The pressure condensator I think about, may be just like an airconditioner.
The main purpouse of an airconditioner is to make the air colder, and thats takes a lot of power. There are devices working to dry the air and it may be closer to the thing I think off. As the air keep water by the temperature, and pressure it may be possible to do it using less energy than a airconditioner have. If a compressed gas pressed out of a ventil it cool very fast, and then water will condensing. (Blow at your hand with your mouth open as much you can, the air is the same temperature as in mouth, but if you blow with your mouth so it is a narrow round passage for the air it feels cold). Its system like this I was thinking about. Mabe its better ways. If a lot of air gives a part of its moist, it should be quite a lot, and a windmill could do the work.