Documents disponibles écrits par cet auteur

In-situ study of frosting and defrosting processes in tube-fin evaporators of household refrigerating appliances / Fernando T. Knabben in International journal of refrigeration, Vol. 34 N° 8 (Décembre 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 8 (Décembre 2011) . - pp. 2031–2041 Titre : In-situ study of frosting and defrosting processes in tube-fin evaporators of household refrigerating appliances Titre original : Etude sur les processus de givrage et de dégivrage des évaporateurs à tubes ailetés des appareils frigorifiques domestiques Type de document : texte imprimé Auteurs : Fernando T. Knabben, Auteur ; Christian J.L. Hermes, Auteur ; Cláudio Melo, Auteur Année de publication : 2012 Article en page(s) : pp. 2031–2041 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Frosting  Defrosting  Evaporator  Refrigerator Résumé : The present paper advances an in-situ study of frosting and defrosting processes in tube-fin evaporators of household refrigerators and freezers. Frost growth experiments were carried out using a purpose-built test facility comprised of a refrigerated cabinet placed inside a climatized chamber, and a vapor compression refrigeration loop that controls both the evaporating temperature and the evaporator superheating. A first-principles two-dimensional simulation model was put forward to predict the evaporator blocking over time, and also the heat and mass transfer rates. The model validation exercise has shown that the model follows well the experimental trends of pressure drop, frost mass, cooling capacity and air flow rate, with all predictions falling inside ±10% error bounds. The model was then used to assess the impact of several design parameters on both the evaporator blockage and defrost efficiency. It was found that a nearly ideal defrost efficiency is achieved when the defrosting process is performed by two simultaneous heaters. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001800 [article] In-situ study of frosting and defrosting processes in tube-fin evaporators of household refrigerating appliances = Etude sur les processus de givrage et de dégivrage des évaporateurs à tubes ailetés des appareils frigorifiques domestiques [texte imprimé] / Fernando T. Knabben, Auteur ; Christian J.L. Hermes, Auteur ; Cláudio Melo, Auteur . - 2012 . - pp. 2031–2041. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 8 (Décembre 2011) . - pp. 2031–2041 Mots-clés : Frosting  Defrosting  Evaporator  Refrigerator Résumé : The present paper advances an in-situ study of frosting and defrosting processes in tube-fin evaporators of household refrigerators and freezers. Frost growth experiments were carried out using a purpose-built test facility comprised of a refrigerated cabinet placed inside a climatized chamber, and a vapor compression refrigeration loop that controls both the evaporating temperature and the evaporator superheating. A first-principles two-dimensional simulation model was put forward to predict the evaporator blocking over time, and also the heat and mass transfer rates. The model validation exercise has shown that the model follows well the experimental trends of pressure drop, frost mass, cooling capacity and air flow rate, with all predictions falling inside ±10% error bounds. The model was then used to assess the impact of several design parameters on both the evaporator blockage and defrost efficiency. It was found that a nearly ideal defrost efficiency is achieved when the defrosting process is performed by two simultaneous heaters. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001800

A study of transcritical carbon dioxide flow through diabatic capillary tubes / Diogo L. da Silva in International journal of refrigeration, Vol. 34 N° 4 (Juin 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 834-843 Titre : A study of transcritical carbon dioxide flow through diabatic capillary tubes Titre original : Etude sur l'écoulement du dioxyde de carbone transcritique à l'intérieur de tubes capillaires diabatiques Type de document : texte imprimé Auteurs : Diogo L. da Silva, Auteur ; Adriano F. Ronzoni, Auteur ; Cláudio Melo, Auteur Année de publication : 2011 Article en page(s) : pp. 834-843 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Carbon  dioxide  Expansion  Capillary  tube  Heat  exchanger Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : An experimental and theoretical study of the diabatic flow of carbon dioxide through lateral capillary tube suction line heat exchangers is outlined. The influence of both operating conditions (capillary tube inlet and outlet pressures, capillary tube inlet temperature and suction line inlet temperature) and tube geometry (heat exchanger length and position, suction line diameter and capillary tube length) on the heat and mass flow rates was experimentally evaluated using a purpose-built testing facility. In total, 75 tests were carried out with heat fluxes spanning from 1 to 11 kW m−2 and refrigerant mass flow rates ranging from 12 to 26 kg h−1. In addition, the mathematical model of Hermes et al. (2008) was adapted to run with carbon dioxide as working fluid. The model was validated against experimental data, and a good agreement between the experimental and calculated mass flow rates was achieved with 85% and 98% of the data points being within ±5% and ±10% error bounds, respectively. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000569 [article] A study of transcritical carbon dioxide flow through diabatic capillary tubes = Etude sur l'écoulement du dioxyde de carbone transcritique à l'intérieur de tubes capillaires diabatiques [texte imprimé] / Diogo L. da Silva, Auteur ; Adriano F. Ronzoni, Auteur ; Cláudio Melo, Auteur . - 2011 . - pp. 834-843. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 834-843 Mots-clés : Carbon  dioxide  Expansion  Capillary  tube  Heat  exchanger Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : An experimental and theoretical study of the diabatic flow of carbon dioxide through lateral capillary tube suction line heat exchangers is outlined. The influence of both operating conditions (capillary tube inlet and outlet pressures, capillary tube inlet temperature and suction line inlet temperature) and tube geometry (heat exchanger length and position, suction line diameter and capillary tube length) on the heat and mass flow rates was experimentally evaluated using a purpose-built testing facility. In total, 75 tests were carried out with heat fluxes spanning from 1 to 11 kW m−2 and refrigerant mass flow rates ranging from 12 to 26 kg h−1. In addition, the mathematical model of Hermes et al. (2008) was adapted to run with carbon dioxide as working fluid. The model was validated against experimental data, and a good agreement between the experimental and calculated mass flow rates was achieved with 85% and 98% of the data points being within ±5% and ±10% error bounds, respectively. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000569