9-84: Agas-turbine power plant operates on a simple Brayton cycle between the pressure limits of 100 and 1200kPa. The working fluid is air which enters the compressor at 30 degrees celsius at a rate of 150m³/min and leaves the turbine at 500°C. Using Variable specific heat of air and assuming a compressor isentropic efficiency 82 percent and a turbine efficiency of 88 percent. determine
a) the net power output
b) the back work ratio
c) the thermal efficiency.