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Connecting passive solar heat boxes?

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Posted by dpadavona on August 15, 2006, 9:01 pm
 
I have taken note that many of the commercial solar heat box producers
recommend adding to the heat production by linking multiple boxes
together.  For instance I think ClearDome suggests you can link 5 or 6
solar hot boxes together using insulated venting.

Last year I built a 6' x 3' box roughly based on Bill Kreamer's design
plans.  The box works nicely, captures heat, and brings it into my
house.  The obvious problem is you can only collect so much heat with
6' x 3' of glazing.  On the plus side, this size box makes the unit
quite mobile. I can pick it up and move it whenever I have to, and can
even get it out of the elements during the summer to save wear and
tear.

Can I build multiple boxes and link them together using insulated
venting?  How would I best implement this to reduce heat loss from the
boxes...Is one vent in the middle/side of each box practical for
connecting them together, or would I be better off having 2 vents for
each box connection - one near the top and one near the bottom to
generate a circulation?

Any advice is most welcome.  I want to start building soon since the
cooler days of Autumn are not far away.


Posted by John on August 16, 2006, 1:06 am
 
: I have taken note that many of the commercial solar heat box producers
: recommend adding to the heat production by linking multiple boxes
: together.  For instance I think ClearDome suggests you can link 5 or 6
: solar hot boxes together using insulated venting.
:
: Last year I built a 6' x 3' box roughly based on Bill Kreamer's design
: plans.  The box works nicely, captures heat, and brings it into my
: house.  The obvious problem is you can only collect so much heat with
: 6' x 3' of glazing.  On the plus side, this size box makes the unit
: quite mobile. I can pick it up and move it whenever I have to, and can
: even get it out of the elements during the summer to save wear and
: tear.
:
: Can I build multiple boxes and link them together using insulated
: venting?  How would I best implement this to reduce heat loss from the
: boxes...Is one vent in the middle/side of each box practical for
: connecting them together, or would I be better off having 2 vents for
: each box connection - one near the top and one near the bottom to
: generate a circulation?
:
: Any advice is most welcome.  I want to start building soon since the
: cooler days of Autumn are not far away.
:
How about running them like solar water panels? Mount them horizontal, one
over the other, and run the venting like this:
Lower panel - In bottom left and out upper right
Upper panel - In lower right and out to house, upper left.

I look forward to this thread as I will be starting mine soon as well.

John





Posted by Gary on August 16, 2006, 1:21 pm
 dpadavona@yahoo.com wrote:

These guys have a collector design that allows ganging together several panels.
http://www.sunsiaray.com/StartPage.htm

Here is a picture from there installation guide that shows how they do it.
http://www.sunsiaray.com/roof9.JPG

Judging by the pictures, they can gang them along the narrow or wide sides.

It looks like the inlet duct goes into the first panel, and the exit duct comes
out of the last panel.
How ever you do it, make sure that the air uniformly washes the full surface of
all the panels.  I would try to keep the total path length of the air at not
much more than 20 ft.

You might also find some helpful info here:
http://www.builditsolar.com/Projects/SpaceHeating/SolAirHtSysBook/SolAirHtingBk.htm

--


Gary

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









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