A gas-turbine power plant operates on the regenerative Brayton cycle between the pressure limits of 200 and 800 kPa. Air enters the compressor at 40 °C at a rate of 13.2 kg/s and leaves at 280 °C. It is then heated in a regenerator to 500 °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 98%. The combustion gases leave the combustion chamber at 920 °C and enter the turbine whose isentropic efficiency is 90%. Treating combustion gases as air and using constant specific heats at 600 °C, determine the following 1- the isentropic efficiency of the compressor 2- The effectiveness of the regenerator 3- The air-fuel ratio in the combustion chamber
A gas-turbine power plant operates on the regenerative Brayton cycle between the pressure limits of 200 and 800 kPa. Air enters the compressor at 40 °C at a rate of 13.2 kg/s and leaves at 280 °C. It is then heated in a regenerator to 500 °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 98%. The combustion gases leave the combustion chamber at 920 °C and enter the turbine whose isentropic efficiency is 90%. Treating combustion gases as air and using constant specific heats at 600 °C, determine the following
1- the isentropic efficiency of the compressor
2- The effectiveness of the regenerator
3- The air-fuel ratio in the combustion chamber
4- The net power output and the back work ratio
5- The thermal efficiency
6- The second-law efficiency of the plant
7- The second-law efficiencies of the compressor, the turbine, and the regenerator
8- The rate of the energy flow with the combustion gases at the regenerator exit
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