Posted by TimV on January 28, 2010 at 17:14:18 from (67.242.35.218):
In Reply to: Re: Solar Heat posted by old on January 28, 2010 at 16:50:27:
Old: here's one I made--less than $100 in the whole thing, and it easily saved that the first winter. Old window with foam insulation around it, plywood backing, sheet aluminum painted black for a heat absorber, pine boards for heat baffles, and hung the whole thing on a south-facing wall on my trailer. In full winter sun I can get 120+ air coming out of the heater. One good website is Build It Solar--lots of real-world projects and friendly people willing to share their ideas--a lot like this site.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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