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A more general exergy function and its application to the definition of exergy efficiency

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  • Zanchini, Enzo

Abstract

An availability function which includes the usual functions exergy and flow exergy as special cases is defined and called exergy. The new definition of exergy is based on the concept of pressure energy, namely the work that must be done on a stationary external pressure field to build inside it the region of space occupied by the system. Then, the definition of exergy efficiency is written in a more explicit form, where the same availability function is employed for both steady-flow processes and non-flow processes.

Suggested Citation

  • Zanchini, Enzo, 2015. "A more general exergy function and its application to the definition of exergy efficiency," Energy, Elsevier, vol. 87(C), pages 352-360.
    • Handle: RePEc:eee:energy:v:87:y:2015:i:c:p:352-360
    DOI: 10.1016/j.energy.2015.04.111
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    References listed on IDEAS

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    1. Lior, Noam & Zhang, Na, 2007. "Energy, exergy, and Second Law performance criteria," Energy, Elsevier, vol. 32(4), pages 281-296.
    2. Zanchini, Enzo & Terlizzese, Tiziano, 2009. "Molar exergy and flow exergy of pure chemical fuels," Energy, Elsevier, vol. 34(9), pages 1246-1259.
    3. Nguyen, Tuong-Van & Voldsund, Mari & Elmegaard, Brian & Ertesvåg, Ivar Ståle & Kjelstrup, Signe, 2014. "On the definition of exergy efficiencies for petroleum systems: Application to offshore oil and gas processing," Energy, Elsevier, vol. 73(C), pages 264-281.
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    1. Mohammed Khennich & Mikhail Sorin & Nicolas Galanis, 2016. "Exergy Flows inside a One Phase Ejector for Refrigeration Systems," Energies, MDPI, vol. 9(3), pages 1-10, March.
    2. Sun, Wenqiang & Zhang, Fengyuan, 2016. "Design and thermodynamic analysis of a flash power system driven by process heat of continuous casting grade steel billet," Energy, Elsevier, vol. 116(P1), pages 94-101.

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