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Posted by Cosmopolite on September 8, 2003, 1:40 am
 
I don't understand the use of all this copper in flat plate
collectors.
Why can't you use a sheet of Coroplast with a plastic
pipe manifold on the bottom and top, a sheet of
styrofoam on the back and some glazing over it to
make a reasonable priced collector. ( details left
to your imagination )
If you go to www.segerfrojd.se/ppvsmetal.htm ,
you will see that polypropylene ( Coroplast ) is almost
as good at thermal transfer as steel or aluminium, but is a
lot cheaper and Coroplast comes in black, as well as
the other colours you see for garage sale signs.


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