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Solar air collector for cooling at night....

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Posted by schooner on March 12, 2006, 2:24 pm
 
Curious if anyone has tried using their solar air collector at night for
cooling during the summer, i.e. basically running the fan at night to pump
the warm inside air through the unit which would be cooler as it is outside
and dropping the temp of the circulated air.

Thought it might be worth trying as it would be circulating the same inside
air and thus wouldn't cause the dampness of leaving a basement window open,
i.e. recirculate and cool the dryer inside air.



Posted by Duane C. Johnson on March 12, 2006, 2:58 pm
 
Hi Schooner;


 > Curious if anyone has tried using their solar air
 > collector at night for cooling during the summer,
 > i.e. basically running the fan at night to pump the
 > warm inside air through the unit which would be
 > cooler as it is outside and dropping the temp of
 > the circulated air.

Yes, it does work. However, most solar collectors
have transparent covers designed specifically to prevent
heat loss through long wavelength infra red or
convection losses.

One method would be to open the covers.

Or open the ends, however this only looses heat
through convection.

 > Thought it might be worth trying as it would be
 > circulating the same inside air and thus wouldn't
 > cause the dampness of leaving a basement window
 > open, i.e. recirculate and cool the dryer inside air.

This only works if the air transfer medium is sealed
from the front of the open "radiator".

Duane

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Posted by schooner on March 12, 2006, 3:08 pm
 Thanks.  I guess its easy enough to test to see if the temp drop is worth
the effort.



Posted by Morris Dovey on March 12, 2006, 11:14 pm
 schooner (in VaWQf.19712$M52.6087@edtnps89) said:

| Curious if anyone has tried using their solar air collector at
| night for cooling during the summer, i.e. basically running the fan
| at night to pump the warm inside air through the unit which would
| be cooler as it is outside and dropping the temp of the circulated
| air.
|
| Thought it might be worth trying as it would be circulating the
| same inside air and thus wouldn't cause the dampness of leaving a
| basement window open, i.e. recirculate and cool the dryer inside
| air.

This won't work with the type I produce, even if you add a fan to
force air circulation at night. With a fan, the amount of heat you
could lose is negligable - and without a fan (normal configuration)
air circulation through the panel is near nil.

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



Posted by Gary on March 13, 2006, 9:37 pm
 schooner wrote:

Hi Schooner,

Thermosyphon collectors usually have a backdraft preventer that is specifically
intended to prevent reverse flow, which would cool the building.
Just from looking at the back draft preventer film at night on mine, you can see
that the air does want to circulate backwards -- the film gets sucked very flat
against the exit vent screen.

I'll have to give your thought a try when summer comes, and see what kind of
back flow volume and temperature it develops.  Seems like this could be a nice
feature for many climates where you get a lot of cool, clear nights.
For the thermosyphon case, this would call for a fancier backdraft damper that
opens at night and closes during the day.  Right now the damper is just 2 cents
worth of light plastic film.  Any ideas on how to do this?  a passive design
would be nice.






--


Gary

www.BuildItSolar.com
gary@BuildItSolar.com
"Build It Yourself" Solar Projects









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