SYSPHS12 — The restriction of "vapor" to the range 0..1 in EvaporationCalculation2 seems completely arbitrary

The restriction of "vapor" to the range 0..1 in EvaporationCalculation2 seems completely arbitrary, it is not a ratio. Dimensional analysis and the names of conversion parameters and related value properties indicate it's a volumetric flow rate:

p.92 Figure 79: Humidifier constraint blocks

p97 Figure 91: Parametric diagram applying the second evaporation calculation constraint

{vapOut=g*(((max(min(vapor,1),0))*max((temp-boil),0)/(temp-boil))+np(max((boil-temp),0)/(boil-temp)))}

This part is not necessary:

max(min(vapor,1),0)