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On the thermal efficiency of power cycles in finite time thermodynamics

Momeni, F ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1088/0143-0807/37/5/055101
  3. Publisher: Institute of Physics Publishing , 2016
  4. Abstract:
  5. The Carnot, Diesel, Otto, and Brayton power cycles are reconsidered endoreversibly in finite time thermodynamics (FTT). In particular, the thermal efficiency of these standard power cycles is compared to the well-known results in classical thermodynamics. The present analysis based on FTT modelling shows that a reduction in both the maximum and minimum temperatures of the cycle causes the thermal efficiency to increase. This is antithetical to the existing trend in the classical references. Under the assumption of endoreversibility, the relation between the efficiencies is also changed to ηCarnot > ηBrayton > ηDiesel > ηOtto, which is again very different from the corresponding classical results. The present results benefit a better understanding of the important role of irreversibility on heat engines in classical thermodynamics
  6. Keywords:
  7. ٍٍEndoreversible ; Efficiency ; Heat engines ; Brayton power cycle ; Classical thermodynamics ; Endoreversibility ; Endoreversible ; Finite time thermodynamics ; Maximum and minimum temperatures ; Power cycle ; Thermal efficiency ; Thermodynamics
  8. Source: European Journal of Physics ; Volume 37, Issue 5 , 2016 ; 01430807 (ISSN)
  9. URL: http://iopscience.iop.org/article/10.1088/0143-0807/37/5/055101/meta;jsessionid=ACA85E8527657F97B98B5E5A92AF5F94.c3.iopscience.cld.iop.org