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钢窗以其强度高、价格低廉、安装较为方便等优点,广泛运用于居住建筑。为贯彻国家的节能政策,降低能耗,《民用建筑节能设计标准》(JGJ26—86)中,根据采暖期度日数,对窗户的传热系数提出了要求。设计时,当单层钢窗不能满足要求时,通常的作法是采用双层钢窗,即用普通单层钢窗安装两层窗户,一层外开,另一层内开。
Steel windows are widely used in residential buildings because of their advantages of high strength, low cost, and easy installation. In order to implement the national energy conservation policy and reduce energy consumption, the “Guidelines for energy saving design of civil buildings” (JGJ26-86) put forward requirements for the heat transfer coefficient of windows based on the number of days of heating period. When designing, when the single-layer steel window can not meet the requirements, the usual practice is to use double-layer steel window, that is, use ordinary single-layer steel window to install two-layer windows, one layer is opened outside, and the other layer is opened inside.