An air standard Otto cycle has a compression ratio of 9.5. At the beginning of the isentropic compression the working fluid, air, is at an initial pressure, temperature and volume of P1 = 100 kPa, T1 = 35 oC and V1 = 600 cm3. The temperature at the end of the isentropic expansion is T4 = 527 oC. Assume Cp = 1.005 kJ/kgK & Cv = 0.718 kJ/kgK , R = 0.287 kJ/kg K and k = 1.4 for the air. Sketch the Pv and Ts diagrams for the cycle and determine:
The temperature and pressure, at the beginning of the isentropic expansion: P3 & T3
The heat transferred into the working fluid during the heat addition process: Q2-3
The work done by the air during the isentropic expansion: W3-4
The work done on the air during the isentropic compression: W1-2
The thermal efficiency of the engine: ?