Air Standard Cycles Air standard cycles are idealized cycles based on the following approximations: >A fixed amount of air modeled as an ideal gas is the working fluid. >The combustion process is replaced by a heat transfer from an external source. There are no exhaust and intake processes as in an actual engine. The cycle is completed by a constant-volume heat transfer process taking place while the piston is at the bottom dead center position. >All processes are internally reversible. Cold air-standard analysis >The specific heats are assumed constant at their ambient temperature values. 上游气通大学 Monday,May 08,2017 3 SHANGHAI JLAO TONG UNIVERSITYMonday, May 08, 2017 3 Air Standard Cycles Air standard cycles are idealized cycles based on the following approximations: A fixed amount of air modeled as an ideal gas is the working fluid. The combustion process is replaced by a heat transfer from an external source. There are no exhaust and intake processes as in an actual engine. The cycle is completed by a constant-volume heat transfer process taking place while the piston is at the bottom dead center position. All processes are internally reversible. Cold air-standard analysis The specific heats are assumed constant at their ambient temperature values