A basic Brayton cycle is to be combined with a basic Rankine cycle with superheat to form...

A basic Brayton cycle is to be combined with a basic Rankine cycle with superheat to form a combined cycle. The air enters the compressor of the Brayton cycle at 100 kPa and 25°C, is compressed to 1200 kPa, and is heated in the combustor to 1400 K. The isentropic efficiency of the compressor is 0.78, and of the gas turbine is 0.80. The mass flow rate of the air is 200 kg/s. The exhaust gases from the turbine are sent through a heat exchanger to heat the water in the Rankine cycle. The exhaust gases from the Brayton cycle exit the heat exchanger at 80°C. The steam exits this steam generator at a pressure of 15 MPa and a temperature of 400°C. The condenser pressure of the Rankine cycle is 10 kPa, the isentropic efficiency of the steam turbine is 0.80, and the isentropic efficiency of the pump is 0.70. Considering no additional heat to be added to the steam, determine (a) the mass flow rate of the steam in the Rankine cycle, (b) the total net power produced in the combined cycle, and (c) the thermal efficiency of the combined cycle.