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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.
A water cooling reservoir is essential for a properly built water cooling system. Along with a quality water pump and radiator, a liquid cooling reservoir will increase the cooling power of your system by increasing the amount of water in the system, and therefore the amount of heat the system can dissipate.