自保温体系外墙中柱热桥影响区域分析  

Analysis of the Influencing Zone of Thermal Bridge about the Middle Column in External Wall of Self-Insulation System

作　　者：戴绍斌[1] 倪青荣 马保国[1] 黄俊[1] 

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070

出　　处：《建筑节能》2015年第4期49-53,共5页BUILDING ENERGY EFFICIENCY

基　　金：国家科技支撑计划项目(2011BAJ03B03);武汉市科技计划项目(2014070504020242);武汉市城建科研项目(201213)

摘　　要：利用有限元软件ANSYS对加气混凝土砌块自保温体系的外墙中柱热桥进行了二维稳态数值分析,通过改变热桥柱外附保温层厚度、热桥柱尺寸及加气混凝土砌块类型,确定不同情况下外墙中柱的热桥影响区域,并对热桥影响区域内的热损显著程度进行了定量分析。研究表明,外墙中柱的热桥影响区域大小与外附保温层厚度有关,基本不受柱尺寸及墙体材料变化的影响,在保温层厚度不小于20 mm时,热桥影响区域为柱侧200 mm左右,且该区域内附加热流量占热桥引起的附加热流总量的比例可高达30%以上,热桥影响区域内热损较为显著。The thermal bridge about the middle column in self-insulation system of aerated concrete is studied by ANSYS with two-dimensional steady state model. The influencing zone of the thermal bridge is researched by changing the thickness of insulation layer, column size and block type; simultaneously, the significance level about the heat consumption of the influencing zone is analyzed in different conditions. The results show that the influencing zone is only related to insulation layer changing. When the thickness of insulation layer is not less than 20 mm, the influencing zone of middle column is about 200 mm on ei- ther side of the column, and where the proportion of heat loss contained in the additional heat loss from the thermal bridge can reach more than 30%. Therefore, the thermal heat dissipation from the influencing zone is significant.

关 键 词：二维稳态分析 自保温体系 热桥影响区域 热流损失 

分 类 号：TU111.4[建筑科学—建筑理论]