Posted by email@example.com on October 28, 2005, 3:14 pm
I'm going to make a solar collector using PVC as the frame and want
some sort of low cost semi flexible plastic. Its going to have to be
moved so weight is a factor.
Posted by Ecnerwal on October 28, 2005, 4:26 pm
Polycarbonate has the best properties for a plastic glazing. Available
in several forms, some more flexible than others.
Cats, coffee, chocolate...vices to live by
Posted by Gary on October 28, 2005, 4:35 pm
As encerwall says, Polycarbnate is good for glazing. The specs say
its OK up to 270F, and people have used it successfully.
If you are building the frame from PVC, you will need to make sure the
frame is insulated from from the collector. The temperatures that
collectors reach at stagnation will permanently deform PVC (I have
some unintended PVC thermal sculptures to demonstrate this :-) ).
Lots more of info on building collectors here:
"Build It Yourself" Solar Projects
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Posted by nicksanspam on October 28, 2005, 5:53 pm
Even for solar ovens. The glazing might only be (270+100)/2 = 185 F max
on a 100 F still day, over a 270 F collector.