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Passive Air-Heating Solar Panel Design - Page 2

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Posted by Morris Dovey on October 13, 2006, 12:04 pm
 
schooner (in B2NTg.45133$bf5.29762@edtnps90) said:

| What does it typically put out at high noon on a clear day?  You
| must have some general idea I would assume.  How do you test your
| panels to know their general performance?  What sort of difference
| are you getting from inlet to outlet?  Typical airflow on outlet?

I looked at the shop panel thermometers right after lunch yesterday.
The intake temperature was 54F and the discharge temperature was 156F.
It was partly cloudy and fairly breezy in central Iowa. I had no time
to do flow measurements.

Airflow measurements for passive panels (for mine, at least) have been
a PIA. I bought one of the heated-wire testers; and with continually
varying (sometimes abruptly large variances) readings the measurement
process remains essentially one of statistical sampling with a lot of
post-measurement analysis. I suspect that the measurement process is
simplified with forced air panels with their constant airflow - but
ease-of-measurement isn't one of my design criteria; and operation
without an external electrical power source _is_

The shop panel is now several development generations old; and each
design generation has resulted in significant improvements. I've
tested new panel designs by setting them up side by side with the
previous generation in order to get meaningful performance
comparisons.

FWIW, the primitive solar heating lash-up that consistantly
over-heated my shop in southern Minnesota would be woefully inadequate
for my current shop in central Iowa, just a hundred miles or so south.
The difference in normal weather patterns makes that much difference.
The Iowa location is significantly warmer; but the Minnesota location
had very much more clear skies. The lesson to me is that performance
claims for one area become (at best) questionable outside of that
area.

If you'd like to do a side-by-side comparison - or even just visit and
look around - you (and anyone else) are invited to schedule a time and
do so...

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



Posted by schooner on October 13, 2006, 12:41 pm
 
Ok thanks anyway.  Was just curious what sort of performance you were
getting.



Posted by Morris Dovey on October 13, 2006, 12:52 pm
 schooner (in TPLXg.12013$P7.2475@edtnps90) said:

| Ok thanks anyway.  Was just curious what sort of performance you
| were getting.

I know - that's why I offer opportunity to satisfy your curiosity <g>

Please keep in mind that the invitation is an open one. If you're in
the area, you're welcome to stop in, look around, ask questions, have
a cup of hot coffee, and learn and/or teach.

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



Posted by jfroche on October 12, 2006, 6:33 pm
 
Morris Dovey wrote:

A question, if I may?  Are the designs being put on the website so that
others can replicate them or as a sales tool to encourage buyers?  My
opinion is that there is not enough construction detail for the former
and too too much construction detail for the latter.

My two cents worth.


Posted by schooner on October 12, 2006, 7:09 pm
 
I'd be interested to see some performance numbers as well for these panels.



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