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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Oil Coolers

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Nusbaum Farms

02-21-2007 05:33:20




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I've got the oil coolers removed from my 1755. The ones mounted in front of the radiator. They appear to have been painted flat black at one time but most of the paint has come off. My question is what is the best color to paint them to provide the best cooling. Flat black like the radiator or should I remove the remaining paint and leave them aluminum color? I'm not trying to make a fashion statement or retain original color schemes, just want the best cooling possible.
Thanks

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J Schwiebert

02-21-2007 08:03:30




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 Re: Oil Coolers in reply to Nusbaum Farms, 02-21-2007 05:33:20  
They were all aluminum color as in no paint when new. Remember science in school, dark colors absorb heat light colors reflect heat. My tractor, I would take the paint off.



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Kruse

02-21-2007 17:34:04




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 Re: Oil Coolers in reply to J Schwiebert, 02-21-2007 08:03:30  

Mr. Schwiebert, ordinarily I would never pick an argument with you. But I will on this one. Here goes: Not only is the color black the best heat absorber (when it comes to absorbing heat from LIGHT), it is also the best heat radiator when it comes to convection. The is one of the reasons radiators were originally painted black. The color black is the best color for heat radiation compared to other colors.
Now before everybody picks a fight with me, go back and check your school science and chemistry courses. Double check your facts please.....
Btw John, I will never pick an argument with you when it comes to Olivers. ;-)

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RAB

02-21-2007 23:08:47




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 Re: Oil Coolers in reply to Kruse, 02-21-2007 17:34:04  
OK, forget the black body radiation etc. Most of the heat is not radiated, but conducted to the moving air stream. Just like an externally water-cooled heat exchanger, except that air needs to be moving faster as it is a pretty good insulator and has a low specific heat capacity compared to the same volume of water. In these conditions, bare metal is the better medium than putting a less-conductive layer of paint on it.
These radiators should really be called heat exchangers - but the old terminology has never been changed and we are stuck with a noun which dos not truthfully describe the object.
Regards, RAB

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AB

02-21-2007 20:50:17




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 Re: Oil Coolers in reply to Kruse, 02-21-2007 17:34:04  
Coolers,condensors, & heat exchangers are a little differently engineered than forced air radiators. We have some huge ones at the world's largest polycarbonate chemical plant I work at. None are painted. Every other structure, vessel, pipe, etc. of different service and spec's are color coded to meet OSHA spec. The majority are outside in the weather.

If it wasn't painted originally, I wouldn't paint it.

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J Schwiebert

02-21-2007 17:41:28




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 Re: Oil Coolers in reply to Kruse, 02-21-2007 17:34:04  
I am not going to tell you how many years it has been since I was in a high school science class. I know the coolers were not painted and I always though they disapated heat better that way. Guess I better borrow a science book next time I sub which will be this week weather permitting. J.



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