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Posted by Gary on September 15, 2005, 5:29 pm
nicksanspam@ece.villanova.edu wrote:
>
>
>>...does a Poly-Isocyanurate persist two decades of the temperatures
>>that the collectors have? The max temperature of that insulation
>>material is about 300 deg F (150 deg C) - pretty near to the stagnation
>>temperature, or even below it for good collectors.
>
>
> When Gary sent me the nice solar pond water heater model he tested in
> Montana, I put it together in partial sun with the pump unpowered and
> had a meltdown :-) The 2" Styrofoam cover (under a layer of EPDM under
> 2 layers of polycarbonate) developed multiple 1" hills and 2" valleys.
Here are some additional (unintended) thermal sculptures.
http://www.builditsolar.com/Experimental/pinkfoam.htm
>
> A 2" double-foil polyiso replacement with foil-taped edges has worked
> fine so far. One polyiso ap engineer says it's good to at least 350 F,
> when the surface starts to develop cosmetic wrinkles. But I think we
> should replace both polycarbonate layers with greenhouse polyethylene
> to lower the cost and assembly complexity and stagnation temperature.
I like polycarbonate on the outside layer for weathering, durability,
impact resistance, AND the dog can't chew a hole through it to get to
a warm spot (like she did on my poly film sunspace) :-)
>
> I put some polyiso on top of a toaster oven, and it deformed badly...
>
> Nick
>
> Don't miss this opportunity to have every solar question you ever asked
> answered in three different ways...
>
> Join PE Drew Gillett and PhD Rich Komp and me for a workshop on Solar House
> Heating and Natural Cooling Strategies at the first Pennsylvania Renewable
> Energy Festival at 9 AM on Saturday September 24, 2005 near Allentown. See
>
> http://www.paenergyfest.com/workshop-info.shtml
>
--
Gary
www.BuildItSolar.com
gary@BuildItSolar.com
"Build It Yourself" Solar Projects
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