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temp glazing and cheap solar collector

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Posted by Jeff on November 17, 2006, 1:39 am
   After I finish my other projects...

   I have a south facing wall that gets some sun (some shade) in the
winter, it has two large jalousy(sp?) windows. Normally I cover these
windows for the winter.

   Here's what I'm thinking:

Cover most of this wall with some temporary glazing. Air could be pulled
out one window, with the cold air entering from the other. There's about
10' between windows.

Rough idea:
1) Add a solar absorber across (either black screen or shade cloth) the
entire area. The cold air inlet window would be framed out to the
absorber, so that the air inlet would be on the north side of the
absorber screen.

2) The return window would just be behind the screen. Probably a window
fan pulling air through.

  Since initially I'd like to take this down during the off season, some
temp glazing might be in order. What would that be? Polyethelene glazing
springs to mind, but isn't that IR transparent? Wouldn't IR opaque be
better. How about vinyl (like shower curtain liners)?

   Suggestions welcome (Nick, Gary, et all). Especially to tell me this
  idea is foolish and not to do it!


Posted by dold on November 17, 2006, 2:21 am

Solar Projects, Space Heating, "Very Inexpensive Solar Shop Heater".
as soon as you tell me how well it works, I'm going to do it, too.  ;-)

Clarence A Dold - Hidden Valley Lake, CA, USA  GPS: 38.8,-122.5

Posted by nicksanspam on November 17, 2006, 10:42 am

Warm air rises...

Black screen, if it will stagnate.

Maybe you mean south side? That's more efficient.

With a room temp thermostat in series with a collector thermostat, eg
$5 Grainger 2E158s wired in opposite senses.

I'd make it permanent and use GE Lexan 0.010 inch flat clear polycarbonate.


Posted by Jeff on November 17, 2006, 1:17 pm
 nicksanspam@ece.villanova.edu wrote:

   I thought the the losses would be less if the cool air was against
the glazing. The heat gain must be much greater with the cool air
against the glazing?

   If I do that I might cut holes in the wall to convert circulation to
top and bottom and go with something closer to Gary's Barn Collector.

   Do you have a good place to order the flat lexan? I found it rather
pricy compared to suntuf.


Posted by nicksanspam on November 17, 2006, 4:32 pm

They would. That's "the south side of the absorber screen."

Try GE at 800 451 3147. I just got a $29.60 quote for a 4'x100' roll
of HP92W 10 mil Lexan. Shipping is extra, about 30 pounds by UPS.


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