"Elmo P. Shagnasty" wrote in news: snipped-for-privacy@mara100-84.onlink.net:
but not comfortable. and not much cooler. sweating heavily in the 100plus -dry- desert heat still does not make a person comfortable. But the cool air of AC removes that heat and allows comfort.
Yes,it is. AC is primarily a HEAT transfer device. It's not specifically designed to remove humidity,but to remove HEAT.
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.
"Elmo P. Shagnasty" wrote in news:elmop- snipped-for-privacy@mara100-84.onlink.net:
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 auto interior.
I live in central FLORIDA,and I know all about humidity,and about hot cars.
"Few People" Man you need to get out more. Using the A/C in the winter months when there is snow and ice clears the windows of condensation so quickly.
Removing the humidity is part of removing the heat from a vehicle or building.
correct. but it's also correct that hotter air can hold more moisture. that doesn't make it "dry", but the proportion relative to saturation decreases.
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 too.
jim beam wrote in news:MPadnT8K8rhgN7LXnZ2dnUVZ snipped-for-privacy@speakeasy.net:
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 believe. 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 control.
Incorrect. Expansion of compressed gases is what causes the cooling effect. The removal of moisture is a side effect.
One can dehumidfy one's car without cooling it. I frequently have the compressor on during the winter to dry out the air, even though I'm also running the heater.
while that effect exists, it's small beer compared to the real heat exchange mechanism - that of changing phase from liquid to gas. it's liquid /evaporation/ that causes the cooling effect.
"Elmo P. Shagnasty" wrote in news: snipped-for-privacy@mara100-84.onlink.net:
no,it doesn't.
63 deg "incredibly moist air" is not a "primary" reason for AC.
AC is primarily to remove -heat- from the interior,not moisture. The vast majority of AC usage is for HOT interiors.
People do not get into their hot cars and say "oh,it's too humid in here,turn on the AC",they think "it's too HOT,turn on the AC" to remove the heat,to get COOL AIR flowing on them,cooling them.
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