12 Mar '12, 6am

White Roofs Cool the Heck out of NYC Apartments

White Roofs Cool the Heck out of NYC Apartments

The last time I wrote on white roofs, the finding was that they could actually cause a net cooling. But the study didn’t take into account how much the cooling of the buildings reduced electricity demand . Looks like those electricity savings can be huge from a new study on the matter by a Columbia University scientist and others. First, from the former white roofs study led by Mark Z. Jacobson, a professor of civil and environmental engineering at Stanford University: Jacobson’s computer modeling concluded that white roofs did indeed cool urban surfaces. However, they caused a net global warming, largely because they reduced cloudiness slightly by increasing the stability of the air, thereby reducing the vertical transport of moisture and energy to clouds. In Jacobson’s modeling, the reduction in cloudiness allowed more sunlight to reach the surface. The increased sunligh...

Full article: http://cleantechnica.com/2012/03/12/white-roofs-cool-the-...

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