Air enters the evaporator section of an air-conditioner at 100 kPa, 27 C with a volumetric flow rate of 6 m^3 /min. R-134a enters the evaporator at 120 kPa with a quality of 0.3 and rate of 2 kg/min and it leaves as a saturated vapor at the same pressure. Determine (a) the exit temperature of the air and (b) the rate of entropy production (kW/K) for the process in two ways: (i) Assume the outer surface of the evaporator is insulated. (ii) Assume the outer surface is not insulated and heat is transferred from the surrounding medium which is at 32 C to the evaporator at a rate of 30 kJ/min.