ASHRAE indoor-pool relation Wp=0.1A(Pw-Pa)Fa as documented by EnergyPlus, approximating latent heat as 1060 Btu/lb and surface air velocity 10–30 ft/min. Both pressures are water-vapor pressures in inHg, not atmospheric pressure. Negative pressure difference yields zero evaporation, not a condensation prediction. Excludes outdoor pools, boiling, solvents and equipment sizing certification.
ASHRAE indoor-pool relation Wp=0.1A(Pw-Pa)Fa as documented by EnergyPlus, approximating latent heat as 1060 Btu/lb and surface air velocity 10–30 ft/min. Both pressures are water-vapor pressures in inHg, not atmospheric pressure. Negative pressure difference yields zero evaporation, not a condensation prediction. Excludes outdoor pools, boiling, solvents and equipment sizing certification.
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0.1*area*max(0,surfacePressure-airPressure)*activity0.1*area*max(0,surfacePressure-airPressure)*activity*0.45359237