Air at 1 atm, 13oC and 55 percent relative humidity is first heated to 28oC in a

Question:

Air at 1 atm, 13oC and 55 percent relative humidity is first heated to 28oC in a heating section and then is passed through an evaporative cooler where its temperature drops to 22oC. Determine
(a) The exit relative humidity and
(b) The amount of water added to the air in kg H2O/kg dry air.