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solar thermal payback? - Page 8

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Posted by darrylvan on September 27, 2006, 11:38 pm
schooner wrote:

Just to be clear i'm not knocking your design. It looks awesome. Just
out of my price range at this point. Especially while I'm experimenting...


Posted by Jeff on September 28, 2006, 7:11 am
darrylvan wrote:

On the cheap, which is where I'm heading... Prices USD, Consider this to
be bottom end figure for a flat plate collector with new materials.

2 * 10  3 or 4 tube water collector

1/3 sheet 1/2" AC plywood ~ $
1 sheet Suntuf glazing 2' * 10' ~ $2
2/3 sheet 1" polyiso foil foam board ~ $
3 or 4 1/2" hard copper 10' ~ $6-$8
2/5 roll of aluminum flashing ~ $
4' 1" copper header pipe ~$5

either flat black etch primer or solkote selective paint, Solkote ~$5
delivered, covers ~500 sq ft

add caulk, fittings (if needed), good quality house paint and
fasteners/strips (for Suntuf), can of urethane foam (to glue insulation

The bulk of the *collector* cost is in the copper.

   For the system add pumps, plumbing, controls, valves and storeage tank.

And stuff I've missed.... whatever that may be.


Posted by nicksanspam on September 28, 2006, 9:31 am

That makes a reflector over a shallow draindown pond over a layer of
EPDM rubber over a polyiso board unpressurized tank cover look good,
with a pressurized plastic pipe heat exchanger. And a low-power pump and
2 snap- disk thermostats, one to turn the pump on when the sun shines
and another to turn it off when the water near the pump hits 140 F.


Posted by Jeff on September 28, 2006, 2:06 pm
 nicksanspam@ece.villanova.edu wrote:

When you can get one to work on my slanted roof, I'm all for it. In the
meantime my heavily shaded city lot isn't collecting much sun! (Oddly
the south facing roof is not at shaded)

Seems like your idea would work well out where there is more open space.


Posted by Darrylv on September 28, 2006, 12:55 pm

2*10? Is there any resonable way to 'join' two sheets of suntuf?

I found the suntuf at homedespot last night and was hoping for 4'


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