A gas-turbine power plant operates on the simple Brayton cycle between the pressure limits of 100 and

Question:

A gas-turbine power plant operates on the simple Brayton cycle between the pressure limits of 100 and 1600 kPa. The working fluid is air, which enters the compressor at 408C at a rate of 850 m3/min and leaves the turbine at 6508C. Using variable specific heats for air and assuming a compressor isentropic efficiency of 85 percent and a turbine isentropic efficiency of 88 percent, determie
(a) The net power output,
(b) The back work ratio, and
(c) The thermal efficiency.