditions are the same.At a salt content of 0.87%,the time required for wet equilibrium within the saline wall doubles;the presence of salt causes a significant increase in the latent and sensible heat load on the wall.With a salt content of 0.87%,the increase in latent heat load is 5.3%~21.0%,the increase in sensible heat load is 4.2%~5.3% and the increase in total conduction load is 4.1%~6.4%,respectively.