严寒地区外窗节能改造及节能性与经济性评价.doc

文档介绍：严寒地区外窗节能改造及节能性与经济性评价
吉林建筑工程学院白莉赵嵩颖
Cold regions of the energy-saving windows and energy-saving and economic evaluation
BAL li,ZhAO Song-Ying,
Jilin Architectural Engineering Institute,Changchun 130021,China;
摘要:外窗是住宅围护结构保温性能最薄弱的部位,外窗传热系数主要取决于玻璃、窗框型材的热工性能及其组合形式,它是外窗节能改造的主要指标。本文对严寒地区外窗传热的决定因素进行分析研究,计算出常用外窗的传热系数U值,同时对外窗改造的节能性与经济性进行了评价。
关键词:外窗改造;传热系数;节能性;经济性
Abstract: Outside the window of the residential building envelope insulation is the weakest part of the performance,Outside the window heat transfer coefficient is mainly decided by the glass, the window frame molding hot working performance and bination form ,It is outside the window of the main indicators of energy-saving. This article the window heat transfer determining factor carries on the analysis to the severely cold area outside,And windows used to calculate the heat transfer coefficient U value,At the same time, the external window of the energy transformation and economic evaluation.
Key words: Outside the window of the transformation ; Heat transfer coefficient ; Energy saving ; The economical
外窗是建筑物重要的组成部分,它与外墙、屋顶构成建筑物的外围护结构。外窗具有采光、通风、保温、隔热等作用,但外窗也是住宅围护结构保温性能最薄弱的部位。外窗传热由窗框的温差传热、窗户缝隙的空气渗透传热、玻璃的太阳辐射传热等部分组成,其总量高达整个采暖建筑热损失的50% [1]。因此,对既有建筑外窗的节能改造是降低建筑能耗的重要途径之一。
在进行既有建筑外窗节能改造时,由于外窗的朝向、窗墙比等参数已是固定且不易改变的,外窗节能的关键取决于玻璃的热工性能、窗框型材的种类及窗制作的质量。窗的制作质量直接关系到空气渗透传热量的大小,由外窗设计与施工技术所决定,是可以人为控制的,在保证窗的制作质量前提下,反映外窗隔热保温性能的传热系数U值