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Ejector design and theoretical study of R134a ejector refrigeration cycle / A. Khalil in International journal of refrigeration, Vol. 34 N° 7 (Novembre 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 7 (Novembre 2011) . - pp. 1684-1698 Titre : Ejector design and theoretical study of R134a ejector refrigeration cycle Titre original : Conception de l'éjecteur et étude théorique d'un cycle frigorifique au R134a à éjecteur Type de document : texte imprimé Auteurs : A. Khalil, Auteur ; M. Fatouh, Auteur ; E. Elgendy, Auteur Année de publication : 2011 Article en page(s) : pp. 1684-1698 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : R134a  Ejector  System  Design  Air  conditioning  Performance  Modelling Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : In the present paper, a mathematical model is developed to design R134a ejector and to predict the performance characteristics of a vapor jet refrigeration system over a wide range of the investigated parameters. These parameters include boiling temperature (65–85 °C), condensing temperature (25–40 °C), evaporating temperature (0–10 °C), degrees of superheat (0–15 °C), nozzle efficiency (0.75–0.95) and diffuser efficiency (0.75–0.95). Simulated results showed that the present model data are in good agreement with experimental data in the literature with an average error of 6%. It is found that the ejector area ratio at boiling temperature of 85 °C is about double that at boiling temperature of 65 °C for various evaporating and condensing temperatures. The present results confirm that waste heat sources of temperature ranging from 65 to 85 °C are adequate to operate vapor jet refrigeration system for air-conditioning applications. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000181 [article] Ejector design and theoretical study of R134a ejector refrigeration cycle = Conception de l'éjecteur et étude théorique d'un cycle frigorifique au R134a à éjecteur [texte imprimé] / A. Khalil, Auteur ; M. Fatouh, Auteur ; E. Elgendy, Auteur . - 2011 . - pp. 1684-1698. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 7 (Novembre 2011) . - pp. 1684-1698 Mots-clés : R134a  Ejector  System  Design  Air  conditioning  Performance  Modelling Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : In the present paper, a mathematical model is developed to design R134a ejector and to predict the performance characteristics of a vapor jet refrigeration system over a wide range of the investigated parameters. These parameters include boiling temperature (65–85 °C), condensing temperature (25–40 °C), evaporating temperature (0–10 °C), degrees of superheat (0–15 °C), nozzle efficiency (0.75–0.95) and diffuser efficiency (0.75–0.95). Simulated results showed that the present model data are in good agreement with experimental data in the literature with an average error of 6%. It is found that the ejector area ratio at boiling temperature of 85 °C is about double that at boiling temperature of 65 °C for various evaporating and condensing temperatures. The present results confirm that waste heat sources of temperature ranging from 65 to 85 °C are adequate to operate vapor jet refrigeration system for air-conditioning applications. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000181