Quote:
Originally Posted by TrevorW
Just a thought in the car we turn the air con on to demist the windows ie: colder air
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The aircon compresses gas which cools it. This causes condensation at the
point (somewhere under the bonnet) where the heat is exchanged with the air you are blowing through your car. You get nice cool, dry air inside, and a puddle of water outside. You can't cool air below its
dew point without water condensing. Same with your home airconditioner - thats why they have those drains that run the condensation outside.
By airconditioning your car, you are lowering the temperature - but also sucking all the moisture out of the air inside, which lowers the relative humidity. Thats why it works as a demister - not because its cool.
If you remember the days before aircon in cars - you had no choice but to crank the heat right up to try to evaporate the moisture on the windows - but that just made the inside really steamy. So you ended up with the heat way up and the window open!
Adam