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Flow boiling of R1234yf in a 1 mm diameter channel / Davide Del Col in International journal of refrigeration, Vol. 36 N° 2 (N° spécial) (Mars 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 353–362 Titre : Flow boiling of R1234yf in a 1 mm diameter channel Titre original : Ébullition en écoulement du R1234yf dans un canal d'un diamètre de 1 mm Type de document : texte imprimé Auteurs : Davide Del Col, Auteur ; Stefano Bortolin, Auteur ; Daniele Torresin, Auteur Année de publication : 2013 Article en page(s) : pp. 353–362 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Evaporator;  Microchannel;  R1234yf;  Flow  boiling Résumé : Since many HFC refrigerants have relatively large values of GWP, recent development efforts have been initiated to investigate halogenated olefins as possible refrigerants, with fluorinated propene isomers, in particular, having emerged as possible solutions. Specifically, R1234yf has emerged as an R134a replacement for automotive applications. In this paper, the local heat transfer coefficient measured during flow boiling of R1234yf in a 1 mm diameter circular microchannel is reported and compared to R134a. During tests, the heat is provided to the boiling fluid by using a secondary fluid. Therefore the heat flux is not imposed but instead it is the result of the inlet temperatures of the two fluids and the thermal resistances on the two sides, as it occurs in actual heat exchangers for automotive and air-conditioning applications. Flow boiling tests are carried out at 31 °C saturation temperature and mass fluxes ranging between 200 kg m−2 s−1 and 600 kg m−2 s−1. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002861 [article] Flow boiling of R1234yf in a 1 mm diameter channel = Ébullition en écoulement du R1234yf dans un canal d'un diamètre de 1 mm [texte imprimé] / Davide Del Col, Auteur ; Stefano Bortolin, Auteur ; Daniele Torresin, Auteur . - 2013 . - pp. 353–362. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 353–362 Mots-clés : Evaporator;  Microchannel;  R1234yf;  Flow  boiling Résumé : Since many HFC refrigerants have relatively large values of GWP, recent development efforts have been initiated to investigate halogenated olefins as possible refrigerants, with fluorinated propene isomers, in particular, having emerged as possible solutions. Specifically, R1234yf has emerged as an R134a replacement for automotive applications. In this paper, the local heat transfer coefficient measured during flow boiling of R1234yf in a 1 mm diameter circular microchannel is reported and compared to R134a. During tests, the heat is provided to the boiling fluid by using a secondary fluid. Therefore the heat flux is not imposed but instead it is the result of the inlet temperatures of the two fluids and the thermal resistances on the two sides, as it occurs in actual heat exchangers for automotive and air-conditioning applications. Flow boiling tests are carried out at 31 °C saturation temperature and mass fluxes ranging between 200 kg m−2 s−1 and 600 kg m−2 s−1. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002861