Consider a combined gas-steam power plant that has a net power output of 280 MW. The pressure ratio of the gas turbine cycle is 11. Air enters the compressor at 300 K and the 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. Assume isentropic efficiencies of 100 percent for the pump, 82 percent for the compressor, and 86 percent for the gas and steam turbines. Determine the thermal efficiency of the combined cycle. The thermal efficiency of the combined cycle is %.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Consider a combined gas-steam power plant that has a net power output of 280 MW. The pressure ratio of the gas turbine
cycle is 11. Air enters the compressor at 300 K and the 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. Assume isentropic efficiencies of 100 percent for the pump, 82 percent for the compressor, and 86 percent for
the gas and steam turbines.
Determine the thermal efficiency of the combined cycle.
The thermal efficiency of the combined cycle is
%.
Transcribed Image Text:Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Consider a combined gas-steam power plant that has a net power output of 280 MW. The pressure ratio of the gas turbine cycle is 11. Air enters the compressor at 300 K and the 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. Assume isentropic efficiencies of 100 percent for the pump, 82 percent for the compressor, and 86 percent for the gas and steam turbines. Determine the thermal efficiency of the combined cycle. The thermal efficiency of the combined cycle is %.
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