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Tags: air, passive, residential, solar, thermal
Permalink Reply by joe durrenberger on March 15, 2012 at 8:49am Martin,
Did you get the information you were looking for? I have some solar air heaters on my shop and garage. They are not passive in that they have a fan for circulation with thermostatic control. The 32 sq ft units generate about 50 degree of temperature rise at 100 cfm. I have made these units for other applications where the fan was 12VDC and powered by a 50w solar panel with no control. I found that if there was enough sun on the panel to run the fan, there was enough heat in the collector to generate the same 50 degree temp rise, at least down to air temps in the +20 degree range. I don't know what the upper limit is on output air temp, but I do know it has broken the bulb in an alcohol based thermometer.
I know these are not passive systems, but the DC fan and PV panel version requires no outside power or control so it has those same attributes as a passive system.
jd
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