The A 5000 kW gas-turbine power plant operates with a low-pressure compressor and a high-pressure one with intercooling stage between them. The overall pressure ratio is 9. A high-pressure turbine is used to drive the compressor, and a low-pressure one drives the electrical generator. temperature of the gases at entry to the high-pressure turbine is 750 C, and the gases are reheated to 750 C after expansion in the first turbine. The exhaust gases leaving the low-pressure turbine are passed through a heat exchanger to heat the air leaving the high-pressure compressor. The intercooler is ideal, and the air inlet temperature to the unit is 27 C. The isentropic efficiency of each compressor is 0.85 and that of each turbine is 0.87. The heat exchanger thermal ratio is 0.75. A mechanical efficiency of 0.95 may be assumed for both the power shaft and the compressor-turbine shaft. For air; cp=1.005 kJ/kg K and y = 1.4, and for products of combustion; Cp = 1.15 kJ/kg K and y= 1.333. Neglecting the effect of fuel mass, determine the mass flow rate of the air and the thermal efficiency of the cycle