Solar Arrays. [RE-wrenches]

[Darryl Thayer]

HI all
All paints are black in the infared.  A white paint
has the same infared emmitance as black paint.  There
is an advantage in white because it reflects visible
and reducing the solar heating.  White can be as
reflective as metals in the visible and 10 times as
emmisive in the infared.
Darryl
--- sunwise <sunwise at cheqnet.net> wrote:
> 
> 
> -----Original Message-----
> From: Carl Emerson, 
> 
> I am interested to know if there is thought to be
> any advantage in 
> painting the back of solar modules black.  My idea
> is to lower the panel
> temperature by increasing the radiant heat and
> lowering the cell
> temperatures.
> 
> Hey Carl,
> 
> I'm no expert in the laws of thermodynamics, but I'd
> say that you would
> indeed increase radiant heat losses to the module at
> some time periods
> (especially early evening/nite when modules are warm
> and there is no
> daytime incidental solar radiant energy bouncing
> about), but that it may
> be a heat gain during high solar periods
> (reflective/incidental gain),
> but probably either way would not greatly impact
> cell temp.
> 
> Kurt Nelson
> 
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