Documents disponibles écrits par cet auteur

Carbon dioxide heat transfer coefficients and pressure drops during flow boiling / R. Mastrullo 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. 1068-1085 Titre : Carbon dioxide heat transfer coefficients and pressure drops during flow boiling : Assessment of predictive methods Titre original : Coefficients de transfert de chaleur et chute de pression du dioxyde de carbone lors de l'ébullition en écoulement : évaluation des méthodes prévisionnelles Type de document : texte imprimé Auteurs : R. Mastrullo, Auteur ; A.W. Mauro, Auteur ; A. Rosato, Auteur Année de publication : 2010 Article en page(s) : pp. 1068-1085 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  exchanger  Boiling  Carbon  dioxide-review  Heat  transfer  coefficient  Pressure  drop  Comparison-experiment Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Among the alternatives to the HCFCs and HFCs, carbon dioxide emerged as one of the most promising environmentally friendly refrigerants. In past years many works were carried out about CO2 flow boiling and very different two-phase flow characteristics from conventional fluids were found. In order to assess the best predictive methods for the evaluation of CO2 heat transfer coefficients and pressure gradients in macro-channels, in the current article a literature survey of works and a collection of the results of statistical comparisons available in literature are furnished. In addition the experimental data from University of Naples are used to run a deeper analysis. Both a statistical and a direct comparison against some of the most quoted predictive methods are carried out. Methods implemented both for low–medium pressure refrigerants and specifically developed for R744 are used in the comparison. Some general indications about the choice of the predictive methods dependently on the operating conditions are given. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000757 [article] Carbon dioxide heat transfer coefficients and pressure drops during flow boiling = Coefficients de transfert de chaleur et chute de pression du dioxyde de carbone lors de l'ébullition en écoulement : évaluation des méthodes prévisionnelles : Assessment of predictive methods [texte imprimé] / R. Mastrullo, Auteur ; A.W. Mauro, Auteur ; A. Rosato, Auteur . - 2010 . - pp. 1068-1085. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1068-1085 Mots-clés : Heat  exchanger  Boiling  Carbon  dioxide-review  Heat  transfer  coefficient  Pressure  drop  Comparison-experiment Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Among the alternatives to the HCFCs and HFCs, carbon dioxide emerged as one of the most promising environmentally friendly refrigerants. In past years many works were carried out about CO2 flow boiling and very different two-phase flow characteristics from conventional fluids were found. In order to assess the best predictive methods for the evaluation of CO2 heat transfer coefficients and pressure gradients in macro-channels, in the current article a literature survey of works and a collection of the results of statistical comparisons available in literature are furnished. In addition the experimental data from University of Naples are used to run a deeper analysis. Both a statistical and a direct comparison against some of the most quoted predictive methods are carried out. Methods implemented both for low–medium pressure refrigerants and specifically developed for R744 are used in the comparison. Some general indications about the choice of the predictive methods dependently on the operating conditions are given. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000757

CO2 and propane blends: Experiments and assessment of predictive methods for flow boiling in horizontal tubes / S. Grauso 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. 1028-1039 Titre : CO2 and propane blends: Experiments and assessment of predictive methods for flow boiling in horizontal tubes Titre original : Mélanges de CO2 et de propane : Expériences et évaluation des méthodes de prévision pour l'ébullition en écoulement á l'intérieur de tubes horizontaux Type de document : texte imprimé Auteurs : S. Grauso, Auteur ; R. Mastrullo, Auteur ; A.W. Mauro, Auteur Année de publication : 2011 Article en page(s) : pp. 1028-1039 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Carbon  dioxide  Propane  Mixture  Flow  boiling  Correlation Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The CO2 and propane blends are an interesting alternative to solve technical and safety issues related to the use of pure CO2 or pure hydrocarbons. These mixtures of pure fluids are environmentally friendly and have a large glide, that affects remarkably heat transfer. In this paper a review of works and predictive methods on flow boiling of wide-boiling mixtures is first presented. Experiments during flow boiling in a smooth horizontal tube with an internal diameter equal to 6.00 mm of CO2 and propane mixtures (with 83.2/16.8% and 70.0/30.0% in mass concentrations) are reported. The experiments are related to the following operating ranges: mass fluxes from 200 to 350 kg m−2 s−1, heat fluxes from 10 to 20.2 kW m−2, temperatures of the mixture from 6.9 to 14.0 °C in the whole range of vapor qualities. An assessment of predictive methods based on the present and independent databases is reported. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000648 [article] CO2 and propane blends: Experiments and assessment of predictive methods for flow boiling in horizontal tubes = Mélanges de CO2 et de propane : Expériences et évaluation des méthodes de prévision pour l'ébullition en écoulement á l'intérieur de tubes horizontaux [texte imprimé] / S. Grauso, Auteur ; R. Mastrullo, Auteur ; A.W. Mauro, Auteur . - 2011 . - pp. 1028-1039. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 1028-1039 Mots-clés : Carbon  dioxide  Propane  Mixture  Flow  boiling  Correlation Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The CO2 and propane blends are an interesting alternative to solve technical and safety issues related to the use of pure CO2 or pure hydrocarbons. These mixtures of pure fluids are environmentally friendly and have a large glide, that affects remarkably heat transfer. In this paper a review of works and predictive methods on flow boiling of wide-boiling mixtures is first presented. Experiments during flow boiling in a smooth horizontal tube with an internal diameter equal to 6.00 mm of CO2 and propane mixtures (with 83.2/16.8% and 70.0/30.0% in mass concentrations) are reported. The experiments are related to the following operating ranges: mass fluxes from 200 to 350 kg m−2 s−1, heat fluxes from 10 to 20.2 kW m−2, temperatures of the mixture from 6.9 to 14.0 °C in the whole range of vapor qualities. An assessment of predictive methods based on the present and independent databases is reported. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000648

Flow pattern map, heat transfer and pressure drops during evaporation of R-1234ze(E) and R134a in a horizontal, circular smooth tube / S. Grauso 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. 478–491 Titre : Flow pattern map, heat transfer and pressure drops during evaporation of R-1234ze(E) and R134a in a horizontal, circular smooth tube : experiments and assessment of predictive methods Titre original : Configuration de l'écoulement, transfert de chaleur et chutes de pression pendant l'évaporation de R-1234ze(E) et de R134a à l'intérieur d'un tube lisse circulaire : expériences et évaluation des méthodes prévisionnelles Type de document : texte imprimé Auteurs : S. Grauso, Auteur ; R. Mastrullo, Auteur ; A.W. Mauro, Auteur Année de publication : 2013 Article en page(s) : pp. 478–491 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : R-1234ze(E);  R134a;  Flow  boiling;  Heat  transfer  coefficients;  Adiabatic  pressure  drops;  Flow  regimes;  Predictive  methods Résumé : This paper presents experimental results for local heat transfer coefficients, adiabatic frictional pressure gradients and two-phase flow regimes with the low-GWP refrigerant R-1234ze(E), compared to Hydro-Fluoro-Carbon refrigerant R-134a in the same conditions. In particular the results refer to an experimental investigation carried out in a circular smooth tube of 6.00 mm of inner diameter, for saturation temperatures between −2.9 °C and 12.1 °C, mass fluxes between 146 and 520 kg m−2 s−1 and heat fluxes between 5.0 and 20.4 kW m−2. These experimental results are compared to those for R-134a at the same operating conditions. Moreover, an assessment of predictive methods is provided for local heat transfer coefficients and frictional pressure gradients; also a direct comparison of flow regimes visualizations for R-1234ze(E) with a flow pattern map available in literature is presented. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712001867 [article] Flow pattern map, heat transfer and pressure drops during evaporation of R-1234ze(E) and R134a in a horizontal, circular smooth tube = Configuration de l'écoulement, transfert de chaleur et chutes de pression pendant l'évaporation de R-1234ze(E) et de R134a à l'intérieur d'un tube lisse circulaire : expériences et évaluation des méthodes prévisionnelles : experiments and assessment of predictive methods [texte imprimé] / S. Grauso, Auteur ; R. Mastrullo, Auteur ; A.W. Mauro, Auteur . - 2013 . - pp. 478–491. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 478–491 Mots-clés : R-1234ze(E);  R134a;  Flow  boiling;  Heat  transfer  coefficients;  Adiabatic  pressure  drops;  Flow  regimes;  Predictive  methods Résumé : This paper presents experimental results for local heat transfer coefficients, adiabatic frictional pressure gradients and two-phase flow regimes with the low-GWP refrigerant R-1234ze(E), compared to Hydro-Fluoro-Carbon refrigerant R-134a in the same conditions. In particular the results refer to an experimental investigation carried out in a circular smooth tube of 6.00 mm of inner diameter, for saturation temperatures between −2.9 °C and 12.1 °C, mass fluxes between 146 and 520 kg m−2 s−1 and heat fluxes between 5.0 and 20.4 kW m−2. These experimental results are compared to those for R-134a at the same operating conditions. Moreover, an assessment of predictive methods is provided for local heat transfer coefficients and frictional pressure gradients; also a direct comparison of flow regimes visualizations for R-1234ze(E) with a flow pattern map available in literature is presented. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712001867

Long-period food storage household vertical freezer: Refrigerant charge influence on working conditions during steady operation / F. De Rossi in International journal of refrigeration, Vol. 34 N° 5 (Août 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 5 (Août 2011) . - pp. 1305-1314 Titre : Long-period food storage household vertical freezer: Refrigerant charge influence on working conditions during steady operation Titre original : Congélateur domestique utilisé pour le stockage à long terme des surgelés: l'influence de la charge en frigorigène sur les conditions de fonctionnement en régime permanent Type de document : texte imprimé Auteurs : F. De Rossi, Auteur ; A.W. Mauro, Auteur ; M. Musto, Auteur Année de publication : 2011 Article en page(s) : pp. 1305-1314 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Freezer  Performance  Refrigerant  Charge Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Long-period food storage vertical freezers are small cooling capacity appliances usually working with HC. The particular system architecture and the small thermal load allow the use of natural draft wires and tube heat exchangers with large heat transfer areas. Despite of the good performance achieved, high refrigerant charges with respect to the cooling capacity of the system are required, due to the high volumes of the heat exchangers. In this work an experimental analysis of an apparatus with a typical arrangement of the heat exchangers and capillary tube is presented. The system was first designed according to the current standards to reach high performances. Then the working conditions of the system were completely characterized experimentally in the whole range of refrigerant charges compatible with steady operation. Some general conclusions about the systems with this kind of architecture are furnished about the determination of the thermodynamic optimum operating condition and, hence, the determination of the optimum charge. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002665 [article] Long-period food storage household vertical freezer: Refrigerant charge influence on working conditions during steady operation = Congélateur domestique utilisé pour le stockage à long terme des surgelés: l'influence de la charge en frigorigène sur les conditions de fonctionnement en régime permanent [texte imprimé] / F. De Rossi, Auteur ; A.W. Mauro, Auteur ; M. Musto, Auteur . - 2011 . - pp. 1305-1314. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 5 (Août 2011) . - pp. 1305-1314 Mots-clés : Freezer  Performance  Refrigerant  Charge Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Long-period food storage vertical freezers are small cooling capacity appliances usually working with HC. The particular system architecture and the small thermal load allow the use of natural draft wires and tube heat exchangers with large heat transfer areas. Despite of the good performance achieved, high refrigerant charges with respect to the cooling capacity of the system are required, due to the high volumes of the heat exchangers. In this work an experimental analysis of an apparatus with a typical arrangement of the heat exchangers and capillary tube is presented. The system was first designed according to the current standards to reach high performances. Then the working conditions of the system were completely characterized experimentally in the whole range of refrigerant charges compatible with steady operation. Some general conclusions about the systems with this kind of architecture are furnished about the determination of the thermodynamic optimum operating condition and, hence, the determination of the optimum charge. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002665