Re: Spontaneous Windshield Breakage?!?)

[audistuff@juno.com (Paul R Anderson)]

>e
>the same make and model of a car of wich I can't remember, with
>different paint.
>
>As expected, the White car was the coldest one.
>The surprise was that the read car became hotter than the black car.
>
>Anybody who know if this is true for all cars, that red cars become
>the hottest one ?.
>
That doesn't make sense to me.  There is a lot more going on here,
though,
than just black vs. red.  
#1
It seems to me, the red will reflect more of the
red to infrared section of the spectrum than the black.  this would lead
to
lower temps because of less absorption.

#2
Direction of parking.  If cars were not parallel, different angles of
attack by
solar rays.

#3
Finish on car.  If they do not have the same top coat or wax on the
surface of the
paint, there is a different coefficient of refraction, affecting the
transmittance/reflectance ratio.

#4
tinted vs. non-tinted windows.  Tinted will absorb more heat unless
compensated
for by a reflective coating as well.

#5
Interior/upholstery color.  Probably has more to do with it than exterior
color.
sun comes in, heat absorbed by uphostery, rediated as infrared heat which
can't get through the glass except by conduction.  Very similar to the
way the sun warms the earth.

#6
. . . 

You get the picture.  The best way to see if the exterior color is the
determining
factor is to do an underhood or in the trunk or under the fuel filler
door  temp comparison.


Paul Anderson:
Any direct correspondence, please put my name in the subject line so I
don't miss it.
Please send any direct mail to my private address as I don't keep up with
the list very well.
 Private email AndersonPaul@juno.com


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