29 Mar '12, 9am

Window Performance – the Magic of Low-e Coatings

Last week I wrote about the early strategies window manufacturers employed to improve energy performance: adding extra layers of glass and increasing the thickness of the airspace between the layers of glass. This week we'll look at a more revolutionary change to window design that appeared in the 1980s: low-emissivity Amount of heat radiation emitted from a particular body or material. Emissivity is expressed in a fraction or ratio, with the lowest values indicating low emissivity and the highest indicating the high emissivity of flat black surfaces. coatings. Make no mistake. The introduction of low-emissivity (low-e) coatings was indeed revolutionary. A lot of the initial work on low-e coatings was funded by the U.S. Department of Energy — demonstrating a role that the federal government should continue to play. A friend of mine, the late Blair Hamiliton (who later foun...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/energy-sol...

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