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Posted by sylvan butler on December 4, 2006, 11:05 pm
 

I don't think so!

If that logic were correct, you could glaze with a second piece of dark
aluminum and pass the same test!

You need to use a temperature probe to measure the collector temperature
and compare with several different types of glazing.  Preferably under
the exact same conditions of solar, air temp, wind, etc.

sdb

--
Wanted:  Omnibook 800 & accessories, cheap, working or not
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Posted by SJC on December 5, 2006, 12:11 am
 


  I used to use cooking thermometers that go from 0-240F. They are
available in any supermarket. Analog is about $ and digital $2.
I fasten the tip to the surface with tape and put the gauge outside
the box. You can watch the rise fairly accurately and should be able
to see how transmissive your glazing is and how good your insulation
is by the heating, max. and cooling times.


Posted by Gary on December 5, 2006, 3:43 am
 sylvan butler wrote:

The objective is to find parts of the absorber that are running hot from not
getting adequate airflow.

It seems to me that if the glazing is transparent to IR (like polyethylene) than
the IR scanner temperature gage will be able to read the temperature of the
underlying absorber surface through the glazing -- am I missing something?

Gary

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Posted by Morris Dovey on December 5, 2006, 3:58 am
 Gary (in 1165290306_1537@sp6iad.superfeed.net) said:

| It seems to me that if the glazing is transparent to IR (like
| polyethylene) than the IR scanner temperature gage will be able to
| read the temperature of the underlying absorber surface through the
| glazing -- am I missing something?

Only if IR(out) isn't equal to IR(in)

:-)

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



Posted by sylvan butler on December 6, 2006, 5:50 pm
 
than

That's the big "IF" right there.  And since you are changing the
glazing, and each glazing has a different IR conductance and reflectance
factors, trying to measure the temperature of the absorber thru the
glazing will be affected.  Without actual readings from the absorber you
cannot tell if you are measuring absorber or glazing temperature.  (Most
likely you will be measuring a combination of both, whose ratio changes
depending on the glazing under test.)

BTW, enjoyed your article in Mother Earth.  Congratulations on getting
published.  :)    I didn't see any figures on how hot the collector gets
stagnant in the summer...  I'd be concerned about the temperature of the
wood construction unless it were covered out vented w/outside air.

sdb

--
Wanted:  Omnibook 800 & accessories, cheap, working or not
sdbuse1 on mailhost bigfoot.com

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