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Performance characterization of R134a and R245fa in a high aspect ratio microchannel condenser / Ebrahim Al-Hajri 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. 588–600 Titre : Performance characterization of R134a and R245fa in a high aspect ratio microchannel condenser Titre original : Caractérisation de la performance du R134a et du R245fa dans un condenseur à microcanaux avec un rapport longueur-diamètre élevé Type de document : texte imprimé Auteurs : Ebrahim Al-Hajri, Auteur ; Amir H. Shooshtari, Auteur ; Serguei Dessiatoun, Auteur Année de publication : 2013 Article en page(s) : pp. 588–600 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Condensation;  Microchannels;  Heat  transfer  coefficient;  Pressure  drop;  Experimentation;  Correlations Résumé : An experimental study on parametric characterization of two-phase condensing flows of refrigerants R134a and R245fa in a single microchannel was carried out utilizing a microchannel with a cross-section of 0.4 mm × 2.8 mm (7:1 aspect ratio) and length of 190 mm. The study investigated parametric effects of variations in saturation temperatures between 30 °C and 70 °C, mass flux between 50 and 500 kg m−2 s−1, and inlet superheats between 0 °C and 20 °C on the average heat transfer coefficient and overall pressure drops in the microchannel. The results of the study suggest that while the saturation temperature and mass flux have a significant effect on both the heat transfer and overall pressure drop coefficients, the inlet superheat has little or no effect. In addition, the applicability of the Dobson–Chato correlation for heat transfer coefficient and Lockhart–Martinelli correlation for pressure drop for the range of parameters was investigated. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002678 [article] Performance characterization of R134a and R245fa in a high aspect ratio microchannel condenser = Caractérisation de la performance du R134a et du R245fa dans un condenseur à microcanaux avec un rapport longueur-diamètre élevé [texte imprimé] / Ebrahim Al-Hajri, Auteur ; Amir H. Shooshtari, Auteur ; Serguei Dessiatoun, Auteur . - 2013 . - pp. 588–600. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 588–600 Mots-clés : Condensation;  Microchannels;  Heat  transfer  coefficient;  Pressure  drop;  Experimentation;  Correlations Résumé : An experimental study on parametric characterization of two-phase condensing flows of refrigerants R134a and R245fa in a single microchannel was carried out utilizing a microchannel with a cross-section of 0.4 mm × 2.8 mm (7:1 aspect ratio) and length of 190 mm. The study investigated parametric effects of variations in saturation temperatures between 30 °C and 70 °C, mass flux between 50 and 500 kg m−2 s−1, and inlet superheats between 0 °C and 20 °C on the average heat transfer coefficient and overall pressure drops in the microchannel. The results of the study suggest that while the saturation temperature and mass flux have a significant effect on both the heat transfer and overall pressure drop coefficients, the inlet superheat has little or no effect. In addition, the applicability of the Dobson–Chato correlation for heat transfer coefficient and Lockhart–Martinelli correlation for pressure drop for the range of parameters was investigated. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002678