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Improved rotary vane expander for trans-critical CO2 cycle by introducing high-pressure gas into the vane slots / Xiaohan Jia in International journal of refrigeration, Vol. 34 N° 3 (Mai 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 3 (Mai 2011) . - pp. 732-741 Titre : Improved rotary vane expander for trans-critical CO2 cycle by introducing high-pressure gas into the vane slots Titre original : Machine de détente à pales rotatives pour un cycle au CO2 transcritique, avec introduction de gaz sous pression élevée dans les ouvertures Type de document : texte imprimé Auteurs : Xiaohan Jia, Auteur ; Bo Zhang, Auteur ; Silvia Minetto, Auteur Année de publication : 2011 Article en page(s) : pp. 732-741 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Carbon  dioxide  Transcritical  cycle  Expansion  Device  Energy  recovery  Friction Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The loss of contact between the vane tip and cylinder wall was proven to cause a serious leakage and inefficient operation of the rotary vane expander, which was developed to replace the throttling valve in the trans-critical CO2 refrigeration system. An improved structure was suggested by introducing high-pressure gas into the vane slots. This paper presents the experimental investigation of the improved prototype expander. By comparing the improved prototype with the original, focusing on the expander performance and the p–θ diagram as well as the vane movement, the effects of introducing high-pressure gas into the slots on the thermodynamic processes and performance were analyzed. The results showed that, by introducing the high-pressure gas into the vane slots, the volumetric efficiency was increased from 17% to 35%, and the isentropic efficiency improved from 15% to 45%, resulting in a maximum COP improvement of 27.2% compared to the throttling cycle under the same working conditions. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002793 [article] Improved rotary vane expander for trans-critical CO2 cycle by introducing high-pressure gas into the vane slots = Machine de détente à pales rotatives pour un cycle au CO2 transcritique, avec introduction de gaz sous pression élevée dans les ouvertures [texte imprimé] / Xiaohan Jia, Auteur ; Bo Zhang, Auteur ; Silvia Minetto, Auteur . - 2011 . - pp. 732-741. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 3 (Mai 2011) . - pp. 732-741 Mots-clés : Carbon  dioxide  Transcritical  cycle  Expansion  Device  Energy  recovery  Friction Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The loss of contact between the vane tip and cylinder wall was proven to cause a serious leakage and inefficient operation of the rotary vane expander, which was developed to replace the throttling valve in the trans-critical CO2 refrigeration system. An improved structure was suggested by introducing high-pressure gas into the vane slots. This paper presents the experimental investigation of the improved prototype expander. By comparing the improved prototype with the original, focusing on the expander performance and the p–θ diagram as well as the vane movement, the effects of introducing high-pressure gas into the slots on the thermodynamic processes and performance were analyzed. The results showed that, by introducing the high-pressure gas into the vane slots, the volumetric efficiency was increased from 17% to 35%, and the isentropic efficiency improved from 15% to 45%, resulting in a maximum COP improvement of 27.2% compared to the throttling cycle under the same working conditions. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002793