Thermodynamic Of The Cooling Towers

Air-cooled condensers are economically designed to lower the temperature of condensation of the refrigerant about 20F (12C) above the DB temperature of the atmosphere. With the WB, the temperature of the atmosphere die, as a rule, lower than the DB temperature, cooling towers, capable to lower the temperature of condensation of the refrigerant 7 to 10F (4 to 6C) above, the WB, the temperature of the atmosphere. These figures correspond to levels approaching 35 F (20C) lower than the temperature of condensation of air-cooled condenser. This feature improves performance and cooling system efficiency and reducing energy consumption.

The tower cools capacitor or process water by means of energy and mass transfers. Energy transfer occurs as sensible heat exchange with the air passing through the tower, altering the DB temperature. The amount of sensible heat is transferred directly proportional to the temperature difference between the water and the atmosphere, passing dirough tower. Although sensible heat transfer, as well as the function of the airflow and water moving through the tower, these rates are fixed capacity of the cooling tower fan and pump. Consequently, die energy transfer occurring in the tower remains primarily a function die difference between the current temperature of the liquid.

While the transfer of energy occurring in the tower is a function DB temperature of liquids, the mass transfer is a function of the WB, the temperature of the atmosphere entering the tower. As WB depression increases, die amount of water vapor, leaving the tower also increases. Increasing the speed of evaporation decreases water outlet temperature die tower...