Discussion
Which one of the following makes an ideal air-standard Stirling cycle?
Answer: C
The ideal Stirling cycle is two reversible isotherms and two reversible isochores.
The working gas is compressed isothermally at the low temperature, heated at constant volume, expanded isothermally at the high temperature and cooled at constant volume. With an ideal regenerator, the heat given up in the constant-volume cooling is stored and returned in the constant-volume heating, so the cycle reaches the Carnot efficiency.
Two isobars and two adiabatics make the Brayton (Joule) cycle. Two isotherms and two isobars make the Ericsson cycle. Isentropic compression, constant-volume heat addition, isentropic expansion and constant-volume heat rejection describe the Otto cycle.
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