1. The problem statement, all variables and given/known data Moist air leaves the humidifying unit of a “winter” air-conditioning plant at a rate of 0.6 m3 /s. The air has a temperature of 30°C and is 60% saturated. Dry saturated steam at 100°C is supplied to the unit at a rate of 7.015 g/s. Determine the specific humidity and temperature of the air entering the unit, assuming that the pressure is 1.01325 bar throughout. 2. Relevant equations steady flow equations e/g -Qin = ma(H2-H1) etc.. psychometric chart analysis 3. The attempt at a solution I usually am comfortable solving such questions however do not know how to set it up in order to begin. I am confused by the use of the word unit and have never seen a question on an air conditioning system that gives me the value of temperature and mass flow rate of steam entering the humidifier. Isn't it the steam that humidifies the air and usually in these types of questions the temperature and relative humidity of the air/water entering the system and leaving the system are given however in this case theyre only given for the water leaving and for the steam that humidifies the air into water. I have no idea how to incorporate or make use of the steam values, nor can i find any similar examples on youtube or google, and would greatly appreciate anyones input. My problem here is where to begin rather on how to solve the whole question.