Moist air at 13°C db-temperature and 55% relative humidity enters a winter air conditioning system, consisting a preheater and an air washer. The supply air leaving the air washer is at 32°C...

Moist air at 13°C db-temperature and 55% relative humidity enters a winter air conditioning system, consisting a preheater and an air washer. The supply air leaving the air washer is at 32°C db-temperature and 18.3°C wb-temperature. The mass flow rate of dry air is 0.3 kgsí1 . The pressure is constant at 101.3 kPa. Determine (i) the db-temperature of the air at the exit of the preheater, (ii) the heat input rate by the preheater, (iii) the rate of moisture addition in the air washer, and (iv) the saturation effectiveness of the air washer.