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Exergy analysis and performance improvement of a subcritical/supercritical organic Rankine cycle (ORC) for exhaust gas waste heat recovery in a biogas fuelled combined heat and power (CHP) engine through the use of regeneration

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Date

2019

Author

Koç, Yıldız
Yağlı, Hüseyin
Koç, Ali

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Citation

Koc, Y., Yaglı, H., Koc, A. (2019). Exergy analysis and performance improvement of a subcritical/supercritical organic Rankine cycle (ORC) for exhaust gas waste heat recovery in a biogas fuelled combined heat and power (CHP) engine through the use of regeneration. Energies, 12(4), 1-22. doi: 10.3390/en12040575

Abstract

In the present study, a subcritical and supercritical regenerative organic Rankine cycle (rORC) was designed. The designed rORCs assist a combined heat and power (CHP) engine, the fuel of which is biogas produced from anaerobic digestion of domestic wastes in Belgium. R245fa was selected as the working fluid for both the subcritical and supercritical rORC. During the parametric optimisation, the net power production, mass flow rate, exchanged heat in the regenerator, total pump power consumption, thermal and exergetic efficiencies of rORC were calculated for varying turbine inlet temperatures and pressures. After parametric optimisation of the rORC, the results were compared with the results of the previous study, in which only a simple ORC is analysed and parametrically optimised. Moreover, the effect of the regenerator was revealed by examining all results together. Finally, the exergetic analysis of the best performing subcritical and supercritical rORC was performed. Furthermore, the results of the present and previous studies were considered together and it is clearly seen that the subcritical rORC shows the best performance. Consequently, by using the subcritical rORC, the disadvantages of the using simple ORC (low performance) and supercritical cycle (safety, investment) can be eliminated and system performance can be improved.

Source

Energies

Volume

12

Issue

4

URI

https://doi.org/10.3390/en12040575
https://hdl.handle.net/20.500.12508/580

Collections

  • Araştırma Çıktıları | Scopus İndeksli Yayınlar Koleksiyonu [1067]
  • Araştırma Çıktıları | Web of Science İndeksli Yayınlar Koleksiyonu [1080]
  • Makale Koleksiyonu [159]



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