Consider a combined gas-steam power plant that has a net power output of 270 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 required rate of heat input in the combustion chamber. (You must provide an answer before moving on to the next part.) The required rate of heat input in the combustion chamber is [ KW.

Consider a combined gas-steam power plant that has a net power output of 270 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 required rate of heat input in the combustion chamber. (You must provide an answer before moving on to the next part.) The required rate of heat input in the combustion chamber is [ KW.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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11 A steam power plant operates according to the regenerative Rankine cycle with one feed water heater. The steam is delivered to the turbine at a boiler pressure of 3 MPa and a temperature of 350 °C, while the condenser is kept at a pressure of 5 kPa. Draw a T-s-diagram to illustrate the regenerative process, neglect feed pump work and calculate: The intermediate pressure at which the steam is bled off (use the average value of the temperature to determine the required pressure). The mass fraction of steam being bled off, and The Rankine efficiency.
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