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".
jeevespreston: Hi, any update on adding sand or water, etc. to the can solar air
collector? Any efficiency difference? Thanks!
Frosttty: I don't like the idea of blowing air I'd breathe over hot painted objects.
RikterZilla: 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.
vlevesque2000: Great Job, tell us which sites you whent to.
wuberman: If I were to do this over again, the foam insulation would be gone. Use
something more temperature stable.
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?
Bradley Jeremy L.: Solar panels are the future everyone knows that here you can find more
mystykit: Thanks for posting this, it's the end result of many things I've searched
on youtube and other sites and very easy to figure out now that I see one
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.
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
NWforager: how long does it remain hot after the sun goes down? would sand filled cans
stay warm longer due to thermal mass?
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?
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
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.
m3141592: Nice work.
mostvideosolar: LUVELY STUFF.. enjoy the free heat
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.
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
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!
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 .