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Second-law analysis of the reforming-controlled compression ignition

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  • Eyal, Amnon
  • Tartakovsky, Leonid

Abstract

This paper presents the optimization of energy conversion in a novel reforming-controlled compression ignition system, combining the benefits of low-temperature combustion with high-pressure thermochemical recuperation (mostly from the perspective of the second law of thermodynamics). Further, new insights into ways of improving efficiency are provided. A promising renewable fuel dimethyl ether is analyzed for the first time as a primary fuel. A comprehensive analysis of various factors influencing exergy destruction in the reforming-controlled compression ignition system in their complex interdependence is also performed for the first time. Exergy mapping results show that approximately 33% of the exergy supplied to the system is destroyed owing to irreversible processes in the cylinder itself, and approximately 5% is destroyed in the reforming system (intercooler, vaporizer, and reformer). The reformer is the main source of exergy destruction in the reforming system. Approximately 45% and 38% of the engine exergy destruction is related to chemical reaction and in-cylinder-walls heat interaction, respectively. The results indicate that the efficiency improvement due to second-law optimization reaches up to 7.1%, and if the compression ratio is increased to 18:1 instead of 16:1, this reaches up to 9.2%. The higher improvement is achieved at the highest loads.

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  • Eyal, Amnon & Tartakovsky, Leonid, 2020. "Second-law analysis of the reforming-controlled compression ignition," Applied Energy, Elsevier, vol. 263(C).
    • Handle: RePEc:eee:appene:v:263:y:2020:i:c:s0306261920301343
    DOI: 10.1016/j.apenergy.2020.114622
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    References listed on IDEAS

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    2. Rudolph, Charlotte & Atakan, Burak, 2021. "Investigation of natural gas/hydrogen mixtures for exergy storage in a piston engine," Energy, Elsevier, vol. 218(C).
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    4. David Diskin & Leonid Tartakovsky, 2020. "Efficiency at Maximum Power of the Low-Dissipation Hybrid Electrochemical–Otto Cycle," Energies, MDPI, vol. 13(15), pages 1-10, August.
    5. David Emberson & Judit Sandquist & Terese Løvås & Alessandro Schönborn & Inge Saanum, 2021. "Varying Ignition Quality of a Fuel for a HCCI Engine Using a Photochemically-Controlled Additive: The Development of a ‘Smart’ Fuel," Energies, MDPI, vol. 14(5), pages 1-17, March.

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