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Window and solar collector

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Posted by Wayne Langille on October 8, 2005, 11:30 am
How much better is a solar collector than a south facing window of equal
size, do you get more heat in house from collector.   Wayne

Posted by Bert Menkveld on October 8, 2005, 12:05 pm

You won't get more heat into your house with a solar collector.  However,
you also won't be losing heat through the collector at night or when it's
cloudy.  That is what makes a solar collector better than a window.

Bert Menkveld

Posted by KDV on October 9, 2005, 2:34 pm

"Bert Menkveld" <bertATreentronicsDOTcom> schreef in bericht

I think that you get more heat with a solar collector then with a window of
the same area.
In the solar collector the hole area is black painted and take max heat of
the sun, the area behind the window it is not compleet black so all what is
not really black wil take less heat or even reflect the heat.
Correct me if  I' m wrong.
Kris De Voecht
Homepage: www.devoecht.com

Posted by Solar Flare on October 9, 2005, 3:43 pm
 Have both. If you sacrifice a window for heat collection you sacrifice the heat
gained from it also.

Posted by Gary on October 9, 2005, 5:57 pm
 KDV wrote:

My take would be that the window is just as good a collector.  Sun
shines through the window, and hits something in the room.  The
something may not be as absorbent as a black absorber, but most of the
light that gets reflected off the first something just hits something
else in the room -- eventually most of the light gets absorbed in the
room.  The exception would be the small amount that reflects back out
the window.  I would guess that this might be more than made up for by
the lower conduction/convection losses out the window vs the collector
glazing -- its hotter inside the collector than inside the room and
the glazing losses will be higher.

I think, as Bert said, the big difference is in the night losses out
the window.  You can fix this with insulated shades of some type that
go up at night.  Another factor might be that if you want the heat to
go to another place in the building, the collector allows this to be
done more easily.  But, the light coming trough the window can be nice



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