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Use of variable geometry ejector with cold store to achieve high solar fraction for solar cooling / M. Dennis 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. 1626-1632 Titre : Use of variable geometry ejector with cold store to achieve high solar fraction for solar cooling Titre original : Utilisation d'un éjecteur à géométrie variable avec accumulation thermique pour obtenir une fraction solaire élevée dans le domaine du froid solaire Type de document : texte imprimé Auteurs : M. Dennis, Auteur ; K. Garzoli, Auteur Année de publication : 2011 Article en page(s) : pp. 1626-1632 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Solar  collector  Ejector  System  Thermal  storage  Modelling Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Concerns over environmental impact of heat pump cooling systems have led to a revival of solar ejector cooling systems. In order to achieve high solar fractions, the common approach is to increase the solar collector area. However, this is costly and does not provide cooling after sunset. This paper uses software modelling to examine the use of variable geometry ejectors and cold stores to increase the annual yield of an ejector system. The study concludes that a variable geometry ejector is able to increase yield by 8–13% compared to a fixed geometry ejector. However, a 46–50% increase in solar fraction is available if a 60 MJ cold store is included compared to a fixed geometry ejector without storage and up to 63% increase in solar fraction is available if a variable geometry ejector and 60 MJ cold store is used. Alternatively, the modelling shows how the solar collector area may be decreased if a cold store is used and this may benefit the capital and operating cost of the system. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710001787 [article] Use of variable geometry ejector with cold store to achieve high solar fraction for solar cooling = Utilisation d'un éjecteur à géométrie variable avec accumulation thermique pour obtenir une fraction solaire élevée dans le domaine du froid solaire [texte imprimé] / M. Dennis, Auteur ; K. Garzoli, Auteur . - 2011 . - pp. 1626-1632. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 7 (Novembre 2011) . - pp. 1626-1632 Mots-clés : Solar  collector  Ejector  System  Thermal  storage  Modelling Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Concerns over environmental impact of heat pump cooling systems have led to a revival of solar ejector cooling systems. In order to achieve high solar fractions, the common approach is to increase the solar collector area. However, this is costly and does not provide cooling after sunset. This paper uses software modelling to examine the use of variable geometry ejectors and cold stores to increase the annual yield of an ejector system. The study concludes that a variable geometry ejector is able to increase yield by 8–13% compared to a fixed geometry ejector. However, a 46–50% increase in solar fraction is available if a 60 MJ cold store is included compared to a fixed geometry ejector without storage and up to 63% increase in solar fraction is available if a variable geometry ejector and 60 MJ cold store is used. Alternatively, the modelling shows how the solar collector area may be decreased if a cold store is used and this may benefit the capital and operating cost of the system. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710001787