Wednesday, July 27, 2016

Metal Roofs Have Solar Advantage

Most of the energy on Earth comes from the sun. Sunshine reaching the earth’s surface, averaged over the entire planet, is about ¾ of a KWh per square foot per day. But that also includes energy filtered or reflected by the atmosphere and areas closer to the poles where the angle of light is highly oblique.  When there is bright sunshine at ground level, it rains down about 100 watts per square foot during the sunniest times of the day.

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