Maximum Evaporative Cooling (Emax)

Maximum Evaporative Cooling (Emax)

HS-04
ASPCSPAdvanced

Formula
Emax = 2.4 × v^0.6 × (42 − vpw)
When to Use

Calculate the maximum rate of evaporative heat loss possible given air speed and humidity.

Symbol Legend
SymbolMeaningUnitNote
EmaxMaximum evaporative heat loss possiblekcal/hr or BTU/hr
2.4Clothing-related constantAssumes normal work clothing
vAir velocityfpm
vpwVapor pressure of water in the airmmHg
42Water vapor pressure of skin at 95°FmmHgConstant

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