开窗是非住宅建筑能耗的最重要的围护结构设计决定因素。本文介绍了在典型的冷热气候条件下，在采光办公楼中，低辐射率（low-E）与传统照明相比，对一系列窗墙比的能源使用效果的评估。Low-E嵌装玻璃比传统嵌装玻璃传递“更冷”的日光，因为在给定的可见光透过率下，它们反射的入射太阳红外辐射要大得多。因此，我们使用可见光透射率与阴影系数之比（我们将其定义为Ke）来比较代表性玻璃特性对组件和总建筑能耗、峰值电力需求和所需冷却设备尺寸的影响。 我们的结论是，低涂层隔热玻璃可以在炎热和寒冷气候下提供照明和冷却节能。在0.5到1.0范围内，Kes的增加可实现最显著的照明、冷却和总电能节约；更高的消费税会减少储蓄。low-E隔热玻璃装置的R值增加在寒冷气候下提供了显著的好处，在炎热气候下则不存在问题。Low-E嵌装玻璃也有助于在冬季提高室内环境的平均辐射温度，在夏季降低平均辐射温度，并提供更大的建筑设计自由度，而不会产生不利的能源后果。此外，这些嵌装玻璃较高的首件成本可能会被较小的冷却设备、能源和峰值功率带来的节约所抵消- 需求成本节约、租金改善带来的长期财务收益，以及居住舒适度提高带来的生产力提高。单位:双引文:研讨会，ASHRAE交易，1987年，第93卷，第。1，纽约州纽约市

Fenestration is the most significant envelope design determinant of energy use in nonresidential buildings. This paper presents our assessment of energy use effects of low-emissivity (low-E) versus conventional ings for a range of window-to-wall ratios in a daylighted office building, in representative hot and cold climates. Low-E glazings transmit "cooler" daylight than their conventional counterparts because, for a given visible transmittance, they reflect a much larger fraction of incident solar infrared radiation. We thus use the ratio of visible transmittance to shading coefficient, which we define as Ke, to compare the effect of representative glazing characteristics on component and total-building energy use, peak electrical demand, and required cooling equipment sizes.We conclude that insulated glazings with low coatings can provide lighting and cooling energy savings in both hot and cold climates. The most dramatic lighting, cooling, and total electricity energy savings are achieved for increases of Kes within the range of 0.5 to 1.0; higher Kes provide diminishing savings. The increased R-value of low-E insulated glass units provides significant benefits in cold climates and is not a liability in hot climates.Low-E glazings also help increase the mean radiant temperature of interior environments in winter and reduce it in summer, and provide greater architectural design freedom without adverse energy consequences. Further, the higher first costs of these glazings may be more than offset by savings from smaller cooling equipment, energy and peak-demand cost savings, long-term financial gains from better rentals, and increased productivity due to improved occupant comfort.Units: Dual