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Solar Air Collector - S run of heatign duct as collector?? - Page 2

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Posted by David L. Jones on October 6, 2005, 9:52 pm
schooner wrote:

Yes, it's about that, could have been anything though as my aluminium
collector is mounted in a wooden frame, so the height of the wooden
frame sets the spacing.

I simply made my own "channels" by sandwiching 1" al tubing between
flat top and bottom sheets of thin aluminium. The tubing makes the
walls and the internal channels. Simply pop rivot togther and seal with

Some prototype pics here:

Dave :)

Posted by schooner on October 6, 2005, 9:59 pm
Is there any advantage to having the glazing air curved out from the
absorber to help collect more light? Or is it just as good to be flat and
even air space?

Posted by David L. Jones on October 6, 2005, 11:16 pm
 schooner wrote:

The curvature of the polycarb glazing will have no effect on how the
radiation is absorbed by the plate.
Some designs I've seen have angled collector "fins", supposedly to be
better angled toward the sun (on shallower roofs) and hence collect
more radiation. Doesn't work though, it's only the total perpendicular
pojected surface area of the absorber plate towards the sun that

Dave :)

Posted by schooner on October 6, 2005, 11:18 pm
 That is what I thought.  The Cansolair has a curved front they claim
improves heating but I was pretty sure this was mostly marketing BS.  In the
end it is the amount of sun hitting directly on the absorber that matters.

Posted by Brian Graham on October 7, 2005, 6:34 pm
 That's interesting. But I would have thought it more efficient to heat water
than heating air. Or is this just expediancy so you don't have to use heat
exchanger's, tanks etc. to dump the heat back into the house?

I'm also presuming you have some kind of shutoffs to prevent heated air going
through your unit overnight thereby cooling the house..

Some prototype pics here:

Dave :)

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