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grabbing heat from blinds

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Posted by carlbernardi@gmail.com on October 13, 2007, 8:03 pm
 
Hi,

I noticed that when the sun shines on my blinds they become very hot.
I was wondering if there is a way that I can blow air past my blinds
and in which direction to try heat a room?


Thanks,

Carl


Posted by Morris Dovey on October 13, 2007, 11:52 pm
 
carlbernardi@gmail.com wrote:
| Hi,
|
| I noticed that when the sun shines on my blinds they become very
| hot. I was wondering if there is a way that I can blow air past my
| blinds and in which direction to try heat a room?

Carl...

No need. Raise the blinds slightly and set the inside edge of the
blind slats higher than the outside edge and natural convection will
do the job for you.

For even better heating, turn all the slats upside-down.

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



Posted by gary on October 16, 2007, 1:06 am
 wrote:

Here is a pretty simple heat scheme for converting blinds into a
pretty good  solar collector.  It uses passive thermosyphon flow, so
no need for blowers.
It includes passive backdraft dampers to prevent high heat loss at
night.

http://www.builditsolar.com/Experimental/ColShade/colshade.htm

The measured performance turns out to be pretty respectable.

You can do better than this blind arrangement by simply opening the
blind when the sun is shinning on the window, and closing the blind
when the sun is not shinning on the window.  But, you have to be
around to do it, and it has to be a window you don't mind having an
open view through.

I've since replaced this blind arrangement with a triplewall
polycarbonate glazing panel that acts as inside storm window.  This
offers solar gain on sunny days, and also provides good insulating
value at night (about R5 total).  It also provides good lighting and
and a very diffuse view in and out.  I'm not sure how the performance
compares between the two.
Triplewall:
http://www.builditsolar.com/Projects/Conservation/PCWindowCvr/PCStormWindow.htm




Gary



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