Document IIF
Evaluation de la performance d'un cycle biétagé au CO2 à injection intermédiaire lors du fonctionnement en mode refroidissement.
Performance evaluation of a two-stage CO2 cycle with gas injection in the cooling mode operation.
Résumé
The 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.
Documents disponibles
Format PDF
Pages : 40-46
Disponible
Prix public
20 €
Prix membre*
Gratuit
* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)
Détails
- Titre original : Performance evaluation of a two-stage CO2 cycle with gas injection in the cooling mode operation.
- Identifiant de la fiche : 2009-0103
- Langues : Anglais
- Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 32 - n. 1
- Date d'édition : 01/2009
Liens
Voir d'autres articles du même numéro (16)
Voir la source
Indexation
-
Thèmes :
Systèmes à compression;
CO2 - Mots-clés : Système frigorifique; Mesure; Système biétage; Système à compression; Performance; Injection; Cycle transcritique; Frigorigène; CO2
-
Performance comparison of transcritical CO2 sin...
- Auteurs : WANG H., MA Y., LI M., et al.
- Date : 07/09/2008
- Langues : Anglais
- Source : 8th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2008)
- Formats : PDF
Voir la fiche
-
Experimental results and evaluation of 2-stage ...
- Auteurs : IMAI S., ITSUKI H., OTAKE M., et al.
- Date : 02/05/2005
- Langues : Anglais
- Source : 8th IEA Heat Pump Conference 2005: global advances in heat pump technology, applications, and markets. Conference proceedings [CD-ROM].
Voir la fiche
-
Performance and characteristics of compressor/e...
- Auteurs : FUKUTA M., YANAGISAWA T., NAKAYA S., et al.
- Date : 29/05/2006
- Langues : Anglais
- Source : 7th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2006). Proceedings
- Formats : PDF
Voir la fiche
-
Reintroduction of carbon dioxide into the refri...
- Auteurs : MILOVANOV V., WOBST E.
- Date : 27/09/2006
- Langues : Anglais
- Source : Compressors 2006: 6th International Conference on Compressors and Coolants
- Formats : PDF
Voir la fiche
-
Thermodynamic analysis of different two-stage t...
- Auteurs : CECCHINATO L., CORRADI M., FORNASIERI E., et al.
- Date : 02/08/2005
- Langues : Anglais
- Source : Commercial Refrigeration. Thermophysical Properties and Transfer Processes of Refrigerants. Proceedings of the IIR International Conferences.
- Formats : PDF
Voir la fiche