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a device uses the return to the chiller to cool the water that enter the cooling tower....heat exchange device .
To pre-cool the hot side prior to cooling coil is known as economizer. It can be used for both water as well as air.
Economizer in chiller system is the mechanical device or unit allowing to reduce energy consumption and improve the efficiency of chiller system. This is done by cooling the hotter side either outside the building or inside. It is modification of chiller system or chiller itself whose initial cost is covered by significant economic benefits from the further operation. this by using cool outside air means cooling indoor space, When the temperature of outside the building is less than the recirculated air , the condition of outside is more energy efficient then conditioning recirculated air and vice versa
One possibility is installation of an additional low-cost equipment like the economizer system in the chiller system.