武汉市住宅围护结构内表面冬季结露问题研究

Research of Condensation Issue on Internal Surface of Residential Building Envelope in Winter in Wuhan

在武汉市居住建筑围护结构热工设计中,存在忽略复核避免围护结构结露的最小传热阻的现象,导致住宅围护结构在冬季使用过程中内表面结露。该文根据《民用建筑热工设计规范》中规定的最小热阻计算方法,计算出武汉市建筑围护结构最小热阻,并与武汉市常见围护结构外墙热阻值进行比较评价,由此得出结论是:Ⅲ类围护结构外墙的热桥部和不采暖地下室上面的顶板处,采用Ⅰ型20mm厚玻化微珠保温材料,能够使设计满足热工规范要求。此外该文的研究成果对夏热冬冷地区其他城市的住宅项目也有一定的适用性。

This paper points out a design issue of residential building envelope in Wuhan,which is the minimum limit of exterior wall thermal resistance was ignored, condensation on the internal surface of building envelope would arise. By the minimum stipulated thermal resistance calculation from Civil Building Thermal Design Specification, we calculated the minimum thermal resistance of buildings envelope in Wuhan, and compared the above data with Wuhan common external wall thermal resistance. Thus we drew a conclusion that on the, exterior wall thermal bridge and the roof of the basement without heating inside, we can adopt the, vitrified microsphere thermal insulation material with a thickness 20mm ,this design meeting the requirements of the standard. Besides, the study is also available for projects in other cities with cold winter and hot summer.