Two air streams enter an industrial heating unit, as shown in Figure 6.A-10. Stream 1 enters at 71- 40°C, P, - 150 kPa with a volumetric flow rate of -0.30

m'/is and stream 2 enters at 7-25°C, P, = 100 kPa with a volumetric flow rate of V, = 0.10 m'/s. The heating unit is equipped with an electrical resistance heater that draws W, 11.5 kW. The air exits the unit at T, 55°C,P, = 105 kPa. The heating unit experiences a heat transfer with the surroundings at T. 25 °C.The heating unit operates at steady state. Model air as an ideal gas with constant specific heat capacities cy 0.717 kJ/kg-K and ep= 1.003 kJ/kg-K. A) Determine mass flow rate of air exiting the heating unit at state 3. B) Determine heat transfer rate from the device to the surroundings. C) Determine total entropy generation rate from the device.