Water-cooled portable air conditioners are intended to be rolled into a room near the source of the heat. They are intended for room cooling only. Water-cooled units cannot be ducted and do not use nozzles like their air-cooled counterparts.
Since the air conditioner is inside the space requiring cooling, you must remove the heat that is produced by the air conditioner. Water cooled units use water instead of air to remove this heat. The unit requires a water supply, water return, and a place to drain condensate.
As the cold air from the cooling side of the unit offsets the heat being produced in the room, the temperature in the room begins to drop. The actual temperature drop is determined by the capacity of the unit, the amount of heat being added to the room, and the size of the room.