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11-29-08, 10:59 AM | #1 |
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DIY Solar Water Heating Using Fresnel Lenses
The people over at Green Power Science have whipped up this great video showing how to use Fresnel lenses to heat water. As they mention at the end of the video, your lens pointing at a black object will generate as much heat as a black object the same size as the lens, but I [...]
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