Cooling Tower Evaporation & Blowdown Calculator
Calculate evaporative thermal heat rejection, continuous blowdown volume, cycles of concentration (CoC), and makeup water flow in cooling towers.
Circulation & Thermal Range
Typical industrial range: 15°F - 25°F
CoC = Tower TDS / Makeup TDS
Standard: 0.00080 - 0.00095 per °F
Modern drift eliminators: 0.005%
Water Consumption & Balance
Evaporation Loss (E):
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Blowdown Water Rate (B):
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Total Makeup Water Demand (M):
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Drift Windage Loss (D):
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Daily Makeup Water Volume:
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Annual Makeup Water Cost:
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Cooling Tower Water Balance Equations
Wet cooling towers reject massive quantities of waste heat by evaporating a small fraction of circulating water. Because pure water vapor escapes while dissolved minerals (calcium, silica, chlorides) remain behind, mineral concentration increases. Blowdown water must be discarded to maintain salinity within scaling thresholds.
Standard Mass Balance Relations
E = 0.00085 · Q_circ · ΔT_range B = E / (CoC - 1) M = E + B + D