Solar themal piping [RE-wrenches]

[Tom Simko]

on 6/18/02 10:23 AM, Lawrence  Elliott at larry at energyoutfitters.com wrote:

> I have a  large Thermomax install coming up and need info on a source of
> underground compatible piping.
> I need to pump about 8 gpm underground for about 60 feet. Is there a
> commercially available pipe system that is insulated or has someone
> fabricated a suitable substitute.
> Any references would be appreciated.
> Thanks
> Larry Elliott

 Larry,
 Stick with copper pipe. Make a sandwich out of 2" blueboard type foam
insulation, with a table saw cut V groove to center the pipe top and bottom,
so that the 2 pieces of foam are touching when the pipe is inside the V
grooved pieces, prepare the trench carefully, or better, get pea gravel or
sand and level out the bottom, install the insulated pipe run, then more
sand, then your dirt to grade. The sand can be eliminated if you have good
dirt, I have rocks with some dirt. If you have foam left over throw it in
the trench also, more can't hurt. My own thermal system pumps 75 foot
underground, about 3 GPM, and has worked well for over 20 years. Checking
the inlet and outlet temps (90 to 145 F) with the same test thermometer show
no difference in temps, go figure.
Tom Simko
Skyline Solar
Inkom, Idaho

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