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The substitution of R134a with R744: / Ciro, Aprea in International journal of refrigeration, Vol. 36 N° 8 (Décembre 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 8 (Décembre 2013) . - pp. 2148–2159 Titre : The substitution of R134a with R744: : an exergetic analysis based on experimental data Titre original : Le remplacement du R134a par le R744: une analyse exergétique basée sur des données expérimentales Type de document : texte imprimé Auteurs : Ciro, Aprea, Auteur ; Adriana Greco, Auteur ; Angelo Maiorino, Auteur Année de publication : 2014 Article en page(s) : pp. 2148–2159 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : CO2;  R134a;  transcritical  cycle;  exergetic  analysis;  exergy  loss Résumé : This paper deals with the problem of R314a substitution with a natural refrigerant fluid. A comparison is performed between R134a and R744 (CO2). R134a is a hydrofluorocarbon with a large direct warming impact (GWP), whereas the R744 contribution is negligible. A comparative exergetic analysis, carried out with experimental tests, has been presented. This paper compares a commercial R134a refrigeration plant and a prototype R744 system working in a trans-critical cycle. Based on the experimental data an exergetic analysis has been carried out on the overall plant and on each device. The overall exergetic performances of the classical vapour compression plant working with R134a are consistently better than that of R744 (from a minimum of 20 to a maximum of 44%). The performance of the individual components of the plant has been analyzed, in order to pinpoint those contributing most to the decrease in the exergetic performance of R744. En ligne : http://www.sciencedirect.com/science/article/pii/S014070071300159X [article] The substitution of R134a with R744: = Le remplacement du R134a par le R744: une analyse exergétique basée sur des données expérimentales : an exergetic analysis based on experimental data [texte imprimé] / Ciro, Aprea, Auteur ; Adriana Greco, Auteur ; Angelo Maiorino, Auteur . - 2014 . - pp. 2148–2159. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 8 (Décembre 2013) . - pp. 2148–2159 Mots-clés : CO2;  R134a;  transcritical  cycle;  exergetic  analysis;  exergy  loss Résumé : This paper deals with the problem of R314a substitution with a natural refrigerant fluid. A comparison is performed between R134a and R744 (CO2). R134a is a hydrofluorocarbon with a large direct warming impact (GWP), whereas the R744 contribution is negligible. A comparative exergetic analysis, carried out with experimental tests, has been presented. This paper compares a commercial R134a refrigeration plant and a prototype R744 system working in a trans-critical cycle. Based on the experimental data an exergetic analysis has been carried out on the overall plant and on each device. The overall exergetic performances of the classical vapour compression plant working with R134a are consistently better than that of R744 (from a minimum of 20 to a maximum of 44%). The performance of the individual components of the plant has been analyzed, in order to pinpoint those contributing most to the decrease in the exergetic performance of R744. En ligne : http://www.sciencedirect.com/science/article/pii/S014070071300159X