Second law efficiency of air-cooled refrigeration compressors

Arqam, Mohammad; Jahangiri, Amir; Mitchell, Mark; Bennett, Nick S.; Woodfield, Peter

doi:10.1016/j.pes.2024.100002

Second law efficiency of air-cooled refrigeration compressors

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Arqam, Mohammad, Jahangiri, Amir, Mitchell, Mark, Bennett, Nick S. and Woodfield, Peter (2024) Second law efficiency of air-cooled refrigeration compressors. Progress in Engineering Science, 1 (1). ISSN 2950-4252

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Abstract

Isentropic efficiency is a common performance measure for compressors and is useful for modelling the behaviour of real compressors in relation to discharge temperature or required mechanical power input. However, it has a weakness in that a basic assumption in the calculation is that the real compressor is adiabatic. If significant heat transfer from the compressor to the outside environment occurs, then the adiabatic assumption is invalid, but the negative effects of internal entropy generation are reduced, and in principle it is possible to have a measured isentropic ‘efficiency’ greater than 100%, which, while counterintuitive, is highly desirable. We practically demonstrate this effect with an air-cooled swashplate compressor and propose that for cases of intentional compressor cooling, the simple definition for isentropic efficiency is retained as a performance measure but renamed to isentropic performance coefficient (IPC).

Item Type:	Article
Additional Information:	Data Availability: Data will be made available on request.
Uncontrolled Keywords:	isentropic efficiency,refrigeration compressor performance,swashplate compressor,engineering (miscellaneous),civil and structural engineering,mechanical engineering,building and construction ,/dk/atira/pure/subjectarea/asjc/2200/2201
Faculty \ School:	Faculty of Science > School of Engineering, Mathematics and Physics
UEA Research Groups:	Faculty of Science > Research Groups > Fluids & Structures
Related URLs:	https://www.scopus.com/pages/publication...
Depositing User:	LivePure Connector
Date Deposited:	14 Aug 2026 14:46
Last Modified:	14 Aug 2026 14:46
URI:	https://ueaeprints.uea.ac.uk/id/eprint/104150
DOI:	10.1016/j.pes.2024.100002

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