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Differentiating the Physical Optimum from the Exergetic Evaluation of a Methane Combustion Process

Author

Listed:
  • Lukas Kerpen

    (Department for Energy Systems and Infrastructures, Energy- and Resource-Efficient Systems, Fraunhofer Institute for Factory Operation and Automation, Sandtorstr. 22, 39106 Magdeburg, Germany)

  • Achim Schmidt

    (Department of Mechanical Engineering and Production Management, Faculty of Engineering and Computer Science, Hamburg University of Applied Sciences, Berliner Tor 11, 20099 Hamburg, Germany)

  • Bernd Sankol

    (Department of Mechanical Engineering and Production Management, Faculty of Engineering and Computer Science, Hamburg University of Applied Sciences, Berliner Tor 11, 20099 Hamburg, Germany)

Abstract

Combustion processes continue to be essential for the energy supply sector. A reliable energetic evaluation of these processes is crucial, particularly since the pollutants resulting from combustion have a significant impact on global warming. This work evaluates a combustion using the exergetic evaluation and the Physical Optimum (PhO) as it is described in VDI-Guideline 4663. Differences between PhO and exergy are investigated, allowing a distinct differentiation and examining the PhO’s added value in combustion analysis. Based on the evaluation of a simulated methane combustion, this paper shows that the PhO-Factor may be used to evaluate combustion processes. However, it shows that the PhO of a combustion process is a simplification of this fuels exergy and does not provide advantages to the exergy evaluation. Nevertheless, an adaption of the PhO is not carried out in the context of this work since the minimal deviation of the simulated energy indicators currently cannot justify an adaptation. In addition, proposed adjustments of the reference value (PhO) could lead to the definition limits of the PhO-Factor being exceeded. The paper introduces the indirect PhO-Factor for a targeted process optimization. It is shown that in this case, the indirect PhO-Factor closely corresponds to the exergy efficiency.

Suggested Citation

  • Lukas Kerpen & Achim Schmidt & Bernd Sankol, 2021. "Differentiating the Physical Optimum from the Exergetic Evaluation of a Methane Combustion Process," Energies, MDPI, vol. 14(12), pages 1-17, June.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:12:p:3419-:d:572106
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    References listed on IDEAS

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    Cited by:

    1. Dirk Volta & Samanta A. Weber, 2021. "The Physical Optimum as an Ideal Reference Value for Balancing Thermodynamic Processes Integrating the Exergetic Evaluation by the Example of Heat Supply," Energies, MDPI, vol. 14(15), pages 1-15, July.
    2. Samanta A. Weber & Dirk Volta & Jürgen Kuck, 2022. "Comparison of the Energetic Efficiency of Gas Separation Technologies Using the Physical Optimum by the Example of Oxygen Supply Options," Energies, MDPI, vol. 15(5), pages 1-22, March.

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