A Systematic Approach to Exergy Efficiency of Steady-Flow Systems

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dc.contributor.authorCengel, Yunus A.
dc.contributor.authorKanoglu, Mehmet
dc.date.accessioned2026-01-24T12:29:30Z
dc.date.available2026-01-24T12:29:30Z
dc.date.issued2025
dc.departmentAlanya Alaaddin Keykubat Üniversitesi
dc.description.abstractExergy efficiency is a measure of thermodynamic perfection. A device that operates reversibly has an exergy efficiency of 100 percent and is said to be thermodynamically perfect. A reversible process involves zero entropy generation and thus zero exergy destruction since Xdestroyed = T0Sgen. Exergy efficiency is generally defined as the ratio of exergy output to exergy input eta ex = Xoutput/Xinput = 1 - (Xdestroyed + Xloss)/Xinput or the ratio of exergy recovered to exergy expended eta ex = Xrecovered/Xexpended = 1 - Xdestroyed/Xexpended. In this paper, exergy efficiency relations are obtained first for a general steady-flow system using both approaches. Then, explicit general relations are obtained for common steady-flow devices, such as turbines, compressors, pumps, nozzles, diffusers, valves and heat exchangers, as well as heat engines, refrigerators, and heat pumps. For power and refrigeration cycles, five different forms of exergy efficiency relations are developed, and their equivalence is demonstrated. With the unified approach presented here and the insights provided, the controversy and confusion associated with different exergy efficiency definitions are largely alleviated.
dc.identifier.doi10.3390/e27111108
dc.identifier.issn1099-4300
dc.identifier.issue11
dc.identifier.pmid41294951
dc.identifier.scopus2-s2.0-105023678881
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.3390/e27111108
dc.identifier.urihttps://hdl.handle.net/20.500.12868/5416
dc.identifier.volume27
dc.identifier.wosWOS:001623608700001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoen
dc.publisherMdpi
dc.relation.ispartofEntropy
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20260121
dc.subjectthermodynamics
dc.subjectexergy
dc.subjectexergy efficiency
dc.subjectsecond-law efficiency
dc.subjectexergy analysis
dc.subjectsteady-flow devices
dc.subjectheat engines
dc.subjectrefrigerators
dc.titleA Systematic Approach to Exergy Efficiency of Steady-Flow Systems
dc.typeArticle

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