Quote:
Originally Posted by Mikesolar
It seems to me that the screen only sees maybe 40%-50% of the sunlight available to it so I can't see how it would be as efficient as a solid flat body. It is all about (1)surface area, (2)absorption and (3)emission.
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You use three layers. When Gary built it, I think three layers of fiberglass screen has the screen taking 79% of the sunlight. The rest hits the back of the collector and isn't lost if the back of the collector is rigid foam.