Air enters the compressor of a regenerative air-standard Brayton cycle with a volumetric flow rate of 60 m3/s at 0.8 bar, 280 K. The compressor pressure ratio is 20, and the maximum cycle temperature is 2100 K. For the compressor, the isentropic efficiency is 92% and for the turbine the isentropic efficiency is 95%. The regenerator effectiveness of 85%. The pressure drops across a given stream in the regenerator and combustor can be neglected. Kinetic and potential energy changes are negligible. The outer walls of all components are thermally insulated. Use variable specific heat approach to indicate the air properties. a) Determine the rate of heat addition to the combustor, in MW b) Determine the thermal efficiency of the cycle c) Draw the processes in a T-s diagram
Air enters the compressor of a regenerative air-standard Brayton cycle with a volumetric flow rate of 60 m3/s at 0.8 bar, 280 K. The compressor pressure ratio is 20, and the maximum cycle temperature is 2100 K. For the compressor, the isentropic efficiency is 92% and for the turbine the isentropic efficiency is 95%. The regenerator effectiveness of 85%. The pressure drops across a given stream in the regenerator and combustor can be neglected. Kinetic and potential energy changes are negligible. The outer walls of all components are thermally insulated. Use variable specific heat approach to indicate the air properties.
a) Determine the rate of heat addition to the combustor, in MW
b) Determine the thermal efficiency of the cycle
c) Draw the processes in a T-s diagram
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