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Posted by j on February 14, 2012, 8:47 pm
 
On 2/14/2012 2:23 PM, Jim Wilkins wrote:

I hadn't heard of the SunTuf UV2 before.

My rough understanding is that polycarbonate deteriorates under UV,
acrylic (plexiglass) does not.

http://en.wikipedia.org/wiki/Polycarbonate

UV resistance: fair

What an amazing thing Wikipedia is... that is hard to find info. I had
only heard it previously, anecdotaly.

  It seems the original idea behind the UV coating was to protect the
material itself, not what is behind it. How the Lowes' polycarbonate
does this, I do not know, but it does.

   Thanks for the link. I didn't know they suggest cutting with the
blade reversed...

   Jeff


Posted by j on February 14, 2012, 6:44 pm
 
On 2/14/2012 12:48 PM, Morris Dovey wrote:

Glad to see you working on something new and bold! Anything new on the
fluidyne?


It's forced air. I have a collection box 25' back from the collector
sucking air back (12" flex duct). A smaller delta-T would need a bigger
fan. When the sun drops the delta-T moves down to 5F or less.

   I suspect a leak because when I close the inlet to the collector I
still have an outlet flow. I may go around with a can of spray foam
insulation. Or wait for a still day and test it with some incense sticks.

I'll post up something tomorrow. I have too much on the plate today!

I haven't found a local source for twinwall. Does it have the UV shield?
I ran the Lowes version of SunTuf which is minus a UV shield and the
felt turned gray after a year or so. My understanding is that mylar can
deteriorate under UV. I moved the Lowes corrugated polycarbonate over to
the solar cabana and put in some 4 mil and 8 mil vinyl under. I suppose
I'll see what the sun does to that eventually...  So, I've got 1 mil
mylar, 2 mil mylar, 4 mil vinyl and 8 mil vinyl in the test bed. If
nothing else, I'll see what fails! I think the vinyl is UV transparent,
but I don't really know.

   Cheers,
Jeff


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