Low-E玻璃对建筑节能的贡献

Contribution of Low-e Glass to Building Energy-saving

在《玻璃》2011年第7期《低辐射玻璃的概念与应用问题的讨论》的基础上,进一步讨论了Low-E玻璃的辐射系数对Low-E中空玻璃、Low-E充气中空玻璃和Low-E真空玻璃的隔热保温性能的影响,给出了有关计算结果,说明了Low-E中空玻璃的中间层厚度不应小于6mm。采用辐射系数E=0.25、中间层6mm的Low-E玻璃,可以满足北京地区建筑节能65%的要求。充填氩气等低导热气体取代空气,中空玻璃的保温性能有所提高。Low-E玻璃的辐射系数对Low-E真空玻璃传热系数的影响更大,真空玻璃虽然厚度比中空玻璃小很多,但传热系数更小,建筑节能效果更好。

The effect of low-e glass emissivity on thermal insulating of low-e insulating glaze, low-e gas-filled insulating glaze and low-E vacuum glaze was discussed on the basis of ＇discussion on concept and application issues of low-E glass＇ published on this Journal ‘Glass＇ No.7 of 2011 . Some calculated results were listed. It is concluded that the intermediate glass thickness of low-e insulating glaze should not be less than 6mm. It is pointed out that the 65% demands of building energy saving in Beijing region can be satisfied by employing thickness 6mm, and emissivity E=0.25 of intermediate glass. If the air in insulating glaze is replaced by argon or low thermal conductivity gases the heat preservation performance will be improved. The emissiveity of low-e glass affects heat transfer coefficient of low-e vacuum glaze far greater than the other insulating glaze . The thickness of vacuum glaze is much smaller than that of insulating glaze but its heat transfer coefficient is also far smaller than that of insulating glaze, therefore the building energy saving effect of vacuum glaze is much better than that of insulating glaze.