Re: Re: Re: Radiator Colors

Posted by Aussiblue on January 04, 2001 at 06:41:25 from (203.54.154.192):

In Reply to: Re: Re: Radiator Colors posted by big fred on September 01, 1999 at 10:54:17:

I thought you needed to paint them black with special paint too but I'm told in another forum by GTS Boy, an engineer: (see http://www.autospeed.com/cgi-bin/autospeedbb/thread.cgi?thread=Forum5/HTML/005224.html&ord=1758735) "Black is more efficient for radiating heat...but radiant heat transfer only becomes significant once teh temperature difference between two surfaces gets to about 400C. Before that the convective and conductive heat transfer is up to several orders of magnitude higher than the radiative. Radiant heat transfer rate increases with the (not the square, not the cube, but) the fourth power of temperature difference, which is why it can become significant so quickly at high temps, but is totally insignificant at low temps.

Consequently, it is better to have non-coated radiators, because
1) they operate at low temperature differences (like less than 100C), and
2) any paint on the surface is going to increase the thickness of the and hence it's resistance to heat transfer, that is UNLESS...

somehow the paint has a better heat transfer coefficient to moving air than the metal does, which it might do by having a different surface roughness or some other property that increases turbulence across it's surface. I'm sure there is some smart chemist out there who has come up with such a coating, but most paints won't have any such effect."

• : Painting radiators, air con condensors

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