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Powder Coating: Thermal Performance

post #1 of 17
Thread Starter 
Apologies if this has been asked before, but I'm curious:

In the same way that many house owners will paint their radiators matte black to increase the heat output, does this work for cases which are powder coated matte black on the inside? Does the powder coating help the case to absorb and channel away the heat from the inside of the case?

Or is it really only for aesthetics?
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post #2 of 17
Sub, i also want to know.
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post #3 of 17
Any effect like that would minuscule. Proper air flow in a case has a far greater impact on case temps.
post #4 of 17
Painting a surface black increases the emissivity, a radiative heat transfer coefficient. Convection doesn't depend on color, which is what (I'm assuming) the bulk of the heat transfer throughout a case ends up being.

Besides, the radiation emanating from the inside of a case radiates to the inside of a case.
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post #5 of 17
Paint acts as an insulator of heat, not a conductor. Youre confusing radiation albedo with heat conductivity.

Its just one of those things people do because they dont understand and are making a false connection.
They know that flat black paint will get hot in the sun because it absorbs the infrared radiation of the sun. A CPU or a radiator is not putting off any long wave infrared radiation
Edited by Full_Tilt - 4/22/11 at 10:33am
post #6 of 17
Quote:
Originally Posted by Full_Tilt View Post
Paint acts as an insulator of heat, not a conductor. Youre confusing radiation albedo with heat conductivity.

Paining a radiator or a case or anything will only act to insulate it.
Its just one of those things people do because they dont understand and are making a false connection.
They know that flat black paint will get hot in the sun because it absorbs the infrared radiation of the sun. A CPU or a radiator is not putting off any long wave infrared radiation
It acts as an insulator conductively and convectively, but not radiatively. Technically.
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post #7 of 17
Thread Starter 
So basically you're saying, "the black on the inside of the case WILL NOT attract the heat and draw it into the metal to radiate it to the outside - not to any great degree. Powder coating the inside of your case is really only for aesthetics..."?

Would that be right?
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post #8 of 17
Quote:
Originally Posted by parityboy View Post
So basically you're saying, "the black on the inside of the case WILL NOT attract the heat and draw it into the metal to radiate it to the outside - not to any great degree. Powder coating the inside of your case is really only for aesthetics..."?

Would that be right?
that would be correct.
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post #9 of 17
Pretty much.
Actually, with as thick as powder coating can be it could actually act as an insulator since its less conductive than the aluminum or steel a case is normally made of.
Of course this would be much worse with a plastic case and I doubt that youd really see a temperature difference inside a plastic case compared to a metal case... so yah, It wont effect anything in any way.

Its just aesthetics.
post #10 of 17
Quote:
Originally Posted by parityboy View Post
So basically you're saying, "the black on the inside of the case WILL NOT attract the heat and draw it into the metal to radiate it to the outside - not to any great degree. Powder coating the inside of your case is really only for aesthetics..."?

Would that be right?
The black in a case will not conduct the radiant heat from the objects inside.
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