A gas-turbine power plant operates on the simple Brayton cycle between the pressure limits...

A gas-turbine power plant operates on the simple Brayton cycle between the pressure limits of 100 and 2000 kPa. The working fluid is air, which enters the compressor at 40°C at a rate of 700 m3/min and leaves the turbine at 650°C. Using variable specific heats for air and assuming a compressor isentropic efficiency of 85 percent and a turbine isentropic efficiency of 88 percent, determine (a) the net power output, (b) the back work ratio, and (c) the thermal efficiency.