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#1
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Black paint - hotter car?
How much hotter would a car painted back be compared to the same car
painted silver if you leave them outside on a sunny day? |
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#2
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"Johnny" > wrote in message
om... > How much hotter would a car painted back be compared to the same car > painted silver if you leave them outside on a sunny day? I would think that the size of the greenhouse area is what dictates any difference "inside the car". The sheetmetal on a black car might be hotter to the touch, but I doubt that this makes a big difference on the inside. -- I don't check the Email account attached to this message. Send instead to... RBrandt at Hunter dot com |
#3
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Rick Brandt wrote in alt.autos
> "Johnny" > wrote in message > om... >> How much hotter would a car painted back be compared to the same car >> painted silver if you leave them outside on a sunny day? > > I would think that the size of the greenhouse area is what dictates any > difference "inside the car". The sheetmetal on a black car might be > hotter to the touch, but I doubt that this makes a big difference on the > inside. Having owned many cars of many different colors, I will state that black cars are always hotter by several degrees than lighter cars. > > -- Dick #1349 "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." ~Benjamin Franklin Home Page: dickcr.iwarp.com email: |
#4
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#5
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Johnny wrote:
> How much hotter would a car painted [black] be compared to the same car > painted silver if you leave them outside on a sunny day? There is no way to answer this question without knowing all kinds of details about how each car is built (what materials, over how much area, and so forth) and how hot it was outside. But in general, the black car should absorb more heat and should stay hot longer. |
#6
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John David Galt > wrote in
: > Johnny wrote: >> How much hotter would a car painted [black] be compared to the same car >> painted silver if you leave them outside on a sunny day? > > There is no way to answer this question without knowing all kinds of > details about how each car is built (what materials, over how much area, > and so forth) and how hot it was outside. But in general, the black car > should absorb more heat and should stay hot longer. > > But black also radiates (loses) heat better,that's why electronic heat sinks for integrated circuits are black. -- Jim Yanik jyanik-at-kua.net |
#7
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Having used one of those portable black-tank camper showers, I do know they
get substantially hotter than a silver-tank unit. We also, for fun, did a reading with an electronic infrared thermometer of car finishes a few weeks ago. The lowest in the sun was white. Next was silver, then metallic blue, and finally black being the hottest. The surface temperatures ranged from 130 to 182 degrees (black car). My brothers blue metallic car is far to hot to grab the steering wheel whereas the white car wasn't too bad. Also, watch the delivery drivers of UPS and FedEx. The darker UPS truck's driver always seems more uncomfortable and sweating more than the FedEx drivers in the white trucks. B~ |
#8
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John David Galt wrote:
> > Johnny wrote: > > How much hotter would a car painted [black] be compared to the same car > > painted silver if you leave them outside on a sunny day? > > There is no way to answer this question without knowing all kinds of > details about how each car is built (what materials, over how much area, > and so forth) and how hot it was outside. But in general, the black car > should absorb more heat and should stay hot longer. Moreover, the difference between a silver and a white car is significant. -- Cheers, Bev =/=\=/=\=/=\=/=\=/=\=/=\=/=\=/=\=/=\=/=\=/=\=/=\=/=\=/=\=/=\= "Sure, everyone's in favor of saving Hitler's brain, but when you put it into the body of a great white shark, suddenly you're a madman." --Futurama |
#10
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"B. Peg" wrote: > > Having used one of those portable black-tank camper showers, I do know they > get substantially hotter than a silver-tank unit. > > We also, for fun, did a reading with an electronic infrared thermometer of > car finishes a few weeks ago. The lowest in the sun was white. Next was > silver, then metallic blue, and finally black being the hottest. The > surface temperatures ranged from 130 to 182 degrees (black car). My > brothers blue metallic car is far to hot to grab the steering wheel whereas > the white car wasn't too bad. > > Also, watch the delivery drivers of UPS and FedEx. The darker UPS truck's > driver always seems more uncomfortable and sweating more than the FedEx > drivers in the white trucks. Appearances can be deceiving. Many years ago as a college project we had to build solar collectors. As part of the process we researched coating and colors. In most cases things that appear to be "black" do absorb more energy. However, there are cases where other coatings that appear to be a lighter color actually are better infrared absorbers and therefore can aborb more energy. Or another way of saying this - Things that appear to be black in the visible spectrum may or may not be black at other frequencies and this can have an effect on the overall amount of energy absorbed. However, in most cases, if it looks black in the visible spectrum, it is probably also "black" at other frequencies as well. Ed |
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