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Revue internationale du froid / IIF(Institut International du Froid) (Paris, France) . Vol 32, Issue 3Mention de date : 2009 Paru le : 04/01/2012 |
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Ajouter le résultat dans votre panierVacuum freezing type ice slurry production using ethanol solution 1st report: Measurement of vapor–liquid equilibrium data of ethanol solution at 20 °C and at the freezing temperature in Revue internationale du froid, Vol 32, Issue 3 (2009)
[article]
Titre : Vacuum freezing type ice slurry production using ethanol solution 1st report: Measurement of vapor–liquid equilibrium data of ethanol solution at 20 °C and at the freezing temperature Titre original : Production de coulis de glace à l’aide d’une solution d’éthanol et d’un processus de refroidissement sous vide. 1er rapport : données sur l’équilibre vapeur-liquide de l’éthanol à 20 °C et le point de congélation Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 387-393 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Coulis de glace Éthanol liquide-vapeur Température de congélation Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : In this study, an original method for the production of ice slurry from ethanol solution without using a refrigerator is proposed. This system has advantages compared with similar existing systems using materials other than ethanol solution. In this paper, the vapor–liquid equilibrium data of ethanol solution at 20 °C and at the freezing temperature are measured, which is necessary to calculate the COP of this ice slurry producing system. In the experiments, two experimental methods are proposed to measure the saturated pressure and the vapor composition of ethanol solution. Each method has an advantage in their operating temperature range. As a result, the vapor–liquid equilibrium diagrams of ethanol solution at 20 °C and at the freezing temperature, and approximations of saturated pressure of various concentrations of ethanol solution for varying liquid temperature, are obtained.
in Revue internationale du froid > Vol 32, Issue 3 (2009) . - pp. 387-393[article] Vacuum freezing type ice slurry production using ethanol solution 1st report: Measurement of vapor–liquid equilibrium data of ethanol solution at 20 °C and at the freezing temperature = Production de coulis de glace à l’aide d’une solution d’éthanol et d’un processus de refroidissement sous vide. 1er rapport : données sur l’équilibre vapeur-liquide de l’éthanol à 20 °C et le point de congélation [texte imprimé] . - 2012 . - pp. 387-393.
Langues : Anglais (eng) Français (fre)
in Revue internationale du froid > Vol 32, Issue 3 (2009) . - pp. 387-393
Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Coulis de glace Éthanol liquide-vapeur Température de congélation Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : In this study, an original method for the production of ice slurry from ethanol solution without using a refrigerator is proposed. This system has advantages compared with similar existing systems using materials other than ethanol solution. In this paper, the vapor–liquid equilibrium data of ethanol solution at 20 °C and at the freezing temperature are measured, which is necessary to calculate the COP of this ice slurry producing system. In the experiments, two experimental methods are proposed to measure the saturated pressure and the vapor composition of ethanol solution. Each method has an advantage in their operating temperature range. As a result, the vapor–liquid equilibrium diagrams of ethanol solution at 20 °C and at the freezing temperature, and approximations of saturated pressure of various concentrations of ethanol solution for varying liquid temperature, are obtained. Vacuum freezing type ice slurry production using ethanol solution 2nd report: Investigation on evaporation characteristics of ice slurry in ice production in Revue internationale du froid, Vol 32, Issue 3 (2009)
[article]
Titre : Vacuum freezing type ice slurry production using ethanol solution 2nd report: Investigation on evaporation characteristics of ice slurry in ice production Titre original : Production de coulis de glace à l'aide d'une solution d'éthanol et d'un processus de refroidissement sous vide. 2e rapport : étude sur les caractéristiques d'évaporation du coulis de glace lors de la production de glace Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 394-401 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Coulis de glace vide- éthanol COP - sublimation Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : In this study, an original method for production of ice slurry from ethanol solution without using a refrigerator is proposed. As was introduced in the first report, this system has advantages compared with similar existing systems using materials other than ethanol solution. In this paper, the process of producing ice slurry using this method was observed, and the relationship between ethanol concentration of the solution and that of the vapor, which evaporated from the ice-solution mixture, was measured. It was found that the ethanol concentration of vapor was lower than that in the condition that did not produce ice. The composition of vapor was found to be affected by the sublimation of the ice produced. Finally, the COP of this system was estimated and the effect of sublimation of ice was investigated.
in Revue internationale du froid > Vol 32, Issue 3 (2009) . - pp. 394-401[article] Vacuum freezing type ice slurry production using ethanol solution 2nd report: Investigation on evaporation characteristics of ice slurry in ice production = Production de coulis de glace à l'aide d'une solution d'éthanol et d'un processus de refroidissement sous vide. 2e rapport : étude sur les caractéristiques d'évaporation du coulis de glace lors de la production de glace [texte imprimé] . - 2012 . - pp. 394-401.
Langues : Anglais (eng) Français (fre)
in Revue internationale du froid > Vol 32, Issue 3 (2009) . - pp. 394-401
Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Coulis de glace vide- éthanol COP - sublimation Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : In this study, an original method for production of ice slurry from ethanol solution without using a refrigerator is proposed. As was introduced in the first report, this system has advantages compared with similar existing systems using materials other than ethanol solution. In this paper, the process of producing ice slurry using this method was observed, and the relationship between ethanol concentration of the solution and that of the vapor, which evaporated from the ice-solution mixture, was measured. It was found that the ethanol concentration of vapor was lower than that in the condition that did not produce ice. The composition of vapor was found to be affected by the sublimation of the ice produced. Finally, the COP of this system was estimated and the effect of sublimation of ice was investigated. Effect of pressure on the vacuum cooling of iceberg lettuce in Revue internationale du froid, Vol 32, Issue 3 (2009)
[article]
Titre : Effect of pressure on the vacuum cooling of iceberg lettuce Titre original : Effet de la pression sur le refroidissement sous vide de laitue iceberg Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 402-410 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système évaporatif Pression Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Le refroidissement sous vide est connu comme une technique evaporative rapide refroidissant pour n'importe quel produit poreux qui a de l'eau libre. Le but de ce papier est d'appliquer le refroidissement sous vide pour le refroidissement de la laitue et examiner l'effet de la pression sur le temps de refroidissement et la diminution de température. Les résultats de refroidissement sous vide sont aussi comparés avec le refroidissement conventionnel (refroidissement dans le réfrigérateur) pour les différentes températures. Le refroidissement à vide de laitue à 0.7 kPa est environ 13 fois plus vite que le refroidissement conventionnel de laitue croquante à 6 °C. Il a été aussi constaté qu'il n'est pas possible de diminuer la température de laitue ci-dessous 10 °C si le refroidissement sous vide est utilisé comme méthode et la pression à vide est montrée à 1.5 kPa.
in Revue internationale du froid > Vol 32, Issue 3 (2009) . - pp. 402-410[article] Effect of pressure on the vacuum cooling of iceberg lettuce = Effet de la pression sur le refroidissement sous vide de laitue iceberg [texte imprimé] . - 2012 . - pp. 402-410.
Langues : Anglais (eng) Français (fre)
in Revue internationale du froid > Vol 32, Issue 3 (2009) . - pp. 402-410
Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système évaporatif Pression Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Le refroidissement sous vide est connu comme une technique evaporative rapide refroidissant pour n'importe quel produit poreux qui a de l'eau libre. Le but de ce papier est d'appliquer le refroidissement sous vide pour le refroidissement de la laitue et examiner l'effet de la pression sur le temps de refroidissement et la diminution de température. Les résultats de refroidissement sous vide sont aussi comparés avec le refroidissement conventionnel (refroidissement dans le réfrigérateur) pour les différentes températures. Le refroidissement à vide de laitue à 0.7 kPa est environ 13 fois plus vite que le refroidissement conventionnel de laitue croquante à 6 °C. Il a été aussi constaté qu'il n'est pas possible de diminuer la température de laitue ci-dessous 10 °C si le refroidissement sous vide est utilisé comme méthode et la pression à vide est montrée à 1.5 kPa. Development of W/O emulsion to form harmless ice slurry to human being in Revue internationale du froid, Vol 32, Issue 3 (2009)
[article]
Titre : Development of W/O emulsion to form harmless ice slurry to human being Titre original : Développement d'une émulsion huile/eau sans toxicité pour l'homme, pour les coulis de glace Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 411-420 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Coulis de glace Entreposage frigorifique Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : In order to form ice slurry in ice storage, W/O emulsion was made from water–oil mixture with a small amount of surfactant. And, it was proved that ice slurry could be formed even in a metal vessel, which is expected to improve ice formation rate, without ice adhesion to a cooling vessel wall because of a structural feature of the emulsion. In this paper, authors proposed application of ice slurry to cold storage of foods. In order to apply ice slurry to cold storage of foods, a new harmless ice slurry to human being was formed by cooling a new W/O emulsion made from tap water–edible oil mixture with a small amount of edible emulsifier. And, the fundamental characteristics and availability of new W/O emulsion-ice slurry formed were clarified. Finally, it was concluded that new harmless ice slurry to human being could be fully applied to cold storage of foods.
in Revue internationale du froid > Vol 32, Issue 3 (2009) . - pp. 411-420[article] Development of W/O emulsion to form harmless ice slurry to human being = Développement d'une émulsion huile/eau sans toxicité pour l'homme, pour les coulis de glace [texte imprimé] . - 2012 . - pp. 411-420.
Langues : Anglais (eng) Français (fre)
in Revue internationale du froid > Vol 32, Issue 3 (2009) . - pp. 411-420
Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Coulis de glace Entreposage frigorifique Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : In order to form ice slurry in ice storage, W/O emulsion was made from water–oil mixture with a small amount of surfactant. And, it was proved that ice slurry could be formed even in a metal vessel, which is expected to improve ice formation rate, without ice adhesion to a cooling vessel wall because of a structural feature of the emulsion. In this paper, authors proposed application of ice slurry to cold storage of foods. In order to apply ice slurry to cold storage of foods, a new harmless ice slurry to human being was formed by cooling a new W/O emulsion made from tap water–edible oil mixture with a small amount of edible emulsifier. And, the fundamental characteristics and availability of new W/O emulsion-ice slurry formed were clarified. Finally, it was concluded that new harmless ice slurry to human being could be fully applied to cold storage of foods. Pressure drop correlation for oil–refrigerant R134a mixture flashing flow in a small diameter tube in Revue internationale du froid, Vol 32, Issue 3 (2009)
[article]
Titre : Pressure drop correlation for oil–refrigerant R134a mixture flashing flow in a small diameter tube Titre original : Corrélation de la chute de pression d'un mélange de frigorigène R134a et d'huile en écoulement à l'intérieur d'un tube de faible diamètre Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 421-429 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système frigorifique Huile de synthèse Écoulement diphasique Corrélation Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : This paper presents an experimental investigation of the ester oil ISO VG10/refrigerant R134a mixture flashing flow in a 6.0 m long, 3.22 mm ID tube, which is one of the primary steps towards the construction of a methodology for the study of the lubrication and gas leakage in refrigeration compressors. The phase change starts with solubility reduction of the refrigerant in the oil as the pressure decreases due to the friction forces. In this flashing flow the foam pattern is observed at the end of the tube as vapor quality reaches high values, and this is a particular phenomenon of this kind of mixture flow. In order to study this pressure drop, an experimental apparatus was designed to allow the measurement of both pressure and temperature profiles along the tube as well as the visualization of the flow patterns. Pressure and temperature distribution along the flow were measured for saturation pressure ranging from 450 to 650 kPa, mass flux ranging from about 2000 to 3000 kg/(m2s), temperatures around 303 K, and inlet refrigerant concentration varying between 0.2 and 0.4 kg ref/kg mixt. An available correlation proposed to predict the frictional pressure drop for a mixture composed by the mineral oil SUNISO 1GS and refrigerant R12 flowing in small diameter tubes yielded large deviations in predicting the ester oil and refrigerant R134a mixture flow. A new correlation has been proposed that fitted the experimental data with rms deviations of 24%.
in Revue internationale du froid > Vol 32, Issue 3 (2009) . - pp. 421-429[article] Pressure drop correlation for oil–refrigerant R134a mixture flashing flow in a small diameter tube = Corrélation de la chute de pression d'un mélange de frigorigène R134a et d'huile en écoulement à l'intérieur d'un tube de faible diamètre [texte imprimé] . - 2012 . - pp. 421-429.
Langues : Anglais (eng) Français (fre)
in Revue internationale du froid > Vol 32, Issue 3 (2009) . - pp. 421-429
Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Système frigorifique Huile de synthèse Écoulement diphasique Corrélation Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : This paper presents an experimental investigation of the ester oil ISO VG10/refrigerant R134a mixture flashing flow in a 6.0 m long, 3.22 mm ID tube, which is one of the primary steps towards the construction of a methodology for the study of the lubrication and gas leakage in refrigeration compressors. The phase change starts with solubility reduction of the refrigerant in the oil as the pressure decreases due to the friction forces. In this flashing flow the foam pattern is observed at the end of the tube as vapor quality reaches high values, and this is a particular phenomenon of this kind of mixture flow. In order to study this pressure drop, an experimental apparatus was designed to allow the measurement of both pressure and temperature profiles along the tube as well as the visualization of the flow patterns. Pressure and temperature distribution along the flow were measured for saturation pressure ranging from 450 to 650 kPa, mass flux ranging from about 2000 to 3000 kg/(m2s), temperatures around 303 K, and inlet refrigerant concentration varying between 0.2 and 0.4 kg ref/kg mixt. An available correlation proposed to predict the frictional pressure drop for a mixture composed by the mineral oil SUNISO 1GS and refrigerant R12 flowing in small diameter tubes yielded large deviations in predicting the ester oil and refrigerant R134a mixture flow. A new correlation has been proposed that fitted the experimental data with rms deviations of 24%. Performance and optimum design analysis of convective fin arrays attached to flat and curved primary surfaces in Revue internationale du froid, Vol 32, Issue 3 (2009)
[article]
Titre : Performance and optimum design analysis of convective fin arrays attached to flat and curved primary surfaces Titre original : Performance et analyse de la conception optimale des nappes de tubes à ailettes fixés sur des surfaces plates ou en courbe Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 430-443 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Échangeur de chaleur Optimisation Tube aileté Ailette Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : A model has been developed analytically to carry out the performance and optimum design analysis of four fin arrays, namely, longitudinal rectangular fin array (LRFA), annular rectangular fin array (ARFA), longitudinal trapezoidal fin array (LTRA) and annular trapezoidal fin array (ATFA) under convective cooling conditions. The performance parameters such as fin efficiency, fin effectiveness and augmentation factor are evaluated for a wide range of design variables. It has been observed that the conduction through the supporting structure and the convection from the interfin spacing have a pronounced effect on the performance of a fin array. The optimum fin dimensions in a fin assembly have been determined by consideration of the constant total height of the fin assembly and interfin spacing. From the results, it can be highlighted that the optimum fin dimensions in fin arrays differ from that of the individual fins.
in Revue internationale du froid > Vol 32, Issue 3 (2009) . - pp. 430-443[article] Performance and optimum design analysis of convective fin arrays attached to flat and curved primary surfaces = Performance et analyse de la conception optimale des nappes de tubes à ailettes fixés sur des surfaces plates ou en courbe [texte imprimé] . - 2012 . - pp. 430-443.
Langues : Anglais (eng) Français (fre)
in Revue internationale du froid > Vol 32, Issue 3 (2009) . - pp. 430-443
Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Échangeur de chaleur Optimisation Tube aileté Ailette Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : A model has been developed analytically to carry out the performance and optimum design analysis of four fin arrays, namely, longitudinal rectangular fin array (LRFA), annular rectangular fin array (ARFA), longitudinal trapezoidal fin array (LTRA) and annular trapezoidal fin array (ATFA) under convective cooling conditions. The performance parameters such as fin efficiency, fin effectiveness and augmentation factor are evaluated for a wide range of design variables. It has been observed that the conduction through the supporting structure and the convection from the interfin spacing have a pronounced effect on the performance of a fin array. The optimum fin dimensions in a fin assembly have been determined by consideration of the constant total height of the fin assembly and interfin spacing. From the results, it can be highlighted that the optimum fin dimensions in fin arrays differ from that of the individual fins. Fundamental study on adhesion of ice to solid surface: Discussion on coupling of nano-scale field with macro-scale field in Revue internationale du froid, Vol 32, Issue 3 (2009)
[article]
Titre : Fundamental study on adhesion of ice to solid surface: Discussion on coupling of nano-scale field with macro-scale field Titre original : Etude de base sur l’adhésion de glace sur une surface solide : discussion sur le couplage d’un champ à l’échelle nano avec un champ macro Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 444-453 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : In a previous study, it was reported that the removal process (behavior) of ice from a cooling solid surface depended on the characteristic of the solid surface, and that the ice adhesion force to the cooling surface was mainly governed by the surface energy of the surface. In the present study, using the method of surface analysis, the ice removal process and the ice adhesion force clarified in a macro-scale field were also discussed in a nano-scale field to couple these scale fields. Simultaneously, another surface analysis of the solid surface was carried out to identify the distributions of hydrophilic and hydrophobic groups on a solid surface. Attempts to couple the nano-scale field with the macro-scale field revealed that the results for both scale fields were in approximate qualitative agreement.
in Revue internationale du froid > Vol 32, Issue 3 (2009) . - pp. 444-453[article] Fundamental study on adhesion of ice to solid surface: Discussion on coupling of nano-scale field with macro-scale field = Etude de base sur l’adhésion de glace sur une surface solide : discussion sur le couplage d’un champ à l’échelle nano avec un champ macro [texte imprimé] . - 2012 . - pp. 444-453.
Langues : Anglais (eng) Français (fre)
in Revue internationale du froid > Vol 32, Issue 3 (2009) . - pp. 444-453
Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : In a previous study, it was reported that the removal process (behavior) of ice from a cooling solid surface depended on the characteristic of the solid surface, and that the ice adhesion force to the cooling surface was mainly governed by the surface energy of the surface. In the present study, using the method of surface analysis, the ice removal process and the ice adhesion force clarified in a macro-scale field were also discussed in a nano-scale field to couple these scale fields. Simultaneously, another surface analysis of the solid surface was carried out to identify the distributions of hydrophilic and hydrophobic groups on a solid surface. Attempts to couple the nano-scale field with the macro-scale field revealed that the results for both scale fields were in approximate qualitative agreement.