Moist air enters a device operating at steady state at 1 atm with a dry-bulb temperature of 55C and a wet-bulb temperature of 25C. Liquid water at 20C is sprayed into the air stream, bringing it to 40 C, 1atm at the exit. Determine
a. the relative humidities at the inlet and exit.
b. the rate that liquid water is sprayed into the air stream, in kg per kg of dry air.