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Identification of factors affecting exergy destruction and engine efficiency of various classes of fuel

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  • Liu, Daojian
  • Wang, Hu
  • Liu, Haifeng
  • Zheng, Zunqing
  • Zhang, Yan
  • Yao, Mingfa

Abstract

The fuels of internal combustion (IC) engines are gradually becoming diverse. However, differences in physicochemical properties among fuels result in different efficiency potentials. In this work, the factors affecting exergy destruction and engine efficiency of various classes of fuel were identified based on the first- and second-law of thermodynamics. The results demonstrate that exergy destruction fraction (fEx_D) shows strongly positive correlation to the ratio of fuel chemical exergy (LExV) to lower heating value (LHV) (ε) and dimensionless entropy change (αS), and the first-law efficiency has strongly positive correlation to the product ratio of specific-heat during combustion (γc). Specifically, small molecule fuels have lower first-law efficiency than large ones, while the second-law efficiency of hydrocarbons are higher than that of oxygenates due to their lower exergy destruction losses. However, the lower exergy destruction does not always lead to improved second-law efficiency, but increased exhaust exergy. With increasing air or EGR dilution, both the first- and second-law efficiency increase, but the increased exergy destruction results in the reduced exhaust exergy. As a result, it is more important and reasonable to design or reform fuel for increasing the thermal efficiency, rather than reducing the exergy destruction of IC engines.

Suggested Citation

  • Liu, Daojian & Wang, Hu & Liu, Haifeng & Zheng, Zunqing & Zhang, Yan & Yao, Mingfa, 2020. "Identification of factors affecting exergy destruction and engine efficiency of various classes of fuel," Energy, Elsevier, vol. 211(C).
    • Handle: RePEc:eee:energy:v:211:y:2020:i:c:s0360544220320041
    DOI: 10.1016/j.energy.2020.118897
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    References listed on IDEAS

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    1. Gabrielius MEJERAS & Alfredas RIMKUS & Jonas MATIJOŠIUS, 2021. "Investigation Of The Influence Of Hydrogen On The Energy Performance Of A Spark Ignition Engine Using Gasoline And Bioethanol Fuel Mixtures," Transport Problems, Silesian University of Technology, Faculty of Transport, vol. 16(3), pages 41-51, September.
    2. Wei, Jianan & Liu, Haifeng & Zhu, Hongyan & Cai, Yuqing & Wang, Hu & Yao, Mingfa, 2023. "Energy analysis and optimization of iso-octane and n-heptane combustion process," Energy, Elsevier, vol. 262(PB).

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