Documents disponibles écrits par cet auteur

Experimental analysis on pressure drop and heat transfer of a terminal fan-coil unit with ice slurry as cooling medium / José Fernández-Seara in International journal of refrigeration, Vol. 33 N° 6 (Septembre 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1095-1104 Titre : Experimental analysis on pressure drop and heat transfer of a terminal fan-coil unit with ice slurry as cooling medium Titre original : Analyse expérimentale de la chute de pression et du transfert de chaleur d'un ventilo-convecteur dans un système employant un coulis de glace pour le refroidissement Type de document : texte imprimé Auteurs : José Fernández-Seara, Auteur ; Rubén Diz, Auteur ; Francisco J. Uhía, Auteur Année de publication : 2010 Article en page(s) : pp. 1095-1104 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Air  conditioning  Experiment  Ice  slurry  Fan-coil  unit  Heat  transfer  Pressure  drop Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper is concerned with the experimental analysis of a standard terminal fan-coil unit with ice slurry as coolant. The ice slurry was produced from an ethylene glycol 10 wt% aqueous solution. The pressure drop measurements are presented as a function of volumetric flow rate, ice concentration and Reynolds number. The experimental friction factors are obtained and discussed. The fan-coil capacity was experimentally determined for chilled water and melting ice slurry with inlet ice fractions around 5, 10, 15 and 20 wt%, considering in each case three different fan rotation velocities. The fan-coil capacity is higher with melting ice slurry than with chilled water by factors between 3.7 and 4.9. The heat transfer analysis realizes that the air side thermal resistance controls the heat transfer process. Experimental results for the melt off rate of ice in the fan coil and the superheating at the fan-coil outlet are shown and discussed. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000836 [article] Experimental analysis on pressure drop and heat transfer of a terminal fan-coil unit with ice slurry as cooling medium = Analyse expérimentale de la chute de pression et du transfert de chaleur d'un ventilo-convecteur dans un système employant un coulis de glace pour le refroidissement [texte imprimé] / José Fernández-Seara, Auteur ; Rubén Diz, Auteur ; Francisco J. Uhía, Auteur . - 2010 . - pp. 1095-1104. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1095-1104 Mots-clés : Air  conditioning  Experiment  Ice  slurry  Fan-coil  unit  Heat  transfer  Pressure  drop Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper is concerned with the experimental analysis of a standard terminal fan-coil unit with ice slurry as coolant. The ice slurry was produced from an ethylene glycol 10 wt% aqueous solution. The pressure drop measurements are presented as a function of volumetric flow rate, ice concentration and Reynolds number. The experimental friction factors are obtained and discussed. The fan-coil capacity was experimentally determined for chilled water and melting ice slurry with inlet ice fractions around 5, 10, 15 and 20 wt%, considering in each case three different fan rotation velocities. The fan-coil capacity is higher with melting ice slurry than with chilled water by factors between 3.7 and 4.9. The heat transfer analysis realizes that the air side thermal resistance controls the heat transfer process. Experimental results for the melt off rate of ice in the fan coil and the superheating at the fan-coil outlet are shown and discussed. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000836

Modelling and experimental validation of the hot-gas defrost process of an air-cooled evaporator / J. Alberto Dopazo in International journal of refrigeration, Vol. 33 N° 4 (Juin 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 4 (Juin 2010) . - pp. 829-839 Titre : Modelling and experimental validation of the hot-gas defrost process of an air-cooled evaporator Titre original : Modélisation et validation expérimentale du processus de dégivrage à l'aide de gaz chaud d'un évaporateur refroidi par air Type de document : texte imprimé Auteurs : J. Alberto Dopazo, Auteur ; José Fernández-Seara, Auteur ; Francisco J. Uhía, Auteur Année de publication : 2010 Article en page(s) : pp. 829-839 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Evaporator  Modelling  Simulation  Experiment  Process  Defrosting  Hot  gas Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A detailed transient simulation model has been developed to predict and evaluate the performance of the hot-gas defrost process of an air-coil evaporator. In the model, the defrost process is subdivided into six stages: preheating, tube frost melting start, fin frost melting start, air presence, tube-fin water film and dry-heating. In each stage, the control volume is subdivided into systems represented by a single node, which has the representative properties of the system. A finite difference approach was used to solve the model equations. The results include the time required to defrost, the distribution of the energy during defrost process, the instantaneous refrigerant properties and the instantaneous fin and tube temperature distribution. The results are compared with experimental data obtained in a local storage facility under actual operating conditions and also using data available in the literature. The model results substantially agree with the experimental data in both cases. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000083 [article] Modelling and experimental validation of the hot-gas defrost process of an air-cooled evaporator = Modélisation et validation expérimentale du processus de dégivrage à l'aide de gaz chaud d'un évaporateur refroidi par air [texte imprimé] / J. Alberto Dopazo, Auteur ; José Fernández-Seara, Auteur ; Francisco J. Uhía, Auteur . - 2010 . - pp. 829-839. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 4 (Juin 2010) . - pp. 829-839 Mots-clés : Evaporator  Modelling  Simulation  Experiment  Process  Defrosting  Hot  gas Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A detailed transient simulation model has been developed to predict and evaluate the performance of the hot-gas defrost process of an air-coil evaporator. In the model, the defrost process is subdivided into six stages: preheating, tube frost melting start, fin frost melting start, air presence, tube-fin water film and dry-heating. In each stage, the control volume is subdivided into systems represented by a single node, which has the representative properties of the system. A finite difference approach was used to solve the model equations. The results include the time required to defrost, the distribution of the energy during defrost process, the instantaneous refrigerant properties and the instantaneous fin and tube temperature distribution. The results are compared with experimental data obtained in a local storage facility under actual operating conditions and also using data available in the literature. The model results substantially agree with the experimental data in both cases. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000083