On Apr 27, 1:21 pm, "Leon" wrote:
"Robatoy" wrote in message

oups.com...



Water vapour condenses when the water/air mixture is
compressed...ASSUMING the temperature stays the same...which it won't
as air temperature increases when the pressure does during
compression...... so we wait till it cools to the original ambient
inle temperasture.... then it condenses.

Water vapor condenses regardless of pressure. Ever take a glass of ice
water out side on a hot humid day? You get condensation on the cool sides
of the glass. The condensation is formed when the humid air that has been
heated up during compression, enteres the cooler compressor tank.

That's what I said, and I quote, including some fat, laptop induced
typos: "so we wait till it cools to the original ambient inle
temperasture.... then it condenses"

IOW.. when it cools.

You can transfer humid compressed air to another container and there will
be no condensation inside the tank as long as the temperature remains the
same.

If the air being transferred is humid, it condenses when it cools.
When you move 100 gallons of 10% humid air into a 50 gallon container,
the air compresses, but the water does not. The air/water ratio will
therefore become 20%...by volume of humid air. I can put 400 gallons
of 14.psig air into a 50 gallon tank..and all the water will go in
there with it.
As the volume decreases, the temperature and pressure increase... but
the quantity of water stays the same.

IOW.. when I shove 100 gallons of air which contains 1 pint of water,
into a 50 gallon tank, the pressure and temperature go up
proportionally, but that pint of water stays a pint. Then when the
whole mess cools off, the dewpoint now changes and the increased
humidity condenses... and there is no way to reduce the quantity of
air's occupying space without heating it up in the process.
I think I got that right..LOL

Have you ever wondered why portable air tanks seldom if ever have no
bleeder valve for releasing water?

I had never given that any thought... but I think that's related to
duty-cycle.. just not enough air going through to matter.