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Posted by Jeff on January 23, 2009, 4:44 am
    I'm redoing my solar wall collector.

  I've got the Lowes "equivalent" to Sun Tuf, they call it TufTex. It's
polycarbonate and UV resistant. I don't know if it is UV blocking, but I
suspect so.

   So, I'm thinking of an inner glazing of mylar. I think the big
disadvantage in mylar is that deteriorates in UV. Any opinions on this
and does any know of a US source (8' wide would be good)? It's harder to
find than I would have thought.


Posted by frank on January 23, 2009, 7:24 am
Jeff wrote:


I have used mylar on a small test solar trough, but only had it out one
season so not sure how long it lasts, I suppose it makes a big
difference as to what side the metal coating is on right?

I was told by someone that it doesn't make any difference what side you
use, I would think that the side with the metal coating on the facing
out would reflect more of the UV  and last longer.

    Would you know the life expectancy of mylar, exposed to UV?

Posted by Jeff on January 23, 2009, 8:04 am
 frank wrote:


   I was thinking of clear  mylar. I believe the colored and mirrored
stuff gains UVs resistance because of that.  Mylar has fabulous
properties as far as heat and water vapor tolerance and would probably
make a great inner layer on a Thomason type trickle collector.

   How did your trough work out?


Posted by frank on January 23, 2009, 5:59 pm
 Jeff wrote:

    I just wanted to to see how  a solar trough works and how much heat
could be concentrated in a lo cost built trough collector before
building something bigger,  this was just a 2 foot x 4 foot unit built
with plywood frame covered with tempered  masonite and the reflective
mylar. got some wood smoking at the focal point, so I was impressed.
have to do the math and work out some figures and materials and build a
larger unit this summer ( CANADA )

At this point I have just been building different types of small
collectors to test and take it from there,

    Have enjoyed the group and found it very helpful and informative,
someone mentioned something about not reinventing the wheel, that's
right, it just takes a bit of help sometimes to get it the wheel rolling.

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