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re: pv cell temperature
28 jan 2001
r. h. allen wrote:
>...after i sent my previous post i started thinking about what i said --
>that browning is due primarily to uv -- so i did a bit of digging
>around to try to confirm that statement. it turns out i was wrong;
>heat is the true culprit. i apologize for the error.
>i only skimmed the articles, but the simplified explanation is that
>heat leads to the formation of acetic acid within the encapsulant, and
>the acid catalyzes the browning reaction. i also found it interesting
>that the browning is most intense over the centers of the cells, where
>temperatures are highest.
rich komp seems to agree with you...
to: nick@ece.vill.edu
date: sun, 28 jan 2001 09:25:39 -0500
subject: re: 2 or 3 suns on eva panels?
from: richard j komp
dear nick,
i've enjoyed your exchanges with the people who are rediscovering
concentrator systems. i remember a fellow 20 years ago who actually
built water tanks out of the backs of a couple of arco solar power
modules by simply sealing the backs with sheets of aluminum and had hoses
running water in and out. he used car heater hoses and had the system
with reflectors on a homemade two axis tracker. so it's coming around
again. i am almost sure it's the heat not the uv that turns eva brown,
as i haven't seen any appreciable browning on the modules at my place in
maine (which gets more than its share of uv now that the ozone hole is
bigger), but have seen quite a bit of browing on modules down here in
nicaragua.
rich
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