Finite Physical Dimensions Thermodynamics Analysis and Design of Closed Irreversible Cycles

Gheorghe Dumitrașcu, Michel Feidt and Ştefan Grigorean
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Gheorghe Dumitrașcu: Mechanical Engineering Faculty, “Gheorghe ASACHI” Technical University of Iasi, 700050 Iasi, Romania
Michel Feidt: Laboratoire d’Énergétique et de Mécanique Théorique et Appliquée, UMR 7563, Université de Lorraine, 54505 Vandoeuvre-lès-Nancy, France
Ştefan Grigorean: Mechanical Engineering Faculty, “Gheorghe ASACHI” Technical University of Iasi, 700050 Iasi, Romania

Energies, 2021, vol. 14, issue 12, 1-19

Abstract: This paper develops simplifying entropic models of irreversible closed cycles. The entropic models involve the irreversible connections between external and internal main operational parameters with finite physical dimensions. The external parameters are the mean temperatures of external heat reservoirs, the heat transfers thermal conductance, and the heat transfer mean log temperatures differences. The internal involved parameters are the reference entropy of the cycle and the internal irreversibility number. The cycle’s design might use four possible operational constraints in order to find out the reference entropy. The internal irreversibility number allows the evaluation of the reversible heat output function of the reversible heat input. Thus the cycle entropy balance equation to design the trigeneration cycles only through external operational parameters might be involved. In designing trigeneration systems, they must know the requirements of all consumers of the useful energies delivered by the trigeneration system. The conclusions emphasize the complexity in designing and/or optimizing the irreversible trigeneration systems.

Keywords: closed irreversible cycles; number of internal irreversibility; reference entropy; operational constraints; irreversible energy efficiency; trigeneration (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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