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Refrigerant distribution in the vertical header of the microchannel heat exchanger / Yang Zou in International journal of refrigeration, Vol. 36 N° 8 (Décembre 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 8 (Décembre 2013) . - pp. 2196-2208 Titre : Refrigerant distribution in the vertical header of the microchannel heat exchanger : measurement and visualization of R410A flow Titre original : Distribution du frigorigène dans le collecteur vertical d'un échangeur de chaleur à microcanaux – Mesures et visualisation de l'écoulement du R410A Type de document : texte imprimé Auteurs : Yang Zou, Auteur ; Pega S. Hrnjak, Auteur Année de publication : 2014 Article en page(s) : pp. 2196-2208 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Two-phase  flow;  refrigerant  distribution;  vertical  header;  microchannel;  heat  exchanger Résumé : This paper presents the R410A adiabatic upward flow in three vertical headers of microchannel heat exchangers. All microchannel tubes are inserted into the half depth. The objectives are to explore what affects R410A distribution and attempt to predict the distribution. R410A is circulated into the header through the (5 or 10) tubes in the bottom pass and exits through the (5 or 10) tubes in the top pass. It represents the flow in the outdoor heat exchanger (usually used as the condenser) when it is used as the evaporator in the heat pump mode of reversible systems. The quality was typically varied from 0.2 to 0.8 and the mass flow rate from 1.5 to 4.5 kg h−1 per tube. The best distribution was observed at high mass flux and low quality. The experiment and visualization reveals the flow pattern effects in terms of homogeneity and momentum. The churn flow had better distribution since the two-phase mixture was more homogenous and the distribution was better at high mass flux in the header because the higher momentum liquid was able to reach the top exit tube. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001102 [article] Refrigerant distribution in the vertical header of the microchannel heat exchanger = Distribution du frigorigène dans le collecteur vertical d'un échangeur de chaleur à microcanaux – Mesures et visualisation de l'écoulement du R410A : measurement and visualization of R410A flow [texte imprimé] / Yang Zou, Auteur ; Pega S. Hrnjak, Auteur . - 2014 . - pp. 2196-2208. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 8 (Décembre 2013) . - pp. 2196-2208 Mots-clés : Two-phase  flow;  refrigerant  distribution;  vertical  header;  microchannel;  heat  exchanger Résumé : This paper presents the R410A adiabatic upward flow in three vertical headers of microchannel heat exchangers. All microchannel tubes are inserted into the half depth. The objectives are to explore what affects R410A distribution and attempt to predict the distribution. R410A is circulated into the header through the (5 or 10) tubes in the bottom pass and exits through the (5 or 10) tubes in the top pass. It represents the flow in the outdoor heat exchanger (usually used as the condenser) when it is used as the evaporator in the heat pump mode of reversible systems. The quality was typically varied from 0.2 to 0.8 and the mass flow rate from 1.5 to 4.5 kg h−1 per tube. The best distribution was observed at high mass flux and low quality. The experiment and visualization reveals the flow pattern effects in terms of homogeneity and momentum. The churn flow had better distribution since the two-phase mixture was more homogenous and the distribution was better at high mass flux in the header because the higher momentum liquid was able to reach the top exit tube. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001102