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Commercial vs. homemade hot water panels.?

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Posted by kent423 on December 5, 2006, 10:37 pm
 
Hi,
I've been lurking on this list for about  6 months and have learned
alot.  Im hoping to install an underground water tank heated with a
bank of Solar panels.
One of the many decisions i need to make is whether i should buy panels
or make them. Are there any thoughts about the best bang for the buck
commercial panels out there and if they are worth it compared to what i
might be able to make on my own.

Thoughts and links to sites on Homemade panels, tanks and plumbing
appreciated.

chris
Rhode Island


Posted by Steve Barker LT on December 6, 2006, 2:37 am
 
I've come to the conclusion after much reading also, to use commercial
absorber plates and make the collectors myself.

--
Steve Barker





Posted by Robert Scott on December 6, 2006, 3:31 pm
 Can anyone comment on the feasibility of an all-plastic hot water panel?  I
realize that the biggest danger is going to be melting in stagnatiion
temperatures.  But if I am willing to install multiple redundant passive air
vents that oepn even in the event of a power failure, can't that danger be
reduced to an acceptable risk level?  I know that all-plastic panels are used
for swimming pool heaters, but they are generally not glazed.  I want to know
about glazed collectors.



Robert Scott
Ypsilanti, Michigan

Posted by Morris Dovey on December 6, 2006, 4:43 pm
 Robert Scott (in 4576e127.10470421@news.provide.net) said:

| Can anyone comment on the feasibility of an all-plastic hot water
| panel?  I realize that the biggest danger is going to be melting in
| stagnatiion temperatures.  But if I am willing to install multiple
| redundant passive air vents that oepn even in the event of a power
| failure, can't that danger be reduced to an acceptable risk level?
| I know that all-plastic panels are used for swimming pool heaters,
| but they are generally not glazed.  I want to know about glazed
| collectors.

Robert...

I've only built one small hot water panel (an experimental unit); but
in full sun it produced 180F water in a convection-only configuration.
I think this might be just a bit too warm for most reasonably-priced
plastics.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto



Posted by Jeff on December 6, 2006, 6:55 pm
 Morris Dovey wrote:


   I'm  rather impressed. The problem with plastics is that are very
poor conductors of heat. With that said, I hear  the Israelis are making
all plastic collectors.

   Jeff


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