On Sat, 16 Mar 2013 19:10:26 -0700 (PDT), " firstname.lastname@example.org"
I posted on this a couple days ago without any citations. But here's
a paper that I was able to find and it's pretty much what I recalled
from several years ago when I went looking for the same info.
basically, the typical Auto AC compressor will run perhaps 6000-8000
BTU at idle speed. When you are cruising at high speed on a freeway
you can figure on between 20,000 to 30,000 BTU's depending on the type
of compressor. As I mentioned before, most add on system evaporators
are only 15,000 to 20,000 BTU capable and factory installed ones are
around 22-24,000. But that's only when the compressor can supply them
with enough freon. So at idle the system will only be as good as the
compressor is at idle speed.
there's an interesting article from 1969 here...
If that's true then there would be a 3 to 4X difference in cooling
between when the car is idling and when the car is at highway speed.
There is some difference, but it sure isn't 3 to 4x difference, not
And if you put a thermometer in front of the cold air outlets, there
would have to be either a huge variation in the volume or the temp of
the air exiting based on engine RPM. Again, there is some slight
variation in temperature, but it's not 3 - 4x.
Â As I mentioned before, most add on system evaporators
ooks?id=EyoDAAAAMBAJ&pg=PA117&dq=popular+sci...- Hide quoted text -
On Sun, 17 Mar 2013 04:47:00 -0700 (PDT), " email@example.com"
There are a couple issues on this. A LOT depends on the temperature
and humidity of the air you are cooling down. A lot also depends on
whether the vehicle body has been sitting out in the sun baking or
not. My experience with my 92 explorer says there is definitely a
difference of 3x. But that's when it's 105 in the shade and it NEEDS
the full capacity. Then you can tell a huge difference between the
cooling at idle and at speed, it's like night and day. This is pretty
much true on almost every car out here in AZ. Now if you are talking
about the difference when it's 85 degrees then sure, it seems to be
working nearly as good at idle as at speed. But that's because you
don't need 20,000 BTU's to cool things off, you only need 10,000. At
speed the compressor is very possibly off more then it's on.
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