A room is heated and ventilated by the system shown in the sketch. Outside air enters at point 1 at T = 5C, = 40%, and is mixed with air returning from the room at T, = 25C, -40%. This air is then heated and humidified with cool liquid water. The pressure is 100 kPa throughout. The mass flow rate of outside air is m = 5 kg dry air/min, while the recirculated air mass flow rate is also m = 5 kg dry air/min. (a) (5 marks) Determine the temperature and relative humidity of the air at point 2. (b) (2 marks) Assuming that state 4 and state 5 are the same, show all the processes in the system on a sketch of a psychrometric chart. (c) (5 marks) Determine the temperature at point 3 and the heat input required in kW. m 1 2 MR mw 4 Room 5