太阳能反射指数随着年龄的增长而改变(用于屋顶材料) - SRI可能会增加吗?
Looking at high(er) solar reflectance index shingles for a replacement residential roof in Maryland – generally, I would expect the SRI of the materials to stay the same or decrease slightly with age, but I’m seeing some products (at coolroofs.org) where the SRI actually increases at 3 years – is this reasonable?
答案
一般来说,当暴露在阳光下时,廉价的外部涂料“淡化”。通过阳光曝光使保持黑暗和不要“漂白”的颜料是困难的。所以是的,SRI上升是合理的,因为颜色变得更轻。一个白色或较暗的颜色可能会变得更加越来越靠近白色的反射率,但真正的亮白只能变得更糟,而褪色的白色永远不会像新的明亮白色一样高。