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Experimental investigation on the effect of mixing length on the performance of two-phase ejector for CO2 refrigeration cycle with and without heat exchanger / M. Nakagawa 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. 1604-1613 Titre : Experimental investigation on the effect of mixing length on the performance of two-phase ejector for CO2 refrigeration cycle with and without heat exchanger Titre original : Etude expérimentale sur l'effet de la longueur du mélangeur sur la performance d'un éjecteur diphasique d'un cycle frigorifique au CO2 avec ou sans échangeur Type de document : texte imprimé Auteurs : M. Nakagawa, Auteur ; Ariel R. Marasigan, Auteur ; T. Matsukawa, Auteur Année de publication : 2011 Article en page(s) : pp. 1604-1613 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Carbon  dioxide  Coefficient  of  performance  Ejector  Experiment  Two-phase Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : In ejector system using the promising natural refrigerant CO2, the mixing of high-speed two-phase primary flow and suction vapor is crucial in designing an efficient ejector. In this study, the effect of mixing length on ejector system performance was analyzed experimentally. The mixing lengths used were 5 mm, 15 mm, and 25 mm, with constant rectangular cross-section. The experiments were performed for both ejector and conventional expansion systems with and without internal heat exchanger (IHX) at different operating conditions. Based on the experimental results, mixing length had significant effect on entrainment ratio and on magnitude and profile of pressure recovery. The 5 mm and 15 mm types yielded the lowest and highest ejector efficiency and COP in all of the conditions used in this research, respectively. The use of IHX had net positive effect on system performance which verified the results of our previous study. A COP improvement of up to 26% over conventional system was obtained but improper sizing of mixing length lowered the COP by as much as 10%. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710001672 [article] Experimental investigation on the effect of mixing length on the performance of two-phase ejector for CO2 refrigeration cycle with and without heat exchanger = Etude expérimentale sur l'effet de la longueur du mélangeur sur la performance d'un éjecteur diphasique d'un cycle frigorifique au CO2 avec ou sans échangeur [texte imprimé] / M. Nakagawa, Auteur ; Ariel R. Marasigan, Auteur ; T. Matsukawa, Auteur . - 2011 . - pp. 1604-1613. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 7 (Novembre 2011) . - pp. 1604-1613 Mots-clés : Carbon  dioxide  Coefficient  of  performance  Ejector  Experiment  Two-phase Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : In ejector system using the promising natural refrigerant CO2, the mixing of high-speed two-phase primary flow and suction vapor is crucial in designing an efficient ejector. In this study, the effect of mixing length on ejector system performance was analyzed experimentally. The mixing lengths used were 5 mm, 15 mm, and 25 mm, with constant rectangular cross-section. The experiments were performed for both ejector and conventional expansion systems with and without internal heat exchanger (IHX) at different operating conditions. Based on the experimental results, mixing length had significant effect on entrainment ratio and on magnitude and profile of pressure recovery. The 5 mm and 15 mm types yielded the lowest and highest ejector efficiency and COP in all of the conditions used in this research, respectively. The use of IHX had net positive effect on system performance which verified the results of our previous study. A COP improvement of up to 26% over conventional system was obtained but improper sizing of mixing length lowered the COP by as much as 10%. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710001672