A gas-turbine power plant operates on the regenerative Brayton cycle between the pressure limits of 100 and 700 kPa. Air enters the compressor at 25 °C at a rate of 12.6 kg/s and leaves at 260 °C. It is then heated in a regenerator to 400 °C by the hot combustion gases leaving the turbine. A diesel fuel with a heating value of 42,000 kJ/kg is burned in the combustion chamber with a combustion efficiency of 97 percent. The combustion qgases leave the combustion chamber at 871 °C and enter the turbine whose isentropic efficiency is 85 percent. Using variable specific heats to determine (a) the second-law efficiencies of the compressor, the turbine, and the regenerator, (b) the rate of the energy flow with the combustion gases at the regenerator exit, and (c) the entropy generation and exergy destruction through the regenerator and combustion chamber. Regenerator Combustion chamber 400°C 100 kPa 871°C 30°C 700 kPa 260°C Turbine Compressor

A gas-turbine power plant operates on the regenerative Brayton cycle between the pressure limits of 100 and 700 kPa. Air enters the compressor at 25 °C at a rate of 12.6 kg/s and leaves at 260 °C. It is then heated in a regenerator to 400 °C by the hot combustion gases leaving the turbine. A diesel fuel with a heating value of 42,000 kJ/kg is burned in the combustion chamber with a combustion efficiency of 97 percent. The combustion qgases leave the combustion chamber at 871 °C and enter the turbine whose isentropic efficiency is 85 percent. Using variable specific heats to determine (a) the second-law efficiencies of the compressor, the turbine, and the regenerator, (b) the rate of the energy flow with the combustion gases at the regenerator exit, and (c) the entropy generation and exergy destruction through the regenerator and combustion chamber. Regenerator Combustion chamber 400°C 100 kPa 871°C 30°C 700 kPa 260°C Turbine Compressor

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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Question

A gas-turbine power plant operates on the regenerative Brayton cycle between
the pressure limits of 100 and 700 kPa. Air enters the compressor at 25 °C at a
rate of 12.6 kg/s and leaves at 260 °C. It is then heated in a regenerator to 400
°C by the hot combustion gases leaving the turbine. A diesel fuel with a heating
value of 42,000 kJ/kg is burned in the combustion chamber with a combustion
efficiency of 97 percent. The combustion qgases leave the combustion chamber
at 871 °C and enter the turbine whose isentropic efficiency is 85 percent. Using
variable specific heats to determine (a) the second-law efficiencies of the
compressor, the turbine, and the regenerator, (b) the rate of the energy flow
with the combustion gases at the regenerator exit, and (c) the entropy
generation and exergy destruction through the regenerator and combustion
chamber.
Regenerator
5)
Combustion
chamber
400 C
100 kPa
30°C
3
871°C-
700 kPa
260°C
Compressor
Turbine

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