Painting Intercooler Black - Better heat dissipation?

[oldcorollas]

does it really? or is it old wives tale?
i thought a lot of heat came in thru the windows? although i haven7t owned a black car, my white cars have always ben very hot after coming back from the beach

the point is, that white aluminium oxide is 80% of the emissivity of a 100% efficient black body emitter.... and black paint is likely to be similar


maybe people can read this..
http://www.savenrg.com/efactorfacts.htm

Quick question:
Two identical cars are sitting in the sun in a parking lot for four hours in the summer. One car has a black bumper, the other, a chrome bumper. Which one is hotter?
Black? Makes sense, chrome reflects heat and black absorbs heat, everyone will agree on this.
Now, think about touching the chrome seat belt buckle in your car, the ignition switch, or leaving a toolbox open in the sun and trying to pick up a chrome tool. Want to change your answer?
Reality: The chrome bumper, tools and seat belt buckles are MUCH hotter (over time), than an identical surface painted black. Why?
Emissivity

Aluminum, polished .04
Aluminum, oxidized .78
Copper, polished .05
Copper, oxidized .78
Human skin .98

Wood .95
Glass .94
Paint, average of 16 colors .94
Brick, common red .93
Concrete .92
Plaster, rough coat .91

so it is better to make intercooler out of brick? or to paitn with any colour? or plaster coat it?
or make it out of glass?

now that makes no sense... and it doesn7t, because emissivity is not the main factor fro an intercooler...

now look at the emissivities on this link.. http://www.infrared-thermography.com/material-1.htm
3M's special "black velvet" paint is 1.0
light blue enamel paint is 0.96
white lacquer is 0.92
flat white paint 0.989
ICE is 0.98

and for the low ones
http://www.infrared-thermography.com/material.htm
polished copper and aluminium are 0.0something.. almost nothing

but if you put a thick coating of insulating paint, then you have improved the emissivity... but reduced the heat transfer.. make it less efficient.....

[Hiro]

Except that most black bumpers are plastic, not metal (which is what chrome is).

[celicapain]

Have done maths, pretty sure that i EPICALLY fooked it up, methinks i used a combo of Kj and BTU's in the same equation. my head hurts and want to go home. ill post later if i can find the motorvation to redo em. this thread is mega painfull. good night.

[oldcorollas]

Except that most black bumpers are plastic, not metal (which is what chrome is).

err.. maybe on these new fangled cars.... most new cars don't have any chrome either.. just chromed plastic...


meh, paint your intercooler with insulating black paint.. see if i care

[amichie]

As far as I recall emissivity equals absorptivity at thermal equilibrium in classical thermodynamics ( that is what I meant by a reciprocal process).

To add to the Quantum revolution at the beginning of the last century perhaps we can put forward a new Toymods theory of thermodynamics.

"Shiny bling things must be better"

[TA22RE]

It dose work and that’s why a lot of microchips, Diodes, Capacitors are a matt black.
The theory is that the black extracts the heat and radiates to the surface so it is exposed to air/water or any other cooling element.
But you cant just use any ordinary matt black paint

[oldcorollas]

heat doesn't radiate to the surface. heat conducts to the surface.
black doesn't attract heat. it may or may not absorb more infrared waves (it depends more on material), but does not attract more heat from conduction...

aluminium oxide (which will naturally occur on the surface of the aluminium) is still 80-90% as good as a perfect "black body". hard to see why adding a layer of insulating paint with maybe 1 or 2% higher emissivity than the aluminium oxide will help?

maybe paint is beter at transfering heat to the air/water by conduction/convection due to more surface area?