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Transcritical carbon dioxide small commercial cooling applications analysis / Luca Cecchinato 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. 50-62 Titre : Transcritical carbon dioxide small commercial cooling applications analysis Titre original : Analyse du dioxyde de carbone transcritique dans les petites applications commerciales Type de document : texte imprimé Auteurs : Luca Cecchinato, Auteur ; Marco Corradi, Auteur Année de publication : 2011 Article en page(s) : pp. 50-62 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Capillary  Carbon  dioxide  Commercial  application  High  pressure  Optimisation  Transcritical  cycle Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents a project to develop an R744 commercial single door bottle cooler that is cost competitive and matches the performance of typical cost optimised R404A and R134a systems. Compressors with different displacement and efficiency values are evaluated for refrigerating systems with fin and tube and steel wire-on-tube gas coolers. Capillary tubes are tested. A methodology to properly sizing them and to optimize the combination of capillary tube and refrigerant charge is developed. The problem of optimal cycle high pressure is addressed and Liao’s approximated solution questioned. Tests demonstrate that the CO2 energy consumption systems are higher than traditional ones especially at ambient temperatures above 25 °C. Carbon dioxide appears to be a feasible option for stand-alone refrigerating equipment in terms of total equivalent warming impact (TEWI) compared to HFC refrigerants with actual single stage R744 compressor technology, only if the refrigeration units operate at medium–low gas cooler inlet temperature. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002276 [article] Transcritical carbon dioxide small commercial cooling applications analysis = Analyse du dioxyde de carbone transcritique dans les petites applications commerciales [texte imprimé] / Luca Cecchinato, Auteur ; Marco Corradi, Auteur . - 2011 . - pp. 50-62. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 50-62 Mots-clés : Capillary  Carbon  dioxide  Commercial  application  High  pressure  Optimisation  Transcritical  cycle Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents a project to develop an R744 commercial single door bottle cooler that is cost competitive and matches the performance of typical cost optimised R404A and R134a systems. Compressors with different displacement and efficiency values are evaluated for refrigerating systems with fin and tube and steel wire-on-tube gas coolers. Capillary tubes are tested. A methodology to properly sizing them and to optimize the combination of capillary tube and refrigerant charge is developed. The problem of optimal cycle high pressure is addressed and Liao’s approximated solution questioned. Tests demonstrate that the CO2 energy consumption systems are higher than traditional ones especially at ambient temperatures above 25 °C. Carbon dioxide appears to be a feasible option for stand-alone refrigerating equipment in terms of total equivalent warming impact (TEWI) compared to HFC refrigerants with actual single stage R744 compressor technology, only if the refrigeration units operate at medium–low gas cooler inlet temperature. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002276