I really appreciate the feedback.
J.C. - no water would condense on your turbine because we are in an isothermic environment, everything is at 70F.
PZK - Water naturally mixes with air. There is a limit depending on the air temp. In a closed system, humidity will be at 100% regardless of Temp.
Eise- Im not a chemist but there are so many different water attracting substances. It depends on which one you are using. I calculated the energy to remove water from one substance by reverse osmosis and it was doable.
It is an easy calculation. Just water weighs 18g per mole, 3785grams/gallon, 210moles per gallon, 1 gallon weighs 8.3 lbs, 1 footpound =1.36 Joules. So, if we had a hygroscopic substance that absorbed twice it's weight in water and we
started with 100lbs of the substance, it would absorb 200lbs of water. If we had it at 1000ft, we would get 100,1000 foot pounds of energy or 136,000 joules. That would be 1000 watts for over 2 mins. At 10,000 ft, we would have a hair dryer running for 20 mins. We need a chemist to find the right hygroscopic substance for us. Do you know one. He would probably have an immediate answer. Common knowledge for a chemist.
Strange- Interesting idea, but the hygroscopic substance binds with water and would run at all. Your right about picking the best hygroscopic substance that we have to remove the water from. We have a lot of play on the energy available, just by raising the dry substance before it soaks up the air mositure.
Swan - I think your right, we want a hygroscopic substance that absorbs lots of water but is lightly bound to it. So we have the surplus energy(from harvesting the positional or gravitational potential energy), after removing the water.