Example 3 Brayton Cycles with Regeneration The 7FA gas turbine manufactured by General Electric is reported to have an efficiency of 35.9 percent and to produce 159 MW of net power in the simple-cycle mode. The pressure ratio is 14.7 and the turbine inlet temperature is 1288°C. The mass flow rate through the turbine is 1,536,000 kg/h. Taking the ambient temperature to be 20°C and using variable specific heats, determine: a) the isentropic efficiency of the turbine and the compressor, b) the thermal efficiency of this gas turbine if a regenerator with an effectiveness of 80 percent is added.