Posted by omahagreg on January 28, 2010 at 18:44:04 from (72.196.16.150):
In Reply to: Solar Heat posted by MTC on January 28, 2010 at 16:37:47:
In about 1980, Dad and I built an 8x8 forced air when we lived by North Sioux City South Dakota. We had aluminum baffles in it to make 9"x9" squares, then the whole thing was painted flat black. We did some research and found out the optimum sun angle in winter, so the bottom of the panel was away from the house approximately 3 feet, top was attached to the house. We used a furnace fan switch that had a 20 degree spread-came on at 110 degrees and off at 90 degrees. Used a furnace fan as well. It worked well, but we did end up doubling the collector size, as it seemed to be too small. Then we moved to Omaha, and still had some of the opaque panels. Dad's house had an attached porch on the south side, so he covered it with those panels. That porch worked WAY better than our designed collector, for WAY less effort. Greg
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