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Evaporative Cooler Formulas
Evaporative Cooler Effectiveness:

E = Tedb – Tldb

Tedb – Tewb
x 100

Where:
Tedb = Dry Bulb Temperature Entering Media, °F
Tldb = Dry Bulb Temperature Leaving Media, °F
Tewb = Wet Bulb Temperature Entering Media, °F


Water Evaporation Rate Estimate:

Gallons per minute = V x (Tedb – Tldb)

500,000

Where:
V = Air Volume in cubic feet per minute, cfm
Tedb = Dry Bulb Temperature Entering Media, °F
Tldb = Dry Bulb Temperature Leaving Media, °F