The AC condenses the water and removes it from the car
tweake,
May 18, 5:03pm
the main point was that replacing wet air with air thats gone through the aircon and dried out is far quicker than having the aircon dry the air in the car. your basically pushing wet air outside and replace it with dry air. (technically it doesn't quite work that simply)
even without the aircon, heating the air gives it a lower humidity value and it can absorb more water. so even if its 100% humidity outside, heating it will allow some drying to happen. of course after its gone through the aircon and then heated it has a lot more water absorbing ability.
heating the windscreen also stops condensation forming on it in the first place.
daryl14,
May 18, 6:08pm
tweake wrote: post hasn't changed, you just missed the bus thats all.
Hard to catch the bus when it leaves the road and flies off into anti physics land: tweake wrote: make sure its on fresh air.
Where is this fresh, dry air coming from? You can have fresh damp air from outside or Recirculated air from inside. Both of which can be dried by the A.C. I think you know this but the way you explained it was a little weird.
IMO having it on fresh or recirc should make no difference if the A.C is on. It's still gonna get dried. But would you rather dry just your cabin air or all the fresh air coming in from outside?
gsimpson,
May 18, 6:22pm
If you have a day with high humidity then it may make a difference drawing air in from outside as the AC will have a harder job drying the fresh air rather than just drying the recirculated air.
tweake,
May 18, 6:46pm
it makes a huge difference.
the speed at which aircon removes water is fairly slow. outside air is rarely 100% unless your driving through fog. its simply more effective to remove the the high humidity air, aircon is a bonus. i don't have aircon on some of my vehicles and have no problem demisting windows. aircon is not actually required to dry out a car. just like clothes on a clothes line will still dry on a cold day. you just need lots and lots of slightly drier airflow and to get rid of the wet air.
i've worked at night, in the rain. so hot, soaking wet and cold windscreen, in a single cab ute. chronic for fogging up windows. car are never as bad. trust me it works.
daryl14,
Jan 25, 4:48am
I think it probably takes a few minutes of running the A.C for it to build up pressure and so start cooling it's heat exchanger. After that I reckon the air drying effect should be pretty much instant.
Agree, not having A.C but just having a heater on demist has worked fine in cars for many years. But the A.C will help to demist way before the engine can get can get warm enough to make the heater work.
of course, some vehicles have big heater units and grunty fans and some have totally asthmatic piles of crap.
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