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Performance evaluation of a two-stage CO2 cycle with gas injection in the cooling mode operation

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dc.contributor.authorCho, Honghyun-
dc.contributor.authorBaek, Changhyun-
dc.contributor.authorPark, Chasik-
dc.contributor.authorKim, Yongchan-
dc.date.accessioned2021-09-08T21:12:51Z-
dc.date.available2021-09-08T21:12:51Z-
dc.date.created2021-06-10-
dc.date.issued2009-01-
dc.identifier.issn0140-7007-
dc.identifier.urihttps://scholar.korea.ac.kr/handle/2021.sw.korea/120861-
dc.description.abstractThe cooling performance and reliability of a transcritical CO2 cycle can be significantly improved by using a multi-stage compressor with gas injection because the CO2 cycle has a large pressure difference across a compressor. The objective of this study is to investigate the performance and operating characteristics of a two-stage CO2 cycle with gas injection. in this study, the performances of a two-stage CO2 cycle with gas injection (called as "two-stage gas injection cycle") were measured as the amount of refrigerant charge, first- and second-stage compressor frequencies, and first- and second-stage EEV openings were varied in the cooling mode operation. The cooling COP of the two-stage gas injection cycle was maximally enhanced by 16.5% over that of the two-stage non-injection cycle in the experiments. In addition, when the first- and second-stage EEV openings were increased, the compression ratio decreased and this in turn, improved the cooling COP of the two-stage gas injection cycle. However, when the first-stage EEV opening was increased, the mass flow rate through the evaporator decreased, and this in turn, decreased the cooling capacity of the two-stage gas injection cycle. Therefore, in the two-stage gas injection cycle, an optimum control of both EEV openings is required. (C) 2008 Elsevier Ltd and IIR. All rights reserved.-
dc.languageEnglish-
dc.language.isoen-
dc.publisherELSEVIER SCI LTD-
dc.subjectCARBON-DIOXIDE CYCLE-
dc.subjectEXPANSION DEVICE-
dc.subjectHEAT-PUMP-
dc.subjectSYSTEM-DESIGN-
dc.subjectREFRIGERANT-
dc.titlePerformance evaluation of a two-stage CO2 cycle with gas injection in the cooling mode operation-
dc.typeArticle-
dc.contributor.affiliatedAuthorKim, Yongchan-
dc.identifier.doi10.1016/j.ijrefrig.2008.07.008-
dc.identifier.scopusid2-s2.0-56049111063-
dc.identifier.wosid000264917500005-
dc.identifier.bibliographicCitationINTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, v.32, no.1, pp.40 - 46-
dc.relation.isPartOfINTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID-
dc.citation.titleINTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID-
dc.citation.volume32-
dc.citation.number1-
dc.citation.startPage40-
dc.citation.endPage46-
dc.type.rimsART-
dc.type.docTypeArticle-
dc.description.journalClass1-
dc.description.journalRegisteredClassscie-
dc.description.journalRegisteredClassscopus-
dc.relation.journalResearchAreaThermodynamics-
dc.relation.journalResearchAreaEngineering-
dc.relation.journalWebOfScienceCategoryThermodynamics-
dc.relation.journalWebOfScienceCategoryEngineering, Mechanical-
dc.subject.keywordPlusCARBON-DIOXIDE CYCLE-
dc.subject.keywordPlusEXPANSION DEVICE-
dc.subject.keywordPlusHEAT-PUMP-
dc.subject.keywordPlusSYSTEM-DESIGN-
dc.subject.keywordPlusREFRIGERANT-
dc.subject.keywordAuthorRefrigeration system-
dc.subject.keywordAuthorCompression system-
dc.subject.keywordAuthorTwo-stage system-
dc.subject.keywordAuthorCarbon dioxide-
dc.subject.keywordAuthorTranscritical system-
dc.subject.keywordAuthorInjection-
dc.subject.keywordAuthorMeasurement-
dc.subject.keywordAuthorPerformance-
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