Building heat loss from the windows in the winter is great. According to U.S. statistics, building energy dissipated through windows accounts for about 30% of building energy consumption. Sweden accounted for the proportion of larger, about 70%. Our statistics show that about 50%. Practice at home and abroad proved to improve the insulation performance of building envelope, in particular, to improve the insulation properties of windows to prevent the building heat loss and the most economical, most effective way. The insulating glass in architectural applications play a key role. According to U.S. data reports, the high-rise office building with silver hollow glass windows per square foot per year of heating energy consumption 5494KJ per square foot than single-layer glass windows energy saving of about 2/3 (single-layer glazing annual heating energy consumption 17775KJ) .
    With the development of China's national economy, the state of environmental protection, energy conservation, and improve their living conditions have become increasingly demanding, and accordingly developed a number of technical regulations. "Energy conservation design standard" <JGJ26095>, 1995 as amended (hereinafter referred to as the new standard) require the building heating energy consumption 50% lower than the standard in the 1980s (including buildings bear 30% of the heating system to undertake 20%), The heat transfer coefficient of the materials, windows and doors of buildings to extend this structure the new requirements.

    Heat transfer coefficient of the single-layer glazing DOUBLE GLAZING for 6W/m2.K single box of steel-plastic composite window heat transfer coefficient 3.5W/m2.K, single-frame double glass plastic window heat transfer coefficient was 2.6 W/m2. K. The windows of the heat transfer coefficient must be used in insulating glass below 2.5 W/m2.K.

    Under the new standards, Beijing, Tianjin, Shenyang, Dalian, using Shuangbo will be able to meet the requirements. But the double glass prone to condensation problems, especially when the double glass Mifengbuyan insulating layer of glass surface is easy to fogging affect performance. Thus, the insulating glass to replace the double glass window is an inevitable trend.

    Although the requirements of China's new standard on the heat transfer coefficient of windows than the original standard has been greatly improved, but compared with foreign there is a gap.

    The main problem for China's construction industry to the use of hollow glass increase in construction cost. Construction cost of the increase can be quickly recovered from the energy. By the planning department of buildings the use of hollow glass, technical and economic calculations show that the energy saving effect of the use of hollow glass of cold regions (Northeast, Inner Mongolia), in 4-5 years can compensate for the increase in construction cost.