多层墙体热湿迁移数值模拟  

Numerical Simulation of Heat and Moisture Migration in Multilayer Walls

作　　者：张潇 刘芳[1] 李子淳 王泽林 ZHANG Xiao;LIU Fang;LI Zichun;WANG Zelin

机构地区：[1]山东建筑大学热能工程学院,山东济南250101 [2]济南市莱芜新奥燃气有限公司,山东济南271100

出　　处：《煤气与热力》2022年第10期17-21,共5页Gas & Heat

基　　金：国家自然科学基金项目“多孔调湿墙体内部热湿耦合传递研究”(12240201)。

摘　　要：以4层复合墙体为例,在室外空气温湿度正弦变化、室内空气温湿度固定条件下,对墙体外壁面、分层界面(由室外到室内分为界面1~3)、内壁面的温度、热流密度、单位面积热阻、含湿量的变化进行分析。朝向室外的墙面为外壁面,朝向室内的墙面为内壁面。界面1为水泥砂浆层与离心玻璃棉保温层界面,界面2为离心玻璃棉保温层与红砖层界面,界面3为红砖层与水泥砂浆层界面。外壁面、界面1、界面2温度主要受室外温度影响,界面3、内壁面温度主要受室内温度影响。界面1热流密度在3 h前增大,3 h开始逐渐降低,之后呈正弦波动,与室外温度变化同步。界面2热流密度始终为正,在4 h前非常小,4 h后呈正弦波动,变化滞后于室外温度。界面3热流密度在1 h前增大,然后逐渐减小并趋于0,始终为正值。考虑传湿时,界面1~3单位面积热阻比忽略传湿时略小。界面2的单位面积热阻大于界面1、3,且变化最小。界面1含湿量受室外空气相对湿度影响明显,与室外相对湿度变化相比,存在一定延迟。Taking a 4-layer composite wall as an example, under the conditions of sinusoidal change of outdoor air temperature and humidity and fixed indoor air temperature and humidity, the changes of temperature, heat flux density, thermal resistance per unit area and moisture content of the outer wall surface, the layered interface(divided into interfaces 1-3 from outdoor to indoor),and the inner wall surface are analyzed. The wall surface facing the outdoor is the outer wall surface, and the wall surface facing the indoor is the inner wall surface. The interface 1 is the interface between the cement mortar layer and the centrifugal glass wool insulation layer, the interface 2 is the interface between the centrifugal glass wool insulation layer and the red brick layer, and the interface 3 is the interface between the red brick layer and the cement mortar layer. The temperature of the outer wall surface, the interface 1 and the interface 2 is mainly affected by the outdoor temperature, and the temperature of the interface 3 and the inner wall surface is mainly affected by the indoor temperature. The heat flux density of the interface 1 increases before 3 h, begins to decrease gradually at 3 h, and then shows a sinusoidal fluctuation, which is synchronized with the outdoor temperature change. The heat flux density of the interface 2 is always positive, very small before 4 h, and shows a sinusoidal fluctuation after 4 h, and the change lags behind the outdoor temperature. The heat flux density of the interface 3 increases before 1 h, then decreases gradually and tends to 0,which is always positive value. When the moisture transfer is considered, the thermal resistance per unit area of the interfaces 1-3 is slightly smaller than that when the moisture transfer is ignored. The thermal resistance per unit area of the interface 2 is greater than that of interfaces 1 and 3,and the change is the smallest. The moisture content of the interface 1 is significantly affected by the relative humidity of the outdoor air, and there is a

关 键 词：多层墙体 热湿迁移 单位面积热阻 含湿量 

分 类 号：TK124[动力工程及工程热物理—工程热物理]