A Comparative Assessment of Biodiesel Cetane Number Predictive Correlations Based on Fatty Acid Composition

Sixteen biodiesel cetane number (CN) predictive models developed since the early 1980s have been gathered and compared in order to assess their predictive capability, strengths and shortcomings. All are based on the fatty acid (FA) composition and/or the various metrics derived directly from it, nam...

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Bibliographic Details
Published in:Energies (Basel) 2019-01, Vol.12 (3), p.422
Main Authors: Giakoumis, Evangelos, Sarakatsanis, Christos
Format: Article
Language:English
Subjects:
biodiesel
Biodiesel fuels
Biofuels
Cetane number
chain length
coefficient of determination
degree of unsaturation
Fatty acid composition
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Summary:Sixteen biodiesel cetane number (CN) predictive models developed since the early 1980s have been gathered and compared in order to assess their predictive capability, strengths and shortcomings. All are based on the fatty acid (FA) composition and/or the various metrics derived directly from it, namely, the degree of unsaturation, molecular weight, number of double bonds and chain length. The models were evaluated against a broad set of experimental data from the literature comprising 50 series of measured CNs and FA compositions. It was found that models based purely on compositional structure manifest the best predictive capability in the form of coefficient of determination R2. On the other hand, more complex models incorporating the effects of molecular weight, degree of unsaturation and chain length, although reliable in their predictions, exhibit lower accuracy. Average and maximum errors from each model’s predictions were also computed and assessed.
ISSN:1996-1073
1996-1073
DOI:10.3390/en12030422