Air enters the compressor of an 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%. Determine (a) the net power developed, in MW. (b) the rate of heat addition in the combustor, in MW. (c) the thermal efficiency of the cycle. 9. 55 Air enters the compressor of a simple gas turbine at p1 5 14 lbf/in. 2, T1 5 5208R, and a volumetric flow rate of 10,000 ft3/min. The isentropic efficiencies of the compressor and turbine are 83 and 87%, respectively. The compressor pressure ratio is 14 and the temperature at the turbine inlet is 25008R. On the basis of an air-standard analysis, calculate (a) the thermal efficiency of the cycle. (b) the net power developed, in hp. (c) the rates at which entropy is produced within the compressor and turbine, each in hp/8R
