On Sat, 29 Mar 2008 10:14:41 +0000, The Natural Philosopher wrote:

air has to provide the heat to
change the state of the water from liquid to vapour.

No heat is required: All that is required is that the air is not saturated
with water.

It's simple physics, if you remove water by saturating or increasing the
RH of a volume of air you either provide heat at 2.3MJ/kg of water
vapourised or the air temperature drops.

I shall not comment on the your further naive assumptions about kiln
drying.

AJH