Wall mount hot air collectors [RE-wrenches]

[Matt Tritt]

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  There WAS a pretty interesting solar wall a couple doors up the road until 
recently that worked like this:
  Picture a seperate structure approx 20' on the South side X 12' E X W. The 
South wall was clear fiberglass on the exterior built at about a 60 degree 
angle full height - about 14' top to bottom. The entire interior of the 
resulting room was dark brown with an open ceiling and insulation on all 
walls but South.

  The top and bottom of this structure were connected to the house proper 
via large duct pipes (about 3' diameter) with a slow speed fan installed in 
the bottom return duct. The heat-collecting building also had large openable 
glazing, which allowed the structure to act in cooling mode in the summer.

  The Gyro Gearloose former owner (a really cool guy) reported that he had 
to run his furnace about one week of the Winter in this temperate (minimum 
average lows in the high teens) clime. Pretty good performance I'd say, but 
also pretty ugly architecturally speaking. (:>I

  Matt T
  ----- Original Message ----- 
  From: "Kurt Nelson" <sunwise at cheqnet.net>
  To: <RE-wrenches at topica.com>
  Sent: Monday, November 15, 2004 12:46 PM
  Subject: RE: Wall mount hot air collectors [RE-wrenches]




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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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