NDLI: Analysis and Optimization of Exergy Flows inside a Transcritical $CO_{2}$ Ejector for Refrigeration, Air Conditioning and Heat Pump Cycles

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Analysis and Optimization of Exergy Flows inside a Transcritical $CO_{2}$ Ejector for Refrigeration, Air Conditioning and Heat Pump Cycles

Content Provider	Directory of Open Access Journals (DOAJ)
Author	Sahar Taslimi Taleghani Mikhail Sorin Sébastien Poncet
Abstract	In this study, the exergy analysis of a $CO_{2}$ (R744) two-phase ejector was performed using a 1D model for both single and double choking conditions. The impact of the back pressure on the exergy destruction and exergy efficiencies was presented to evaluate the exergy performance under different working conditions. The results of two exergy performance criteria (transiting exergy efficiency and Grassmann exergy efficiency) were compared for three modes of an ejector functioning: Double choking, single choking and at the critical point. The behavior of three thermodynamic metrics: Exergy produced, exergy consumed and exergy destruction were evaluated. An important result concerning the ejector’s design was the presence of a maximum value of transiting exergy efficiency around the critical point. The impact of the gas cooler and evaporator pressure variations on the different types of exergy, the irreversibilities and the ejector global performance were investigated for a transcritical $CO_{2}$ ejector system. It was also shown that the transiting exergy flow had an important effect on the exergy analysis of the system and the Grassmann exergy efficiency was not an appropriate criterion to evaluate a transcritical $CO_{2}$ ejector performance.
e-ISSN	19961073
DOI	10.3390/en12091686
Journal	Energies
Issue Number	9
Volume Number	12
Language	English
Publisher	MDPI AG
Publisher Date	2019-05-01
Publisher Place	Switzerland
Access Restriction	Open
Subject Keyword	Technology Two-phase Ejector $co_{2}$ Transcritical System Exergy Analysis Irreversibility Transiting Exergy
Content Type	Text
Resource Type	Article

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