Posted by showcrop on March 12, 2013 at 05:09:12 from (75.67.231.80):
In Reply to: OT Solar heat posted by Bryan iniowa on March 12, 2013 at 04:53:05:
I designed and built an active collector that was part of the roof of the house that I added onto in 1978. It worked great! Especially in late Jan through March when the sun got higher, it might be 15 degrees out and the hot air would blast out of the duct. We had a manually operated diverter to the basement so that the excess would go down there and help us to stay warmer at night. I have seen vertical thermo-siphon collectors on south exterior walls where air is drawn in at the bottom and rises between what had been the outside surface and the back of the black painted absorber plate. I used corrugated aluminum roofing for the absorber, which was covered with Kallite fiberglass for the glazing. There are lots of plans available for low tech low cost but high performing solar collectors.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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