Air is compressed from 23 C to 100 kPa to 500 kPa in a gas turbine. The air is heated to 520 C in the regenerator and then to 1200 C before entering the turbine. The isentropic efficiency is 100% for both the compressor and turbine. Please draw and label the T-s diagram, determine the regenerator effectiveness, the cycle thermal efficiency and the back work ratio.