Question: A four-stroke, 2.8 liter compression ignition engine operates on the dual cycle as shown in Fig.1 with a compression ratio of 14. The air at

A four-stroke, 2.8 liter compression ignition engine operates on the dual cycle as shown in Fig.1 with a compression ratio of 14. The air at the beginning of the compression process is at 95 kPa and 55°C and the engine speed is 3500 rev/min. Equal amounts of heat is supplied at constant volume and at constant pressure heat addition processes. The maximum allowable pressure in the cycle is 9 MPa. Assume that compression and expansion processes are adiabatic and consider the changes of specific heats of the air with temperature. Determine (a) the maximum temperature in the cycle, (b) network output, (c) thermal efficiency, (d) mean effective pressure,(e) net power output, (f) second-law efficiency of the cycle and (g) the rate of energy the exhaust gases.

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