Q1.The gas-turbine cycle of a combined gas-steam power plant has a pressure ratio of 8. Air enters the compressor at 290K and the turbine at 1400K. The combustion gases leaving the gas turbine are used to heat the steam at 15MPa to 450C in a heat exchanger. The combustion gases leave the heat exchanger at 247C. Steam expands in a high-pressure turbine to a pressure of 3MPa and is reheated in the combustion chamber to 500C before it expands in a low-pressure turbine to 10kPa. The mass flow rate of steam is 30kg/s. If the isentropic efficiencies of 100% for the pump, 85% for the compressor, and 90% for the gas and steam turbines. Analyze the cycle and determine (a) the mass flow rate of air in the gasturbins cycle, (b) the rate of total heat input, and (c) the thermal efficiency of the combined cycle. Q1.The gas-turbine cycle of a combined gas-steam power plant has a pressure ratio of 8. Air enters the compressor at 290K and the turbine at 1400K. The combustion gases leaving the gas turbine are used to heat the steam at 15MPa to 450C in a heat exchanger. The combustion gases leave the heat exchanger at 247C. Steam expands in a high-pressure turbine to a pressure of 3MPa and is reheated in the combustion chamber to 500C before it expands in a low-pressure turbine to 10kPa. The mass flow rate of steam is 30kg/s. If the isentropic efficiencies of 100% for the pump, 85% for the compressor, and 90% for the gas and steam turbines. Analyze the cycle and determine (a) the mass flow rate of air in the gasturbins cycle, (b) the rate of total heat input, and (c) the thermal efficiency of the combined cycle