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Exergy analysis of industrial processes

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  • van Gool, Willem

Abstract

The usefulness of the exergy concept for the analysis of industrial processes is illustrated in literature in detail. Still the use of exergy analysis meets much resistance in industrial engineering departments. Reasons for this resistance might be the fact that exergy analysis is often presented as the consequence of the second law in thermodynamics and that exergy loss in a process is related to entropy differences between in- and outputs of the process. Both second law and entropy are often not used explicitly in the design of processes. A theoretical approach is outlined leading directly from the basic equations of thermodynamics to the analysis of complicated irreversible processes. The use of steady state processes is fundamental for the analysis. Complicated processes are aggregated into a limited number of irreversible unit operations connected by thermodynamically defined flows. Flows are described as originating from or going to reservoirs. Thermodynamic analysis is performed by just using changes in the reservoirs. The essential aspects are obtained directly in this approach, for example, exergy losses in the unit operations. Exergy efficiencies can be determined only if the proper environmental reference system is used. The major difference between exergy analysis and the usual engineering approach is not with respect to the use of the second law, but with the use of different reference states for calculating values of thermodynamic functions. It is suggested to drop the term second law analysis and to use exergy analysis in stead.

Suggested Citation

  • van Gool, Willem, 1992. "Exergy analysis of industrial processes," Energy, Elsevier, vol. 17(8), pages 791-803.
    • Handle: RePEc:eee:energy:v:17:y:1992:i:8:p:791-803
    DOI: 10.1016/0360-5442(92)90123-H
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    1. van Gool, W., 1987. "The value of energy carriers," Energy, Elsevier, vol. 12(6), pages 509-518.
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    Cited by:

    1. Costa, Márcio Macedo & Schaeffer, Roberto & Worrell, Ernst, 2001. "Exergy accounting of energy and materials flows in steel production systems," Energy, Elsevier, vol. 26(4), pages 363-384.
    2. Coban, Kahraman & Şöhret, Yasin & Colpan, C. Ozgur & Karakoç, T. Hikmet, 2017. "Exergetic and exergoeconomic assessment of a small-scale turbojet fuelled with biodiesel," Energy, Elsevier, vol. 140(P2), pages 1358-1367.
    3. Hammond, Geoffrey P., 2009. "Industrial energy analysis, thermodynamics and sustainability," Applied Energy, Elsevier, vol. 84(7-8), pages 675-700, July.
    4. Şöhret, Yasin & Dinç, Ali & Karakoç, T. Hikmet, 2015. "Exergy analysis of a turbofan engine for an unmanned aerial vehicle during a surveillance mission," Energy, Elsevier, vol. 93(P1), pages 716-729.
    5. Şöhret, Yasin & Açıkkalp, Emin & Hepbasli, Arif & Karakoc, T. Hikmet, 2015. "Advanced exergy analysis of an aircraft gas turbine engine: Splitting exergy destructions into parts," Energy, Elsevier, vol. 90(P2), pages 1219-1228.
    6. Hammond, Geoffrey P. & Mansell, Ross V.M., 2018. "A comparative thermodynamic evaluation of bioethanol processing from wheat straw," Applied Energy, Elsevier, vol. 224(C), pages 136-146.
    7. Hammond, Geoffrey P. & Owen, Rachel E. & Rathbone, Richard R., 2020. "Indicative energy technology assessment of hydrogen processing from biogenic municipal waste," Applied Energy, Elsevier, vol. 274(C).
    8. Geoffrey P. Hammond & Adrian B. Winnett, 2009. "The Influence of Thermodynamic Ideas on Ecological Economics: An Interdisciplinary Critique," Sustainability, MDPI, vol. 1(4), pages 1-31, December.
    9. Bühler, Fabian & Nguyen, Tuong-Van & Jensen, Jonas Kjær & Holm, Fridolin Müller & Elmegaard, Brian, 2018. "Energy, exergy and advanced exergy analysis of a milk processing factory," Energy, Elsevier, vol. 162(C), pages 576-592.
    10. Wiesberg, Igor Lapenda & Brigagão, George Victor & Araújo, Ofélia de Queiroz F. & de Medeiros, José Luiz, 2019. "Carbon dioxide management via exergy-based sustainability assessment: Carbon Capture and Storage versus conversion to methanol," Renewable and Sustainable Energy Reviews, Elsevier, vol. 112(C), pages 720-732.

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