Richards Design Suggestions
An interesting idea.
I assume you are planning on using solar energy to supplement your heat.
note from your tests so far that the back of the board gets warm -
Excellent! This gives you another surface from which to get heat. And
if this were the case, then why not maximize it with a metal
'absorber'. Also, since heated air rises, why not make use of
end your air path at the top. Given these suggestions, how about
something like this;
Where the blobby
stuff is insulation and the zig-zag is a sheet of corrugated metal,
painted flat black.
idea is that air enters at the top right side, behind the metal and is
drawn down (pre-heating as it goes) and under the bottom of the metal
by the convection on the front side of the panel. The flow can be
assisted by a blower if desired. The heated air would exit at the top
left, in front of the metal The back of the box would be painted shiny
silver (or foiled) to keep more heat in the metal for the in-coming air
to pick up.
The glass on the
front could have a 'Low-E' coating
to prevent some of the radiant energy from escaping out the front of
the panel. This option adds cost, of course.
A flat piece of
metal would work also, but I opted for corrugated to increase surface
area. Also, it might 'channel' the air better, but I'm not sure if that
is a moot point.
Any way, that is my
two cents worth. I might find some more change around it I give it more
Sorry for the
cryptic images, but MS Paint didn't seem to have an obvious 'Dashed'
line to show hidden lines.
I'm not trying to take over your design (I get accused of that), but
you started me thinking about it so I thought I'd throw out some ideas.
Please feel free to throw them out yourself if they are not useful.