Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kPa and 17oC. The system uses a regenerator as well as reheating and intercooling. The pressure ratio across each compressor is 4. 300 kJ/kg of heat are added to the air in each combustion chamber. The regenerator increases the temperature of the cold air by 20oC. Determine the thermal efficiency of the system assuming isentropic operations for all compressor and turbine stages and using constant specific heats at room temperature.