Solar Arrays. [RE-wrenches]

[Darryl Thayer]

Sorry but I have looked at black and white paint in a
Spectral Photometer, and in the infared black and
white are both black..  Except for a very few paints
that were created for spectrual charicteristics. And
most of them did not work very well.  

The white will reflect visible and emit infared, the
black will absorb visible and emit infared.  The white
will be cooler because it has less to emit.  
Daryl
 
--- "Carl Emerson, Free Power Ltd."
<freepower at freepower.co.nz> wrote:
> Hullo again...
> 
> Thanks for the responses to the question on the
> merits of painting the 
> panel backs black.
> 
> As Matt suggested it will have to be tried to prove
> the theory one way 
> or the other. The list is split on the issue.
> 
> I just remember at school more years ago than I care
> to remember,  a 
> physics experiment with a tin of hot water.  Two
> sides were painted 
> black and two white.  The black sides radiated far
> more heat.
> 
> The reason why the issue came up was that I designed
> a system for a 
> library here in Auckland and the architect
> stipulated that the back of 
> the array was to be black for aesthetic reasons.  It
> is an open array 
> with stacks of ventilation. I have pondered on the
> effect on performance.
> 
> Is there someone on the list that could easily prove
> this ??
> 
> Cheers
> 
> Carl E.
> 
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