Documents disponibles écrits par cet auteur

Heat transfer and pressure drop of natural refrigerants in minichannels (low charge equipment) / Alberto Cavallini in International journal of refrigeration, Vol. 36 N° 2 (N° spécial) (Mars 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 287–300 Titre : Heat transfer and pressure drop of natural refrigerants in minichannels (low charge equipment) Titre original : Transfert de chaleur et chute de pression des frigorigènes naturels à l'intérieur de minicanaux (équipements à faible charge) Type de document : texte imprimé Auteurs : Alberto Cavallini, Auteur ; Davide Del Col, Auteur ; Luisa Rossetto, Auteur Année de publication : 2013 Article en page(s) : pp. 287–300 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Natural  refrigerants;  Heat  transfer;  Pressure  drop;  Minichannels Résumé : The paper presents a comprehensive overview of the most recent research works on heat transfer (and pressure drop) with natural refrigerants in minichannels, aimed at proper design of heat transfer equipment. About boiling heat transfer, experimental HT results are mainly fitted by empirical correlations referring to the common mechanisms used in more conventional geometries (nucleate and convective boiling); evaporation heat transfer through thin liquid film around vapor plugs is at times considered. About shear dominated condensation heat transfer, suggested design tools again mostly refer to the extension of the semi-empirical correlations earlier established for conventional geometries. For CO2, heat transfer at supercritical conditions, such as in a gas cooler, is also treated. Finally the concept of the Penalty Factor is applied to shear condensation in minichannels to establish the heat transfer performance of the different working fluids, the superior effectiveness of minitubes over macrotubes, and the optimization of minichannel condensers. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003040 [article] Heat transfer and pressure drop of natural refrigerants in minichannels (low charge equipment) = Transfert de chaleur et chute de pression des frigorigènes naturels à l'intérieur de minicanaux (équipements à faible charge) [texte imprimé] / Alberto Cavallini, Auteur ; Davide Del Col, Auteur ; Luisa Rossetto, Auteur . - 2013 . - pp. 287–300. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 287–300 Mots-clés : Natural  refrigerants;  Heat  transfer;  Pressure  drop;  Minichannels Résumé : The paper presents a comprehensive overview of the most recent research works on heat transfer (and pressure drop) with natural refrigerants in minichannels, aimed at proper design of heat transfer equipment. About boiling heat transfer, experimental HT results are mainly fitted by empirical correlations referring to the common mechanisms used in more conventional geometries (nucleate and convective boiling); evaporation heat transfer through thin liquid film around vapor plugs is at times considered. About shear dominated condensation heat transfer, suggested design tools again mostly refer to the extension of the semi-empirical correlations earlier established for conventional geometries. For CO2, heat transfer at supercritical conditions, such as in a gas cooler, is also treated. Finally the concept of the Penalty Factor is applied to shear condensation in minichannels to establish the heat transfer performance of the different working fluids, the superior effectiveness of minitubes over macrotubes, and the optimization of minichannel condensers. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003040

Heat transfer performance of aluminum foams / Simone Mancin in Journal of heat transfer, Vol. 133 N° 6 (Juin 2011) 

Public ISBD [article]  in Journal of heat transfer > Vol. 133 N° 6 (Juin 2011) . - pp. [060904/1-9] Titre : Heat transfer performance of aluminum foams Type de document : texte imprimé Auteurs : Simone Mancin, Auteur ; Claudio Zilio, Auteur ; Luisa Rossetto, Auteur Année de publication : 2011 Article en page(s) : pp. [060904/1-9] Note générale : Physique Langues : Anglais (eng) Mots-clés : Convection  Experimental  Heat  transfer  Pressure  drop  Porous  media Index. décimale : 536 Chaleur. Thermodynamique Résumé : Because of their interesting heat transfer and mechanical properties, metal foams have been proposed for several different applications, thermal and structural. This paper aims at pointing out the effective thermal fluid dynamic behavior of these new enhanced surfaces, which present high heat transfer area per unit of volume at the expense of high pressure drop. The paper presents the experimental heat transfer and pressure drop measurements relative to air flowing in forced convection through four different aluminum foams, when electrically heated. The tested aluminum foams present 5, 10, 20 and 40 PPI (pores per inch), porosity around 0.92–0.93, and 0.02 m of foam core height. The experimental heat transfer coefficients and pressure drops have been obtained by varying the air mass flow rate and the electrical power, which has been set at 25.0 kW m−2, 32.5 kW m−2, and 40.0 kW m−2. The results have been compared against those measured for 40 mm high samples, in order to study the effects of the foam core height on the heat transfer. Moreover, predictions from two recent models are compared with heat transfer coefficient and pressure drop experimental data. The predictions are in good agreement with experimental data. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Heat transfer performance of aluminum foams [texte imprimé] / Simone Mancin, Auteur ; Claudio Zilio, Auteur ; Luisa Rossetto, Auteur . - 2011 . - pp. [060904/1-9]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 6 (Juin 2011) . - pp. [060904/1-9] Mots-clés : Convection  Experimental  Heat  transfer  Pressure  drop  Porous  media Index. décimale : 536 Chaleur. Thermodynamique Résumé : Because of their interesting heat transfer and mechanical properties, metal foams have been proposed for several different applications, thermal and structural. This paper aims at pointing out the effective thermal fluid dynamic behavior of these new enhanced surfaces, which present high heat transfer area per unit of volume at the expense of high pressure drop. The paper presents the experimental heat transfer and pressure drop measurements relative to air flowing in forced convection through four different aluminum foams, when electrically heated. The tested aluminum foams present 5, 10, 20 and 40 PPI (pores per inch), porosity around 0.92–0.93, and 0.02 m of foam core height. The experimental heat transfer coefficients and pressure drops have been obtained by varying the air mass flow rate and the electrical power, which has been set at 25.0 kW m−2, 32.5 kW m−2, and 40.0 kW m−2. The results have been compared against those measured for 40 mm high samples, in order to study the effects of the foam core height on the heat transfer. Moreover, predictions from two recent models are compared with heat transfer coefficient and pressure drop experimental data. The predictions are in good agreement with experimental data. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]

R32 partial condensation inside a brazed plate heat exchanger / Simone Mancin in International journal of refrigeration, Vol. 36 N° 2 (N° spécial) (Mars 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 601–611 Titre : R32 partial condensation inside a brazed plate heat exchanger Titre original : Condensation partielle du R32 à l'intérieur d'un échangeur de chaleur à plaques brasées Type de document : texte imprimé Auteurs : Simone Mancin, Auteur ; Davide Del Col, Auteur ; Luisa Rossetto, Auteur Année de publication : 2013 Article en page(s) : pp. 601–611 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Plate;  Condensation;  Superheating;  R32;  R410A;  Carbon  dioxide  (CO2) Résumé : This paper presents recent measurements of heat transfer coefficient obtained during condensation of R32 inside a commercial brazed plate heat exchanger (BPHE). The experimental data show the effect of refrigerant mass velocity, vapor quality, temperature difference (saturation-to-wall) and inlet vapor superheating. In particular, the specific mass velocity is varied between 15 and 40 kg m−2 s−1 and the outlet vapor quality between 0.0 and 0.65, while inlet vapor superheating goes from 5 to 25 K. The saturation temperature is kept constant at around 36.5 °C, which can be considered a usual temperature level for water cooled heat pump applications. The present authors provide a numerical procedure to calculate the condensation heat transfer in the BPHE, accounting also for the superheating effect. This model is assessed by comparisons with the experimental measurements relative to R32, R410A, and R744. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002794 [article] R32 partial condensation inside a brazed plate heat exchanger = Condensation partielle du R32 à l'intérieur d'un échangeur de chaleur à plaques brasées [texte imprimé] / Simone Mancin, Auteur ; Davide Del Col, Auteur ; Luisa Rossetto, Auteur . - 2013 . - pp. 601–611. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 601–611 Mots-clés : Plate;  Condensation;  Superheating;  R32;  R410A;  Carbon  dioxide  (CO2) Résumé : This paper presents recent measurements of heat transfer coefficient obtained during condensation of R32 inside a commercial brazed plate heat exchanger (BPHE). The experimental data show the effect of refrigerant mass velocity, vapor quality, temperature difference (saturation-to-wall) and inlet vapor superheating. In particular, the specific mass velocity is varied between 15 and 40 kg m−2 s−1 and the outlet vapor quality between 0.0 and 0.65, while inlet vapor superheating goes from 5 to 25 K. The saturation temperature is kept constant at around 36.5 °C, which can be considered a usual temperature level for water cooled heat pump applications. The present authors provide a numerical procedure to calculate the condensation heat transfer in the BPHE, accounting also for the superheating effect. This model is assessed by comparisons with the experimental measurements relative to R32, R410A, and R744. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002794