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An HVAC cooling tower is used for disposing or rejecting heat from chillers. Air cooled chillers are less effecient than water cooled chillers due to rejection of heat from tower water near wet-bulb temperatures.
The water cooling towers chills the fluid by the use of water instead of air cooling and is recognized as most efficient. In this case the condenser does not cool the hot refrigerant with ambient air, but uses a cooling tower.