At the beginning of the compression process of an air-standard dual cycle with a compression ratio of 18, the temperature is 300 k and the pressure is 0.1 mpa. the pressure ratio for the constant volume part of the heating process is 1.5:1. the volume ratio for the constant pressure part of the heating process is 1.2:1. determine (a) the thermal efficiency and (b) the mean effective pressure, in mpa.
