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tuckahoeneck: 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?
qcages: @wuberman What kind of insulation would you recommend? I want to insulate mine, but don't want melting foam everywhere either lol. Awesome heater!
Frosttty: I don't like the idea of blowing air I'd breathe over hot painted objects.
wuberman: If I were to do this over again, the foam insulation would be gone. Use something more temperature stable.
wuberman: 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.
jojo808: 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.
jeevespreston: Hi, any update on adding sand or water, etc. to the can solar air collector? Any efficiency difference? Thanks!
m3141592: Nice work.
wuberman: I am changing my mind on the use of something to add thermal mass, I now think it would be more useful. I think it would even out temperature swings. and allow longer usefulness.
wuberman: 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.
NWforager: a buddy just made this design for a window but with sand. It gets up to 130 in good sun and stays warmer than the room for hours after sun down. He is planning on building the sandless version for another window to gauge the difference. .I'm planning 1 with green or brown beer bottles full of water. Keep you posted if youre interested .
wuberman: Two solar panels are Motomaster Eliminater from Canadian Tire. 30 watt models 2.5 amp. One is a old siemens model about 15 years old and 37 watts, all together 97 watts. I plan on doing another video when there's snow on the ground.
wuberman: So far works great, but when there's no sun dosen't work at all. heat drops off quick. This one lets air travel up through the cans so it can pick up heat, There is no problem harvesting the heat if its sunny so I don't think having thermal mass would be useful as it would still cool off within a half hour.
mostvideosolar: LUVELY STUFF.. enjoy the free heat
NWforager: how long does it remain hot after the sun goes down? would sand filled cans stay warm longer due to thermal mass?
wuberman: Hi, I was unable to post a reply, all of the sudden it's all working now, so the best video to look at is from a guy called simple thoughts, right here on you tube. I did it for fun and to steal a few BTU's from the sun. Also do a google search for "pop can solar furnace".
wuberman: The plan was to take a few pic's while building it, but as luck would have it no battery's for the camera. It went together fast over two days, so no real detailed construction pic's. Added a oven probe type thermometer to the top right side later on. Will post a video after snow fly's.
wuberman: The outside temperature was about 25 degrees Celsius. It needs the fan running when facing the sun or the insulation gets to hot and expands. It holds at around 100 degrees with large air flow through it.
rasoros: what's the outside temperature when you made this video?