冬季北方地区多层墙体的热湿耦合性能研究

Study of Heat and Moisture Coupling Performance of Multilayer Walls in Northern Regions in Winter

文章关注了济南地区典型建筑的四层复合墙体内部的热湿传递过程,建立了以相对湿度和温度为驱动势的多层墙体二维非稳态热湿耦合数学模型,利用有限元法进行数值求解,重点分析了墙体内部及交界面处含湿量和热通量的变化。研究结果表明:水泥砂浆层与XPS保温层交界面处湿组分增加了0.114kg,其含量变化主要由液态水含量主导;水泥抹灰层与混凝土层交界面处水蒸气含量变化大于液态水变化;由相变引起的传热量占总传热量的27.2%。

The article focuses on the heat and moisture transfer process inside a four-layer composite wall under northern climate conditions.A two-dimensional transient air flow,heat and moisture coupling model of a multi-layer wall with relative humidity and temperature as the driving potentials is developed and solved numerically by using the finite element method.The changes of moisture content and heat flux inside the wall and at the interface are analyzed.The results show that:the wet component at the intersection of the cement mortar layer and XPS insulation layer increases by 0.114 kg,and its content change is mainly dominated by liquid water content;the change of water vapor content at the intersection of cement plaster layer and concrete layer is larger than the change of liquid water;the heat transfer caused by phase change accounts for 27.2%of the total heat transfer.