TYPE OF COOLING TOWERS
July 15, 2022 at 10:08 AM
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Cooling water systems remove heat generated from a variety of industrial processes. There are two basic types of cooling water systems. Once-through, open recirculating, and closed recirculating cooling water systems. This publication describes once-through and open recirculating systems.
OPEN RECIRCULATING COOLING WATER SYSTEM: Open recirculating cooling water systems are open to the atmosphere and continuously recycle and reuse the cooling water. These systems are composed of an evaporator unit, a cooling tower, or an evaporative condenser. These units mix air and water and allow some of the water to evaporate, cooling the balance of the water volume. The cooled water is then circulated to heat exchangers or chillers, where heat is added to the cooling water thereby removing heat from the process flow stream. The warmed water is then circulated to the cooling tower, where the cycle is repeated.
CLOSED RECIRCULATION COOLING WATER SYSTEM: Closed recirculating systems have many advantages. They provide better control of temperatures in heat-producing equipment, and their small makeup water requirements greatly simplify control of potential waterside problems. Makeup water is needed only when leakage has occurred at pump packing or when water has been drained to allow system repair. Little, if any, evaporation occurs.
