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Energetic evaluation of an internal heat exchanger in a CO2 transcritical refrigeration plant using experimental data / E. Torrella in International journal of refrigeration, Vol. 34 N° 1 (Janvier 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 40-49 Titre : Energetic evaluation of an internal heat exchanger in a CO2 transcritical refrigeration plant using experimental data Titre original : Evaluation énergétique de l’échangeur de chaleur interne d’une installation frigorifique transcritique au CO2 à l’aide de données expérimentales Type de document : texte imprimé Auteurs : E. Torrella, Auteur ; D. Sánchez, Auteur ; R. Llopis, Auteur Année de publication : 2011 Article en page(s) : pp. 40-49 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Refrigeration  system  Carbon  dioxide  Transcritical  cycle  Internal  heat  exchanger  Calculation  Efficiency-superheat Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The performance of an Internal Heat Exchanger (IHX) operating in a CO2 transcritical refrigeration plant is analysed, from an energetic point of view, in this work. The evaluation is based on experimental data by contrasting the performance of the plant working with (44 tests) and without the IHX (46 tests) at the same operating conditions. The experimental evaluation covers three evaporating levels (−5, −10 and −15 °C), at two different gas-cooler outlet temperatures each (31, 34 °C), for a wide range of gas-cooler operating pressures (74.5–105.9 bar). The thermal effectiveness of the IHX is empirically analysed for the different operating conditions in the first part of the paper. Moreover, the relation of its effectiveness with the operating parameters is presented. The second part is devoted to analyse the modification of the energetic performance of the plant caused by the IHX. The results show a maximum increment on cooling capacity of 12%, an increment of the efficiency of the plant up to 12% and a maximum increase on discharge temperature of 10 °C at −15 °C of evaporating temperature. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710001520 [article] Energetic evaluation of an internal heat exchanger in a CO2 transcritical refrigeration plant using experimental data = Evaluation énergétique de l’échangeur de chaleur interne d’une installation frigorifique transcritique au CO2 à l’aide de données expérimentales [texte imprimé] / E. Torrella, Auteur ; D. Sánchez, Auteur ; R. Llopis, Auteur . - 2011 . - pp. 40-49. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 40-49 Mots-clés : Refrigeration  system  Carbon  dioxide  Transcritical  cycle  Internal  heat  exchanger  Calculation  Efficiency-superheat Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The performance of an Internal Heat Exchanger (IHX) operating in a CO2 transcritical refrigeration plant is analysed, from an energetic point of view, in this work. The evaluation is based on experimental data by contrasting the performance of the plant working with (44 tests) and without the IHX (46 tests) at the same operating conditions. The experimental evaluation covers three evaporating levels (−5, −10 and −15 °C), at two different gas-cooler outlet temperatures each (31, 34 °C), for a wide range of gas-cooler operating pressures (74.5–105.9 bar). The thermal effectiveness of the IHX is empirically analysed for the different operating conditions in the first part of the paper. Moreover, the relation of its effectiveness with the operating parameters is presented. The second part is devoted to analyse the modification of the energetic performance of the plant caused by the IHX. The results show a maximum increment on cooling capacity of 12%, an increment of the efficiency of the plant up to 12% and a maximum increase on discharge temperature of 10 °C at −15 °C of evaporating temperature. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710001520