A Brayton cycle using N 2 gas in a closed loop has the N 2 entering the compressor at 80 kPa and 15°C. The nitrogen exits the compressor at 600 kPa and enters the turbine at 1000 K. The cycle produces...

A Brayton cycle using N₂
gas in a closed loop has the N₂
entering the compressor at 80 kPa and 15°C. The nitrogen exits the compressor at 600 kPa and enters the turbine at 1000 K. The cycle produces a net power of 10 MW. The isentropic efficiency of both the compressor and the turbine is 0.78. Assume constant specific heats for the nitrogen. Determine the required mass flow rate and the thermal efficiency of the cycle. How would these values change if the gas used was CO₂?