The compression ratio of an ideal dual cycle is 14. Air is at 100 kPa and 300 K at the beginning of the compression process and at 2200 K at the end of the heat-addition process. Heat transfer to air takes place partly at constant volume and partly at constant pressure, and it amounts to 1520.4kJ/kg. Assuming variable specific heats for air, determine
(a) The fraction of heat transferred at constant volume.
(b) The thermal efficiency of the cycle.