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Standard molar chemical exergy: A new accurate model

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  • Gharagheizi, Farhad
  • Ilani-Kashkouli, Poorandokht
  • Hedden, Ronald C.

Abstract

One of the key challenges in exergy analysis is computation of the standard molar chemical exergies of the compounds involved in the process or system. Here, we present a new, data-driven model for computation of the standard molar chemical exergies of pure organic compounds composed of C, H, N, O, S, F, Cl, Br, I and Si. The model is obtained by considering the formation of a pure organic compound from its constituent elements. The compound's standard molar chemical exergy is related to its standard state enthalpy and entropy of formation, and to the standard molar chemical exergies of its constituent elements. A database of 3148 pure organic compounds is used to develop correlations for the enthalpy and entropy of formation of an arbitrary organic compound based on a group contribution approach. Using these correlations, the standard molar chemical exergy of a given organic compound can be computed from our model. Comparison of model predictions with experimental data for 3148 compounds produces an average absolute relative deviation of only 0.3%. The new model provides a reasonable basis to estimate the standard molar chemical exergies of various organic compounds when experimental data are not available.

Suggested Citation

  • Gharagheizi, Farhad & Ilani-Kashkouli, Poorandokht & Hedden, Ronald C., 2018. "Standard molar chemical exergy: A new accurate model," Energy, Elsevier, vol. 158(C), pages 924-935.
    • Handle: RePEc:eee:energy:v:158:y:2018:i:c:p:924-935
    DOI: 10.1016/j.energy.2018.05.186
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    References listed on IDEAS

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    1. Gharagheizi, Farhad & Ilani-Kashkouli, Poorandokht & Mohammadi, Amir H. & Ramjugernath, Deresh, 2014. "A group contribution method for determination of the standard molar chemical exergy of organic compounds," Energy, Elsevier, vol. 70(C), pages 288-297.
    2. Bilgen, Selçuk & Kaygusuz, Kamil, 2008. "The calculation of the chemical exergies of coal-based fuels by using the higher heating values," Applied Energy, Elsevier, vol. 85(8), pages 776-785, August.
    3. Song, Guohui & Xiao, Jun & Zhao, Hao & Shen, Laihong, 2012. "A unified correlation for estimating specific chemical exergy of solid and liquid fuels," Energy, Elsevier, vol. 40(1), pages 164-173.
    4. Stepanov, V.S., 1995. "Chemical energies and exergies of fuels," Energy, Elsevier, vol. 20(3), pages 235-242.
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