Looking at the cool tower from 'outside' and inside of the space it cools. On the 'outside' view on the right, breezes blow through corrugated panels saturated with water. The desiccation of these panels cools the air, and this cool air falls down to the base of the tower and out into the space that it is to cool.
There is a formula for the size of the tower as related to the size of the space it cools. I've had the opportunity to experience a couple of these, and it's remarkable how effective they can be.