In principle - the basic evaporating cooling system use only water and a blower to cool circulated air.
When warm, dry and unsaturated air is pulled through a water - saturated medium water evaporates from the medium to vapour in the air. The evaporation energy comes from the air which is cooled down.
Evaporation differs from boiling and can be accomplished at a temperature lower than the boiling temperature of water because it occurs at the liquid-vapour interface.
Evaporative cooling can be implemented with

INDIRECT - DIRECT EVAPORATIVE COOLING SYSTEM 2 STAGE AIR WASHER

INDUSTRIAL AIR WASHER DIRECT EVAPORATIVE COOLING SYSTEM
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