Documents disponibles écrits par cet auteur

Condensation of the low GWP refrigerant HFO1234ze(E) inside a Brazed Plate Heat Exchanger / Giovanni A. Longo in International journal of refrigeration, Vol. 38 (Février 2014) 

Public ISBD [article]  in International journal of refrigeration > Vol. 38 (Février 2014) . - pp. 250–259 Titre : Condensation of the low GWP refrigerant HFO1234ze(E) inside a Brazed Plate Heat Exchanger Titre original : Condensation du frigorigène à faible GWP HFO1234ze dans un échangeur de chaleur à plaques brasées Type de document : texte imprimé Auteurs : Giovanni A. Longo, Auteur ; Claudio Zilio, Auteur ; Giulia Righetti, Auteur Année de publication : 2014 Article en page(s) : pp. 250–259 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Condensation;  Heat  transfer  coefficient;  Pressure  drop;  Super-heat;  GWP;  BPHE Résumé : This paper presents heat transfer coefficients and pressure drops measured during condensation of the low GWP refrigerant HFO1234ze(E) inside a BPHE. The condensation temperature ranges between 24.8 and 40.2 °C, the refrigerant mass flux from 10.7 to 39.9 kg m−2 s−1 and the heat flux from 5.3 to 26 kW m−2. The heat transfer coefficients show weak sensitivity to saturation temperature and great sensitivity to refrigerant mass flux and vapour super-heating. At low refrigerant mass fluxes (<20 kg m−2 s−1) the heat transfer coefficients are independent of mass flux and condensation is gravity-dominated. For higher refrigerant mass fluxes (>20 kg m−2 s−1) the heat transfer coefficients depend on mass flux and forced convection condensation occurs. In the forced convection condensation region the heat transfer coefficients show a 32%–35% enhancement for a doubling of the refrigerant mass flux. The condensation heat transfer coefficients of super-heated vapour are from 8% to 11% higher than those of saturated vapour. HFO1234ze(E) exhibits lower (4%–6%) heat transfer coefficients and higher (10%) frictional pressure drops than those of HFC134a. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002211 [article] Condensation of the low GWP refrigerant HFO1234ze(E) inside a Brazed Plate Heat Exchanger = Condensation du frigorigène à faible GWP HFO1234ze dans un échangeur de chaleur à plaques brasées [texte imprimé] / Giovanni A. Longo, Auteur ; Claudio Zilio, Auteur ; Giulia Righetti, Auteur . - 2014 . - pp. 250–259. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 38 (Février 2014) . - pp. 250–259 Mots-clés : Condensation;  Heat  transfer  coefficient;  Pressure  drop;  Super-heat;  GWP;  BPHE Résumé : This paper presents heat transfer coefficients and pressure drops measured during condensation of the low GWP refrigerant HFO1234ze(E) inside a BPHE. The condensation temperature ranges between 24.8 and 40.2 °C, the refrigerant mass flux from 10.7 to 39.9 kg m−2 s−1 and the heat flux from 5.3 to 26 kW m−2. The heat transfer coefficients show weak sensitivity to saturation temperature and great sensitivity to refrigerant mass flux and vapour super-heating. At low refrigerant mass fluxes (<20 kg m−2 s−1) the heat transfer coefficients are independent of mass flux and condensation is gravity-dominated. For higher refrigerant mass fluxes (>20 kg m−2 s−1) the heat transfer coefficients depend on mass flux and forced convection condensation occurs. In the forced convection condensation region the heat transfer coefficients show a 32%–35% enhancement for a doubling of the refrigerant mass flux. The condensation heat transfer coefficients of super-heated vapour are from 8% to 11% higher than those of saturated vapour. HFO1234ze(E) exhibits lower (4%–6%) heat transfer coefficients and higher (10%) frictional pressure drops than those of HFC134a. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002211

Mini Vapor Cycle System for high density electronic cooling applications / Simone Mancin in International journal of refrigeration, Vol. 36 N° 4 (Juin 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 4 (Juin 2013) . - pp. 1191–1202 Titre : Mini Vapor Cycle System for high density electronic cooling applications Titre original : Système à cycle à vapeur miniaturisé pour les applications de refroidissement dans le contexte d'une forte densité électronique Type de document : texte imprimé Auteurs : Simone Mancin, Auteur ; Claudio Zilio, Auteur ; Giulia Righetti, Auteur Année de publication : 2013 Article en page(s) : pp. 1191–1202 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Mini  Vapor  Cycle  System;  Electronic  cooling;  Aeronautical  environment;  Oil-free  compressor Résumé : This paper reports the experimental analysis of a mini Vapor Cycle System (VCS) for electronic thermal management in avionic applications. The water cooled miniature scale refrigeration system uses R134a as working fluid and implements a new concept oil-free linear compressor prototype. In the range of operating test conditions investigated the pressure ratio varies from 1.54 to 3.75, the cooling capacity of the system varied from 37 W to 374 W, while the coefficient of performance (COP) ranged between 1.04 and 5.80. Particular attention was dedicated to the cold plate design, which had to meet the requirements established by aeronautical standards. The cold plate was equipped with 15 thermocouples in order to monitor the wall temperature distribution. The suitability and feasibility of the proposed cold plate for electronic thermal management in an aeronautical environment is critically discussed, based on the experimental results. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003519 [article] Mini Vapor Cycle System for high density electronic cooling applications = Système à cycle à vapeur miniaturisé pour les applications de refroidissement dans le contexte d'une forte densité électronique [texte imprimé] / Simone Mancin, Auteur ; Claudio Zilio, Auteur ; Giulia Righetti, Auteur . - 2013 . - pp. 1191–1202. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 4 (Juin 2013) . - pp. 1191–1202 Mots-clés : Mini  Vapor  Cycle  System;  Electronic  cooling;  Aeronautical  environment;  Oil-free  compressor Résumé : This paper reports the experimental analysis of a mini Vapor Cycle System (VCS) for electronic thermal management in avionic applications. The water cooled miniature scale refrigeration system uses R134a as working fluid and implements a new concept oil-free linear compressor prototype. In the range of operating test conditions investigated the pressure ratio varies from 1.54 to 3.75, the cooling capacity of the system varied from 37 W to 374 W, while the coefficient of performance (COP) ranged between 1.04 and 5.80. Particular attention was dedicated to the cold plate design, which had to meet the requirements established by aeronautical standards. The cold plate was equipped with 15 thermocouples in order to monitor the wall temperature distribution. The suitability and feasibility of the proposed cold plate for electronic thermal management in an aeronautical environment is critically discussed, based on the experimental results. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003519