Solar Furnace
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Uploader Comments (wuberman)
All Comments (19)
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So you're pulling cold air from your basement and returning it hot into the basement to basically keep your floors warm?
I was thinking of doing what you did but ducting the heat into the living space. Would that work?
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@wuberman What kind of insulation would you recommend? I want to insulate mine, but don't want melting foam everywhere either lol. Awesome heater!
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I don't like the idea of blowing air I'd breathe over hot painted objects.
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Consider a 2'x2'x5' box filled with 4 - 6" rocks paint it all black. Fully insulated or with one side glassed in & taking sun. Flow your heated air thru & it will act like a heat sink/store.
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just wut wuber says. i tried a simple test with 3 brown glass bottles in a sunny windowsill,1 with air ,one with water and 1 with sand.
the water is the most efficient at retaining heat, while the air heats up fast and cools down even faster. the sand is about right in the middle.
2 years ago 2
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Hi, any update on adding sand or water, etc. to the can solar air collector? Any efficiency difference? Thanks!
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Nice work.
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If I were to do this over again, the foam insulation would be gone. Use something more temperature stable.
wuberman 2 years ago
This solar furnace is now disconnected. It worked as advertized while in operation. The foam liner behind the cans expanded enough to pop the silicone seal out at the bottom and middle so it's no longer sealed.The white vinyl hoses cracked and are unable to move air anymore. I'm thinking of a second attempt with the same frame using copper pipe embedded in cement as a thermal mass, with no glass involved. Thinking it through right now.
wuberman 2 years ago
Did you use Lexan or glass, and how did you seal/attach it?
raynman66 2 years ago
I had a storm door with two pieces of tempered glass which had broken off it's hinges so I used the glass. I routed the edge the same thickness of the glass then put a bead of clear silicone in the trough set the glass in and held with clear packing tape. I over lapped the glass in the middle about an inch.
wuberman 2 years ago