Ask The Experts – Cooling Tower Cycles of Concentration: Factors Determining Optimum Control Limits
By William Harfst
IWT Journal: Some of our readers are interested in learning more about cooling tower operation. We often hear about “cycles of concentration.” What are cycles of concentration in a cooling tower? How do they impact your water treatment program? William Harfst: Cooling towers are water conservation devices that enable the user to recycle cooling water through utility and process heat exchangers. They achieve their purpose by rejecting waste heat to the atmosphere by latent and sensible heat transfer. Approximately 0.1% of the water that flows through the cooling tower is evaporated for every 1 degree temperature drop across the tower.
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