>> Black bodies radiate and absorb heat many times
>> more efficiently than a white or shiny body.
>
> I have heard it said that this is largely true at extreme
> temperatures. Might be nice to have someone dissipate a
> "real world" amount of power (say 100 watts) in a heat
> sink of raw aluminum and do it again with an identical
> sink that is black. I have a hunch that the heatsinks
> will
> have similar temperatures
That might be true. Very often the largest portion of
cooling is through contact with moving air.
This is the same as several others have said, but it might
be useful to repeat it anyway in different words....
The only advantage to a dark color is when the heatsink is
surrounded by cooler objects and a substantial portion of
cooling is through infrared radiation and not through
cooling by contact with a moving airstream.
If we force air cool or convection cool a heatsink that has
a "view" of hotter surfaces, things are generally better
with a clear surface.
73 Tom
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