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Re: Black radiator cools better than silver
[Re: 383'D]
#621657
02/24/10 02:44 PM
02/24/10 02:44 PM
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Joined: Jan 2003
Posts: 4,877
Virginia
BSharp
master
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master
Joined: Jan 2003
Posts: 4,877
Virginia
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Here's an article from the Department of Energy. Sounds like radiators should be renamed "convectors". But the real question is, what if the airplane is white and the conveyor belt is black?
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Re: Black radiator cools better than silver
[Re: Mr.Yuck]
#621659
02/24/10 03:17 PM
02/24/10 03:17 PM
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Joined: Oct 2005
Posts: 8,861
Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,861
Ontario, Canada
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Quote:
Also consider that if black was so much better at cooling, NASCAR cars would have black radiators where even 5* would be a great benefit.
They run the grill taped up most of the time anyway so obviously cooling isn't an issue. Besides, as previously mentioned, the temp is controlled by the thermostat. It doesn't matter how much heat the rad dissipates, the thermostat will maintain its preset temp.
Everyone seems to be thinking along the lines of "running cooler". Not so. Operating temp is controlled by the thermostat. BUT, if you shut down the engine the car with the black rad would cool down faster.
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Re: Black radiator cools better than silver
[Re: Mr.Yuck]
#621661
02/24/10 04:22 PM
02/24/10 04:22 PM
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Joined: Jan 2003
Posts: 10,702
North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,702
North Dakota
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"Home > Library > Miscellaneous > Britannica Concise Encyclopedia
Thermal Radiation
Process by which energy is emitted by a warm surface. The energy is electromagnetic radiation and so travels at the speed of light and does not require a medium to carry it. Thermal radiation ranges in frequency from infrared rays through visible light to ultraviolet rays. The intensity and frequency distribution of the emitted rays are determined by the nature and temperature of the emitting surface; in general, the hotter the object, the shorter the wavelength. A hotter object is a better emitter than a cooler one, and a blackened surface is a better emitter than a silvered one. An example of thermal radiation is the heating of the Earth by the Sun.
For more information on thermal radiation, visit Britannica.com. "
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Black radiator cools better than silver
[Re: 6PakBee]
#621662
02/24/10 04:45 PM
02/24/10 04:45 PM
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Joined: Jan 2010
Posts: 329
Orange Park, FL
MRHWS
enthusiast
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enthusiast
Joined: Jan 2010
Posts: 329
Orange Park, FL
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I believe radiators were painted black to hide welded seams and metal discoloration and to match the rest of the underhood compartment.
1973 Charger SE
1974 Charger Rallye 440 Aztec
2008 Charger SRT8
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Re: Black radiator cools better than silver
[Re: 6PakBee]
#621663
02/24/10 05:34 PM
02/24/10 05:34 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
"Home > Library > Miscellaneous > Britannica Concise Encyclopedia
Thermal Radiation
Process by which energy is emitted by a warm surface. The energy is electromagnetic radiation and so travels at the speed of light and does not require a medium to carry it. Thermal radiation ranges in frequency from infrared rays through visible light to ultraviolet rays. The intensity and frequency distribution of the emitted rays are determined by the nature and temperature of the emitting surface; in general, the hotter the object, the shorter the wavelength. A hotter object is a better emitter than a cooler one, and a blackened surface is a better emitter than a silvered one. An example of thermal radiation is the heating of the Earth by the Sun.
For more information on thermal radiation, visit Britannica.com. "
great in theory but does it apply to a cars raditor? will it be enough difference to notice? not likely.
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Re: Black radiator cools better than silver
[Re: Mr.Yuck]
#621664
02/24/10 08:43 PM
02/24/10 08:43 PM
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Joined: Dec 2003
Posts: 22,696
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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It was widely reported back in the day that "Grumpy" Jenkins painted his race engines white to contain heat that would then be converted to mechanical energy. I am of the paint is a better emitter, but think the question of how much insulation paint adds, is a valid one, and the comment on black lacquer is on target. An example that comes to mind is the enclosed glass bulb with a two side free spinning black sided/white sided flag. When lit by a light/heat source, the black side flag spins away from the energy source, indicating I believe it heats more, and gives up its heat faster, not sure if this is a valid example of anything, but hey this is moparts. 
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Black radiator cools better than silver
[Re: jcc]
#621665
02/24/10 08:54 PM
02/24/10 08:54 PM
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Joined: Mar 2005
Posts: 1,630
North Central Florida
eightlitermopar
top fuel
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top fuel
Joined: Mar 2005
Posts: 1,630
North Central Florida
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Honest question then...not being sarcastic From what I read here, a black metal roof will actually be better in the summer for cooling my house vs a white metal roof? Is this right? (based on the argument presented for radiating heat?) eightlitermopar  
Mopar or no car
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Re: Black radiator cools better than silver
[Re: eightlitermopar]
#621667
02/24/10 09:05 PM
02/24/10 09:05 PM
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Joined: Dec 2003
Posts: 22,696
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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Yes and no, But only in the shade, but your example would be based on whether a black shaded roof over an attic space is hotter or cooler then the cooled living space below the attic, which really makes little sense other then for arguments sake, but its also I think why nearly every piece of decent high powered audio equipment has the heat sinks for cooling black in color
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Black radiator cools better than silver
[Re: jcc]
#621668
02/24/10 11:44 PM
02/24/10 11:44 PM
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Joined: Oct 2005
Posts: 8,861
Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,861
Ontario, Canada
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Quote:
From what I read here, a black metal roof will actually be better in the summer for cooling my house vs a white metal roof? Is this right? (based on the argument presented for radiating heat?)
Yeah, and a black interior will keep your car cooler on a hot sunny day too !!!
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Re: Black radiator cools better than silver
[Re: dOc !]
#621670
02/25/10 03:11 AM
02/25/10 03:11 AM
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Joined: Jan 2003
Posts: 6,591
Canton, Ohio
Sport440
master
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master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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Quote:
Come on guyz ...common sense ...
ANY paint on a rad is going to PREVENT(and insulate) the best heat transfer from the rad to the outside air.
The reasons WHY they are painted(oEM) is to prevent or retard outside corrosion.
I know it goes against common sense. BUT- Just how does a positraction rearend work in a 67 Plymouth?? It just does!!  
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