Ever heard of black body radiation ?
If black objects were unable to radiate heat effectivly, then we would
be relying purely on convection and conduction to cool them down again.

As an experiment Wagner, get two heatsinks, paint one white, and the
other black. Place both in water and boil for a while. I have no doubts
that you will find the black one cools faster, also hold a safe distance
from your face, the black one will warm your face.

The problem with all this theory, is that we are not able to test most
of it with our own senses, if for example we were able to see in
wavelengths to +&- 10^2 of our current range, I can assure you that
there would be far fewer secrets in the world.
regards,
Graham Daniel.

Wagner Lipnharski wrote:
<cut>
> Some radiators are painted in black, because black is the color that
> doesn't reflect any color, or other visible radiation, it is very nice
> to absorb heat, but to transmit it?  I doubt that. I can be wrong, and I
> would like to see an explanation about its efficiency.

> The real problem with high density microchips is that it generates large
> heat in a very small spot, very difficult to remove that concentrated
> heat.  This is the main reason to reduce power consume, and drop supply
> voltage to 3V and so on. The heat is reduced.  Technically it is
> possible to produce smaller and smaller microchips, but the heat removal
> problem holds this possibility.
<cut>
This is ideal use for "Heat pumps"
use a tube with wick inside and thermally conductive attachment points
each end. fluid in wick evaporates at hot end, condenses at cold.



--
Steam engines may be out of fashion, but when you consider that an
internal combustion engine would require recovery of waste heat by
transfer just before top dead centre then fashion becomes rather
redundant, USE STRATIFIED HEAT EXCHANGERS ! and external combustion.

You heard it first from: Graham Daniel, managing director of Electronic
Product Enhancements.
Phone NZ 04 387 4347, Fax NZ 04 3874348, Cellular NZ 021 954 196.