Mass Transfer
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

They are always equal under all circumstances
Water has a high latent heat of evaporation
Solubility of the components of air in water is very small
Lewis number is close to unity

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Mass Transfer
McCabe-Thiele method

Is more accurate than Ponchan-Savarit method
Uses molal units for material and energy balance
Uses weight fractions to express liquid and vapour composition
Can use any type of units

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