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Condensation heat transfer characteristics of CO2 in a horizontal smooth tube / Piljoo Kang in International journal of refrigeration, Vol. 36 N° 3 (Mai 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 1090–1097 Titre : Condensation heat transfer characteristics of CO2 in a horizontal smooth tube Titre original : Caractéristiques de transfert de chaleur du CO2 à l'intérieur d'un tube lisse horizontal Type de document : texte imprimé Auteurs : Piljoo Kang, Auteur ; Jaehyeok Heo, Auteur ; Rin Yun, Auteur Année de publication : 2013 Article en page(s) : pp. 1090–1097 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Condensation  heat  transfer;  Carbon  dioxide  (CO2);  Heat  transfer  coefficient;  Pressure  drop;  Low  temperature Résumé : The condensation heat transfer characteristics of CO2 flowing in a horizontal smooth tube were investigated. The tube diameter was 5.15 mm. The condensation temperature ranged from −10 to 5 °C, and the mass flux was from 600 to 1000 kg m−2 s−1. When the temperature changed from 0 to −10 °C, the increase rate of the heat transfer coefficient was from 9.4 to 14.6%, and the pressure drop increased from 6.2 to 52.9%. When the mass flux increased from 600 to 1000 kg m−2 s−1, the heat transfer coefficient increased from 6 to 35%, and the pressure drop increased from 60 to 165%, which were dependent on the condensation temperature. The increases come from the change of vapor velocity and thermophysical properties with condensation temperature. Considering large variation of mass flux from 200 to 1200 kg m−2 s−1 by including the existing studies, the effect of mass flux on condensation heat transfer coefficient was minor. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002617 [article] Condensation heat transfer characteristics of CO2 in a horizontal smooth tube = Caractéristiques de transfert de chaleur du CO2 à l'intérieur d'un tube lisse horizontal [texte imprimé] / Piljoo Kang, Auteur ; Jaehyeok Heo, Auteur ; Rin Yun, Auteur . - 2013 . - pp. 1090–1097. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 1090–1097 Mots-clés : Condensation  heat  transfer;  Carbon  dioxide  (CO2);  Heat  transfer  coefficient;  Pressure  drop;  Low  temperature Résumé : The condensation heat transfer characteristics of CO2 flowing in a horizontal smooth tube were investigated. The tube diameter was 5.15 mm. The condensation temperature ranged from −10 to 5 °C, and the mass flux was from 600 to 1000 kg m−2 s−1. When the temperature changed from 0 to −10 °C, the increase rate of the heat transfer coefficient was from 9.4 to 14.6%, and the pressure drop increased from 6.2 to 52.9%. When the mass flux increased from 600 to 1000 kg m−2 s−1, the heat transfer coefficient increased from 6 to 35%, and the pressure drop increased from 60 to 165%, which were dependent on the condensation temperature. The increases come from the change of vapor velocity and thermophysical properties with condensation temperature. Considering large variation of mass flux from 200 to 1200 kg m−2 s−1 by including the existing studies, the effect of mass flux on condensation heat transfer coefficient was minor. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002617