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Newbie questions on solar air heating

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Posted by Jeff Thies on October 24, 2005, 6:08 pm
 
   I'm in Atlanta and am interested in cheap home made solar.
Electricity is cheap here, natural gas including all charges, is not.

   First, is there a FAQ for this group?

   Here's what I'm thinking... (mounted on a "dog house" on the roof,
roughly 45 degrees). I've been wrong before... and I'm not expecting
answers to everything...

   It seems to me that passing air through a "perforated" collector is
preferable to passing it over or under it. The pressure drop across the
collector will minimize the need for any ducting to prevent hot/cold
spots and the heat transfer is greater. What should the collector be?
Multiple layers of black aluminum screen tied together? Garden Shade
cloth? I saw someone mention black felt (probably on or sandwiched in
screen)? Some kind of metal, with holes punched through it (the thicker
the metal the fewer and larger the holes)?

   What about the collector back, if the internal is cross and front to
back braced (16" to 24" spans) would 1" sheet insulation be sufficient?
Should this be foil covered with the foil facing back at the collector?

   Are there sources of inexpensive polycarbonate glazing, or should I
look at something else?

   Anything else I should know? What about phase change storeage (salt
or fat or something else)?

   I was thinking of *not* reheating the air (saving ducting going up)
but in using some pseudo transpirated collector to feed a glazed
collector to boost the temp. (It looks like winter mean temps are 46
degrees or so and we in the US have an effective pro global warming
policy. <URL: http://climvis.ncdc.noaa.gov/cgi-bin/cag3/hr-display3.pl  
 >) Is that a good idea (the outside air, not the policy)? Humidty
problems on rainy days? What about desicant in collectors?

   Is anyone doing closed loop air flowing through car
radiators/condensors and then pumping the fluid?

   Cheers,
Jeff



Posted by Bill Kreamer on October 25, 2005, 8:19 pm
 
It's not necessary to sandwich a felt absorber between screen. You can email
me (kreamer@adelphia.net) for a PDF file of plans using my suggested
collector construction.
All the interior surfaces of the collector should be reflective except the
absorber.
When heating homes, one uses a recirculating system. The "transpired" type
that pre-heat outside air are for situations (mainly industrial) that
already use large quantities of fresh-air ventilation.
- Bill



Posted by Gary on October 26, 2005, 1:47 am
 Hi Jeff,

You might take a look here for some ideas on collector construction:

http://www.builditsolar.com/Projects/SpaceHeating/Space_Heating.htm

Gary


Jeff Thies wrote:

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









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