Timeline for Please explain why the Carnot cycle is reversible while the Otto cycle is irreversible using the kelvin or clausius statement of the second law
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| May 9, 2023 at 7:13 | history | edited | Jakob KS | CC BY-SA 4.0 |
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| May 9, 2023 at 7:11 | comment | added | Jakob KS | Thanks @hyportnex and Chemomechanics for the clarifications. I see that my understanding of the subject may not be quite right. I'll add a link to the other Physics SE answer in the post. | |
| May 8, 2023 at 18:09 | comment | added | Chemomechanics | The reversible Otto cycle is discussed in this other Physics SE answer and shown schematically here, for instance, so I think the answer may be off the mark or may need clarification. The resolution to the discrepancy may involve the additional idealization of an infinite number of available thermal reservoirs; as already noted, multiple idealizations are necessary when conceiving of a reversible heat engine/pump cycle. | |
| May 8, 2023 at 12:21 | comment | added | hyportnex | You are confusing thermodynamic efficiency with reversibility. The Carnot cycle is reversible because at every step it is done reversibly not because the heat transfer is done isothermally. If its adiabatic stages were done irreversibly the cycle would be irreversible. Similarly, one can perform the Otto cycle (adiabatic-isochoric-adiabatic-isochoric + isobaric) reversibly if each step is reversible and we know that in principle it can be done that way. If that were not the case the conventional $p-V$ diagram representing the cycle could not even be drawn. | |
| May 8, 2023 at 9:25 | comment | added | xxx | Thank you very much for your answer. But would you please explain the reason for the reversibility of the Carnot cycle and irreversibility of the Otto cycle in terms of one of the statements (kelvin-planck or clausius) of the second law of thermodynamics? | |
| May 8, 2023 at 9:18 | history | answered | Jakob KS | CC BY-SA 4.0 |