In a closed water circuit there are no losses in the primary circuit, with clean water circulating at all times.
Recooling of the water in the primary circuit is achieved by cooling the outer surfaces of the coil system with water from the secondary circuit.
The secondary water is cooled by evaporation. In a counterflow design, fresh air is blown in from below, mixes with the secondary water, is heated and saturated by contact with the secondary water, and then expelled upwards. The atomised water from the secondary circuit is collected in a basin and re-used for spraying.
