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OK, but that article is wrong.
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Posted by Dean (more from Dean) on Sun, 24 Mar 2002 10:51:03 Share Post by Email
In Reply to: Radiator/intercooler painting, redux....., SteveW, Sat, 23 Mar 2002 23:44:03
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OK, you get points for remembering what the post that you cited stated, but the autospeed article is dead wrong and very misleading.

Yes what they say about painted VS polished is true. But so what.

The IC will not remain in a polished state, and perhaps only the end tanks were polished. They will become quite emissive with time, that cannot be helped. So in the end the IC will be about as IR emissive as one that was paintd.

For these temeratures white paint would work as well as black in increasing ths IR emisivity. Emisivity in the visable wavelengths is of no consequence for an IC.

If you paint it, you will increase the IC's heat exchange with the hot rad, so what good is that?

The article states that painting will increase the heat ecxchange with the air. That is a totally and absolutely false statement!

Air at these IR wavelengths is absolutely transparent. So there is zerp IR heat exchange. Remember that the IR heat exchange it optical. So the heat exchange is what the IC can see. It can see the bumnper, and the rad, and the road surface and perhaps the sky and the mountains ahead. So painted, weathered or polished, there is no IR heat exhange to the air flow!!!

And the amount of IR heat exchange at these temperatures is quite small compared to the forced convention heat exhange to the ambient air flow. So for all practical purposes, the IR contrbutions can be ignored.

Black paint would be great for a steath application where you did not want folks to notice a big IC. For climates where the roads are salted, I would prefer a coating to help resist corrosion.

posted by 209.172.208...

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