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Thermodynamics MECH3001 - Assignment 2 Question 4
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A combined cycle gas-steam power plant that has a net power output of 150 MW. The pressure ratio
of the gas cycle is 11. Air enters the compressor at 300 K and turbine at 1100 K. The combustion
gases leaving the gas turbine are used to heat the steam at 5 MPa to 350°C in a heat exchanger. The
combustion gases leave the heat exchanger at 420 K.
An open feedwater heater incorporated with the steam cycle operates at a pressure of 0.8 MPa. The
condenser pressure is 10 kPa. Assuming isentropic efficiencies of 90 percent for the pump, 80 percent
for the compressor and 85 percent for the gas and steam turbines, determine:
a) The mass flow rate ratio of air to steam
b) The required rate of heat input in the combustion chamber
c) The thermal efficiency of the combined cycle
Answers (accounting for variation of Cp with temperature): a) 9.05 b) 373.9 MW c) 40.12%
of the gas cycle is 11. Air enters the compressor at 300 K and turbine at 1100 K. The combustion
gases leaving the gas turbine are used to heat the steam at 5 MPa to 350°C in a heat exchanger. The
combustion gases leave the heat exchanger at 420 K.
An open feedwater heater incorporated with the steam cycle operates at a pressure of 0.8 MPa. The
condenser pressure is 10 kPa. Assuming isentropic efficiencies of 90 percent for the pump, 80 percent
for the compressor and 85 percent for the gas and steam turbines, determine:
a) The mass flow rate ratio of air to steam
b) The required rate of heat input in the combustion chamber
c) The thermal efficiency of the combined cycle
Answers (accounting for variation of Cp with temperature): a) 9.05 b) 373.9 MW c) 40.12%
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