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Key to the industrial cooling system is the water cooler, which can be one of three types depending upon the application and required cooling water or coolant temperature. This can range from ambient temperature to sub zero for more specialised processes.
A water cooling tower is a commonly used device but one that requires strict attention to water quality. Evaporative cooling towers will cool water to within a few degrees of the wet bulb ambient temperature and are available in open circuit or closed circuit, induced draft or forced draft construction.
An air blast cooler, sometimes known as a dry air cooler, or closed circuit cooler, can also be used within an industrial cooling system to produce a supply of cooling water, cooled to some temperature close to the ambient dry bulb temperature, typically 35°C.
Many industrial processes require cooling water at temperatures lower than those possible from cooling towers or air blast coolers. These lower temperatures can be achieved with a water chiller, or for sub zero temperatures, a glycol chiller.
Chillers and air blast coolers have the benefit of being able to operate within a closed circuit cooling system, minimising the requirements for water treatment.
