为了遮阳常在窗户外侧设置不同种类的水平、垂直或综合式遮阳板或进行绿化处理,或在窗户内侧采用卷帘、软百页帘、窗帘等。这些措施都有不同程度效果,但也有某些缺点和局限性。如玻璃幕墙建筑,上述外部遮阳措施就很难实施。目前较多的大型公共建筑采用价格昂贵的染色玻璃。但这种玻璃吸热后向室内传递相当热量和对室内进行二次辐射,效果不好。近些年来,在国外流行一种玻璃防热片作为遮阳措施。这种防热片是用喷镀过金属的聚脂薄膜和一张透明的染色塑料薄膜层压而成。它贴附于玻璃之上,反射率可达80%,象“镜面”一样将阳光反射出去达 For the shading, different kinds of horizontal, vertical or integrated sun visors or greening treatments are often installed on the outside of the windows, or roller blinds, soft venetian blinds, and curtains are used inside the windows. These measures have different degrees of effect, but they also have some drawbacks and limitations. Such as glass curtain wall construction, the above external shading measures are difficult to implement. At present, more expensive large-scale public buildings use expensive stained glass. However, this glass absorbs heat and transfers considerable heat to the room and reradiates the interior to the room. The effect is not good. In recent years, a glass heat shield has been popular as a sunshade measure in foreign countries. The heat shield is a laminate of a metallized polyester film and a transparent, dyed plastic film. It is attached to glass and has a reflectance of up to 80%, reflecting the sunlight like a mirror.