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- W2125152054 abstract "Some years ago Vignati (refs. 1, 2, 3) showed that, under some particular circumstances (inter alia : isobaric processes connected through internal heat exchangers), the eciency of an Ericsson cycle involving a real gas can exceed the Carnot limit ·C , in contradiction with the second principle of thermodynamics. However, the convergence of Vignati's algorithm, giving the temperature dierence between the intermediate heat exchangers, has not yet been proved. In particular, it isn't clear, if the number of intermediate heat exchangers infinitely increases, the condition of a total (perfect) heat recovery may be asymptotically approximated. This remark is relevant because the claimed anomalous eciencies appear only in the limit of a perfect heat recovery. Considering a suitable counterexample, we prove that, in general, the residual heat discharged on the external sources does not vanish in that limit, even when the isobars exchange the same amount of heat. Therefore the violation of the second law inferred from Vignati's calculation is merely apparent, being referred to a situation which is not (in principle) physically realisable. The essentials of the Vignati's argument are then applied to an Ericsson cycle involving an ideal gas undergoing chemical reactions. Again, no contradiction arises with the second principle. c" @default.
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- W2125152054 date "2006-02-01" @default.
- W2125152054 modified "2023-09-28" @default.
- W2125152054 title "Considerations About The Anomalous Efficiency Of Particular Thermodynamic Cycles" @default.
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