Prob. I: A peak-load generator is to be powered by a simple gas turbine with free power turbine delivering 20 MW of shaft power. The following data are applicable: Compressor pressure ratio 11.0 Compressor isentropic efficiency 0.82 Combustion pressure loss 0.4 bar Combustion efficiency 0.99 Turbine inlet temperature 1150 K Gas-generator turbine isentropic efficiency 0.87 Power turbine isentropic efficiency 0.89 Mechanical efficiency (each shaft) 0.98 Ambient conditions Pa, Ta 1 bar, 288K Calculate the air mass flow required and the specific fuel consumption (SFC)