论文部分内容阅读
前言近几年来,由于木材短缺,我国民用建筑多以金属窗取代传统木窗。金属窗已成为当前主要的建筑窗型。据粗略统计,全国1984年金属窗年产量达三千余万平方米。其中钢窗占99％以上,铝窗占1％弱。由于用量巨大的钢窗气密性差,在外窗总耗热量中,空气渗透耗热量占主要比重。现依据质量合格产品的实测统计计算参数值和当前我国暖通界通用计算方法,对采暖地
Foreword In recent years, due to the shortage of wood, China’s civil buildings have replaced metal windows with traditional wooden windows. Metal windows have become the main current architectural window type. According to rough statistics, the annual output of metal windows in China reached more than 30 million square meters in 1984. Among them, steel windows accounted for more than 99% and aluminum windows accounted for 1%. Due to the poor air tightness of the steel window with a large amount of usage, the air-consumptive heat loss is the major proportion of the total heat consumption of the outer window. Based on actual measured statistical calculation values of quality products and the current general calculation method for heating and