ON A GENERAL STATEMENT FOR EFFICIENCY

In this paper the conditions to define the efficiency of a process as applicable within the first and the second laws of thermodynamics are investigated. The aim of the note is in the first place of finding out a generalized statement of the efficiency, yielding values ranging in principle between o...

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Bibliographic Details
Published in:Chemical engineering communications 1989-01, Vol.81 (1), p.177-195
Main Author: BISIO, GIACOMO
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Energy. Thermal use of fuels
entropy
Exact sciences and technology
Exergy efficiency
Losable exergy
Polytropic efficiency
production
Theoretical studies. Data and constants. Metering
Thermodynamics, mechanics etc. For energy applications
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Summary:In this paper the conditions to define the efficiency of a process as applicable within the first and the second laws of thermodynamics are investigated. The aim of the note is in the first place of finding out a generalized statement of the efficiency, yielding values ranging in principle between one (for no irreversibilities) and zero (for no useful effect), whereas a relative entropy production varies between zero and one. Various kinds of processes are then examined to show the validity and the limits of the above statement In dieser Arbeit wird versucht die Bedingungen festzustellen, die eine Definition des Wirkungsgrades eines Prozesses erlauben, unter Beriicksicktigung des 1. und des 2. Haupsatzes der Thermodynamik. Das Ziel der Arbeit ist es, zuerst eine solche Definition des Wirkungsgrades zu erhalten, sodass der Wirkungsgrad grundsatzlich zwischcn 1 (bei umkehrbarem Prozess) und 0 (bei keiner Nutzwirkung) liegt, wahrend eine entsprechende relative Entropieerzeugung zwischen 0 und 1 schwankt Danach werden verschiedene Prozesse examiniert, um die Gültigkeit und die Grenzen dieser Definition zu zeiten.
ISSN:0098-6445
1563-5201
DOI:10.1080/00986448908940538