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Old 12-27-2011, 10:06 PM   #16
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Anyone doing any solar projects?


I've been working on a few ideas; ABS coils heating propylene glycol, filling reservoir and radiating through baseboard style radiators. Runs on thermo-syphon. So far, small scale tests are really encouraging, gonna step it up full scale next week!! Keep ya posted...

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Old 12-30-2011, 01:10 PM   #17
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Anyone doing any solar projects?


I've been thinking of playing with solar heat as well. It may not be electricity, but heat is one of the major energy uses in a house whether it's natural gas or electricity, so if I could get that part for free, it could make a pretty big difference on the gas bill.

Is ABS sensitive to the sun like PVC is though? I'm thinking the easiest way would be to just make a zig zag with ABS pipe and then pump liquid through it slowly. Have that inside a small cabinet with a double pane window pointing to the sun.
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Old 12-30-2011, 01:29 PM   #18
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Anyone doing any solar projects?


I made such a box: I got 65' of 1/2" black abs pipe in a box measuring 3'x2'. I lined it with a couple of black asphalt shingles and hooked up a pressure fit copper coupler to each end as in/output.

Just pumping through about 5 litters of water, I was really surprised to see the water temp climb to 163•F in just over an hour. I'm going to hook this up to water/radiant baseboard heaters on my 'full-scale' final project.

The wall thickness of the pipe determines how easily the water heats up; generally, from what I've read, the PVC straight pipe is too thick to do the job very well. I saw an amazing unit where a guy used an oldschool satellite dish with 200' of 1" abs pipe on it, it literally boiled the water in the reservoir!

When I get my unit running I'll post a pic.
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Old 12-30-2011, 04:29 PM   #19
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Anyone doing any solar projects?


Wow they make ABS pipe that small? Think the smallest I've seen is about 3 inches. I definitely want to try something like this out. Would be pretty nice to have free heat.

To be able to actually boil the water would be even more fun, but then you probably need iron pipe, which means more tools needed too.
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Old 12-30-2011, 04:49 PM   #20
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Anyone doing any solar projects?


Maybe I've got my ABS/PVC mixed up? Pipe has ABS on it, but it came in a roll if 100'. Dunno, I just bought what looked like it'd work...
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Old 12-31-2011, 12:08 AM   #21
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Anyone doing any solar projects?


Oh maybe pex? I think that is very sensitive to sun though... not sure exactly what happens, but I know it's a clear instruction to not have it exposed to the sun. Though, wonder if paint protects it, you'd want to paint it black anyway.
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Old 12-31-2011, 09:39 AM   #22
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Only pex I've seen is white; this is black.

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