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SCIENCE CHINA Technological Sciences, Volume 60 , Issue 5 : 692-700(2017) https://doi.org/10.1007/s11431-016-0720-x

Analyses of thermodynamic performance for the endoreversible Otto cycle with the concepts of entropy generation and entransy

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  • ReceivedSep 28, 2016
  • AcceptedDec 12, 2016
  • PublishedMar 30, 2017

Abstract

In this paper, the endoreversible Otto cycle is analyzed with the entropy generation minimization and the entransy theory. The output power and the heat-work conversion efficiency are taken as the optimization objectives, and the relationships of the output power, the heat-work conversion efficiency, the entropy generation rate, the entropy generation numbers, the entransy loss rate, the entransy loss coefficient, the entransy dissipation rate and the entransy variation rate associated with work are discussed. The applicability of the entropy generation minimization and the entransy theory to the analyses is also analyzed. It is found that smaller entropy generation rate does not always lead to larger output power, while smaller entropy generation numbers do not always lead to larger heat-work conversion efficiency, either. In our calculations, both larger entransy loss rate and larger entransy variation rate associated with work correspond to larger output power, while larger entransy loss coefficient results in larger heat-work conversion efficiency. It is also found that the concept of entransy dissipation is not always suitable for the analyses because it was developed for heat transfer.


Funded by

Youth Programs of Chongqing Three Gorges University(13QN18,the Scientific,Technological Research Program of Chongqing Municipal Education Commission (Grant No. KJ1501002)


Acknowledgment

This work was supported by the Scientific and Technological Research Program of Chongqing Municipal Education Commission (Grant No. KJ1710251).


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