Wall mount hot air collectors [RE-wrenches]

[Kurt Nelson]

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-----Original Message-----
From: Dean T. Newberry [mailto:deant at dcn.org] 

 Today I think we would use a regular 
building frame cavity with insulated low-e glass for glazing and drywall

painted black for the absorber, leave enough space between both for 
sufficient air movement. 

I think most manufactured collectors circulate the air behind the
collector surface rather than in front of it where there can be higher
heat losses out the glass.  Drywall would not make a very good collector
surface in such a case but an added benefit is that low-E wouldn't be
required or even helpful.

Also, getting the baffling right is a challenge.  The air flow needs to
"wash" the entire collector surface, not just flow through the center
with hot spots in the corners.  

I built such a system into an awning over south windows and know that
there can be very real concerns about stagnation temperatures during the
summer months.  Pyralasys (spelling?) is a process where in the flash
point of a given material lowers considerably with prolonged exposure to
the types of temps we're talking about, so I think your idea of shading
the summer sun is a very good one.

Solar Mining Company is now producing a hot air collector in addition to
their innovative flat-plate collector for fluid systems (large
collectors come on truck, set w/crane).  An interesting feature of their
hot water systems (which go on small commercial projects like car
washes) is that they don't sell it to you, you just pay for the BTUs
delivered like they were a utility company.

For the fluid panels
http://www.solarminingco.com/prod03.htm

For wall mounted solar air heating panels
http://www.solarminingco.com/prod02.htm

Good luck -- Kurt Nelson

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