Consider Death Valley;100 plus heat and DRY air.
Yet you still need to remove the HEAT from your auto to be
comfortable,rather than just use the fan to pull in dry outside air that's
around 120 degF.
To repeat,AC is a HEAT transfer device,and you have to remove the
interior heat to be comfortable.
few people use their auto AC in such temps.
such a use is SECONDARY to the primary purpose of -removing HEAT- from an
I live in central FLORIDA,and I know all about humidity,and about hot cars.
It's a lot better than just relying on a dehumidifier to remove
moisture from a building. The heat that the dehumidifier generates while
removing the moisture builds up rapidly. Better to vent the heat outside
auto operators manuals all tell owners to use the AC periodically in winter
months so it gets lubricated and doesn't rust up.If they have to tell
owners that,then frequent use in winter is not common.
It used to be that most cars sold up North didn't have AC,unless ordered as
an option.(and they were hard to sell down south without AC)
Since foreign carmakers began bundling it as standard,that's changed,I
BTW,I grew up in Buffalo and lived in the North for many years.
a -secondary- part.Not the primary purpose of auto AC.
note there is a temperature control on every auto AC,but no humidity
wrong. ambient temperature DOES matter to the body.
THAT is what makes one sweat,not how much humidity is present.
not as uncomfortable as a hot interior of a auto,at 100-140 degF or even
more,despite how dry it might be.
the purpose of auto AC is to remove heat from the interior of the auto.
moisture content doesn't matter in that respect.
the heat is what makes a person perspire. not the humidity.
if the air temp inside is 110 degF,it doesn't matter to the human body if
the humidity is only 10%.
Both are somewhat true, though the temp is a bit more important, IMO.
If the humidity is high, when you sweat, it does not evaporate, and
therefore does nothing to lower your body temp. That is why it seems
more uncomfortable to be in Southern Florida at 100 F than in Arizona
at the same temp. BUT, so long as the temp is 100 F, you're going to
be hot, and no amount of de-humidifying is going to change that.
And in a car, the temp will be even higher.
Therefore, you need cool air to reduce the temp, and some measure of
de-humidification, especially in very humid climates, to help your
body cool itself.
Also, the warmer air is, the higher a percentage of absolute humidity
it can hold. 70 degree air simply holds less moisture than 100 degree
air does. If you can lower the temp on the inside of the vehicle, it
will be less humid by definition...
Joe - Linux User #449481/Ubuntu User #19733
joe at hits - buffalo dot com
No, moisture removal--necessary for the body's evaporative cooling
mechanism to work--is the primary goal.
To remove moisture, one uses the concept of condensation--which requires
a cool surface to move the moist air over.
so.....you have an air conditioner in your car and/or home that's full
of hygroscopic materials?
My question to jim was, in the context of this conversation, how are you
removing moisture without condensing it onto a cooler surface?
you could do it with pressure changes - moisture condensation is always
a problem in paint shops and there's no significant temp change in air
lines there - unlike a/c systems.
i appreciate that you think dehumidification is a great thing, and maybe
it is a side-benefit of having a/c, but the objective of the equipment
is not to simply dehumidify. if it were, it wouldn't go to the trouble
and expense of venting waste heat to the outside of the vehicle, it
would be used to re-heat the dehumidified air inside the car and thus
save on componentry and energy.
In the context of this conversation? Seriously?
But I thought you wanted COOL air.
And you don't remove moisture by heating. You change the dew point, but
you don't remove moisture.
Condensation removes moisture.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.