In the solar furnace I built, I have rows of old fluorescent lamp casings painted flat black and incorporated small 12V fans from tossed out PCs to move the air through the 'tunnels', alternating one end to the other. I also have the option to move the hot air through a heat exchanger inside the furnace to a separate coil. My biggest problem is that the sun in upstate NY is very rare and unlike the SVPs, which produce electricity even on cloudy days, I am disappointed with the amount of heat I actually capture.
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