In an ethylene production plant in Nilai, an air compressor is powered by a direct-coupled steam turbine that is also driving a generator. Initially, both air compressor and steam turbine are well- insulated when the plant is newly launched; however, the unresistant insulation layer eventually wore off after 3 years owing to photodegradation under prolonged sunlight exposure. For the routine operation, steam enters the turbine at 9 MPa and 700C at a rate of 19.2 kg/s and exits at 0.075 MPa and a quality of 0.86 while air enters the compressor at 0.115 MPa and 30C at a rate of 8.73 kg/s and exits at 2.31 MPa and 487C. During winter day, the air compressor at the outside is experiencing a heat loss of 61.8 kW, but the steam turbine that constructed near the waste incinerator is receiving heat at a rate of 47.5 kW. Assume steady operation. 2.31 MPa 487C Air compressor 2 0.115 MPa 30C @ 25279.05 kW 303.21 kJ/kg, 216.23 kJ/kg, 778.18 kJ/kg, 560.01 kJ/kg 25264.75 kW 9 MPa 700C Steam turbine 0.075 MPa 4 (a) Determine the properties (internal energy and enthalpy) of air in inlet and outlet streams. (5 Marks) (b) Determine the properties (internal energy and enthalpy) of steam in the inlet and outlet streams. 3876.1 kJ/kg, 3438.8 kJ/kg, 2343.52 kJ/kg, 2200.51 kJ/kg Q CONFIDENTIAL (c) Determine the net power delivered to the generator by the turbine on the winter day when the production plant is still new. (5 Marks) (5 Marks) (d) Determine the net power delivered to the generator by the turbine on the winter day after 3 years of operation. (5 Marks)