Conclusion:
You should use Psychometric Charts to find (kg H2O)/ (kg Air), you can determine this ratio by 2 known parameter of "Dry Bulb Temp, Wet Bulb Temp, Relative Humidity, Humidity Ratio and Enthalpy". The below site explains how to obtain the desired parameter from psychometric charts or simply use the uploaded G&P software:
[link Point to another website Only the registered members can access]
Then go to the composition tab in HYSYS and change basis into "Mass Fraction" and enter the proper fraction which obtained from the charts or software.
Good Luck
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