Dépouillements

Dielectric properties of liquid refrigerants: Facts and trends in Revue internationale du froid, vol 34, issue 2 (mars 2011)

Public ISBD [article]  inRevue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 393–401 Titre : Dielectric properties of liquid refrigerants: Facts and trends Titre original : Propriétés diélectriques des frigorigènes liquides : données et tendances Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 393–401 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Température de Debye; Constante diélectrique; Propriété électrique; HFC; Propriété thermodynamique - viscosité Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : In this paper we analyse the situation for the dielectric properties of the refrigerants, from the experimental and theoretical point of view, based on more than one decade of research of our group. Examples of the predictive power of simple models will illustrate the existing tools for electrical permittivity and dipole moment prediction and correlation. The relation of Báron and Buep was analysed and extended to include the effects of pressure variation. Analogies between the Vedam equation and rough hard-sphere theory of transport properties were encountered and discussed. [article] Dielectric properties of liquid refrigerants: Facts and trends = Propriétés diélectriques des frigorigènes liquides : données et tendances [texte imprimé] . - 2012 . - pp. 393–401. Langues : Anglais (eng) Français (fre) in Revue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 393–401 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Température de Debye; Constante diélectrique; Propriété électrique; HFC; Propriété thermodynamique - viscosité Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : In this paper we analyse the situation for the dielectric properties of the refrigerants, from the experimental and theoretical point of view, based on more than one decade of research of our group. Examples of the predictive power of simple models will illustrate the existing tools for electrical permittivity and dipole moment prediction and correlation. The relation of Báron and Buep was analysed and extended to include the effects of pressure variation. Analogies between the Vedam equation and rough hard-sphere theory of transport properties were encountered and discussed.

Refrigerant injection for heat pumping/air conditioning systems: Literature review and challenges discussions in Revue internationale du froid, vol 34, issue 2 (mars 2011)

Public ISBD [article]  inRevue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 402–415 Titre : Refrigerant injection for heat pumping/air conditioning systems: Literature review and challenges discussions Titre original : Injection du frigorigène dans les systèmes à pompe à chaleur et de conditionnement d'air : passage en revue de la littérature et discussion sur les défis Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 402–415 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Liquide; Vapeur; Séparation; Injection; Réservoir; Èchangeur de chaleu Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : This paper reviews the major research on refrigerant injection techniques in detail. Liquid and vapor refrigerant injection techniques are discussed and compared. The current research on refrigerant injection techniques falls into two categories: system level research and component level research. The system level research is focused on low ambient temperature heating, heat pump water heating, high ambient temperature cooling, cycle comparison, and control strategy development. Internal heat exchanger and flash tank cycles are the two typical cycles for refrigerant injection. These two cycles are discussed and compared in detail. The component level research is focused on employing different types of compressors, variable speed compressors, the injection process, and the flash tank. Different types of compressors employing refrigerant injection are presented. Based on the literature study, the potential future research directions are presented and discussed. The flash tank cycle control strategy and refrigerant charge management strategy are worth further research efforts. Compressor design can be improved in order to optimize the performance with refrigerant injection. The appropriate design of flash tanks plays a vital role in achieving appropriate two-phase flow patterns in the flash tank. Computational Fluid Dynamics (CFD) modeling can be a useful tool to facilitate the design of the flash tank. [article] Refrigerant injection for heat pumping/air conditioning systems: Literature review and challenges discussions = Injection du frigorigène dans les systèmes à pompe à chaleur et de conditionnement d'air : passage en revue de la littérature et discussion sur les défis [texte imprimé] . - 2012 . - pp. 402–415. Langues : Anglais (eng) Français (fre) in Revue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 402–415 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Liquide; Vapeur; Séparation; Injection; Réservoir; Èchangeur de chaleu Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : This paper reviews the major research on refrigerant injection techniques in detail. Liquid and vapor refrigerant injection techniques are discussed and compared. The current research on refrigerant injection techniques falls into two categories: system level research and component level research. The system level research is focused on low ambient temperature heating, heat pump water heating, high ambient temperature cooling, cycle comparison, and control strategy development. Internal heat exchanger and flash tank cycles are the two typical cycles for refrigerant injection. These two cycles are discussed and compared in detail. The component level research is focused on employing different types of compressors, variable speed compressors, the injection process, and the flash tank. Different types of compressors employing refrigerant injection are presented. Based on the literature study, the potential future research directions are presented and discussed. The flash tank cycle control strategy and refrigerant charge management strategy are worth further research efforts. Compressor design can be improved in order to optimize the performance with refrigerant injection. The appropriate design of flash tanks plays a vital role in achieving appropriate two-phase flow patterns in the flash tank. Computational Fluid Dynamics (CFD) modeling can be a useful tool to facilitate the design of the flash tank.

Studies on the heating capacity control of a multi-type heat pump system applying a multi-input multi-output (MIMO) method in Revue internationale du froid, vol 34, issue 2 (mars 2011)

Public ISBD [article]  inRevue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 416-428 Titre : Studies on the heating capacity control of a multi-type heat pump system applying a multi-input multi-output (MIMO) method Titre original : Etudes sur la régulation de la puissance thermique d'un système à pompe à chaleur de type multiple employant une méthode comportant plusieurs grandeurs d'entrée et de sortie Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 416-428 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Régulation de la puissance; Grandeurs d'entrée; Grandeurs de sortie; Pompe à chaleur; Système; Régulation; Variable; Intégral Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : This paper describes a method to control capacity of a multi-type heat pump system. Because indoor units are interconnected, alteration of the heating or cooling setting of one indoor unit can influence the performance of the other indoor units. Proportional-integral (PI) controllers were used to assess system performance, and the PI controllers’ gain values were optimized by using a genetic algorithm. A system model was established following a system identification optimization process, and a pseudo random binary sequence was selected as the system identification input signal. A multi-input multi-output (MIMO) controller was more effective in reducing such cross-coupling effects than a single-input single-output (SISO) controller. The temperature at the secondary fluid outlet in the condenser and the saturation pressure at the evaporator were selected as the control variables in the MIMO controller. The experimental results showed that an optimized MIMO controller could reduce overshoot by up to 40% compared with the results using a SISO controller. [article] Studies on the heating capacity control of a multi-type heat pump system applying a multi-input multi-output (MIMO) method = Etudes sur la régulation de la puissance thermique d'un système à pompe à chaleur de type multiple employant une méthode comportant plusieurs grandeurs d'entrée et de sortie [texte imprimé] . - 2012 . - pp. 416-428. Langues : Anglais (eng) Français (fre) in Revue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 416-428 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Régulation de la puissance; Grandeurs d'entrée; Grandeurs de sortie; Pompe à chaleur; Système; Régulation; Variable; Intégral Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : This paper describes a method to control capacity of a multi-type heat pump system. Because indoor units are interconnected, alteration of the heating or cooling setting of one indoor unit can influence the performance of the other indoor units. Proportional-integral (PI) controllers were used to assess system performance, and the PI controllers’ gain values were optimized by using a genetic algorithm. A system model was established following a system identification optimization process, and a pseudo random binary sequence was selected as the system identification input signal. A multi-input multi-output (MIMO) controller was more effective in reducing such cross-coupling effects than a single-input single-output (SISO) controller. The temperature at the secondary fluid outlet in the condenser and the saturation pressure at the evaporator were selected as the control variables in the MIMO controller. The experimental results showed that an optimized MIMO controller could reduce overshoot by up to 40% compared with the results using a SISO controller.

Numerical study on the steady state and transient performance of a multi-type heat pump system in Revue internationale du froid, vol 34, issue 2 (mars 2011)

Public ISBD [article]  inRevue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 429–443 Titre : Numerical study on the steady state and transient performance of a multi-type heat pump system Titre original : Etude numérique sur le régime permanent et la performance en régime transitoire d’un système à pompe à chaleur polyvalent Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 429–443 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Pompe à chaleur; Système-polyvalente; Èchangeur de chaleur; Régime permanent; Régime transitoire; Refoulement-surchauffe Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Numerical methods are provided to analyze dynamic characteristics as well as steady-state performance of a multi-type heat pump system. Lumped parameter method was applied to simulate the compressor and expansion device. Additionally, fully distributed method was used for analyzing the condenser and evaporators. The transient terms in the governing equations for heat exchangers were solved adopting the wave equation solutions. The simulation results predict the steady-state performance of a heat pump system with the deviation of ±10%. The transient simulation showed satisfactory responses of temperatures and pressures for various compressor speeds or expansion valve openings. From the results, it was shown that the operating conditions of secondary fluid of one indoor unit had minor influence on the performance of the other unit, while opening of expansion valve affected the transient responses of both evaporators significantly. [article] Numerical study on the steady state and transient performance of a multi-type heat pump system = Etude numérique sur le régime permanent et la performance en régime transitoire d’un système à pompe à chaleur polyvalent [texte imprimé] . - 2012 . - pp. 429–443. Langues : Anglais (eng) Français (fre) in Revue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 429–443 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Pompe à chaleur; Système-polyvalente; Èchangeur de chaleur; Régime permanent; Régime transitoire; Refoulement-surchauffe Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Numerical methods are provided to analyze dynamic characteristics as well as steady-state performance of a multi-type heat pump system. Lumped parameter method was applied to simulate the compressor and expansion device. Additionally, fully distributed method was used for analyzing the condenser and evaporators. The transient terms in the governing equations for heat exchangers were solved adopting the wave equation solutions. The simulation results predict the steady-state performance of a heat pump system with the deviation of ±10%. The transient simulation showed satisfactory responses of temperatures and pressures for various compressor speeds or expansion valve openings. From the results, it was shown that the operating conditions of secondary fluid of one indoor unit had minor influence on the performance of the other unit, while opening of expansion valve affected the transient responses of both evaporators significantly.

Comparison of the heating performance of air-source heat pumps using various types of refrigerant injection in Revue internationale du froid, vol 34, issue 2 (mars 2011)

Public ISBD [article]  inRevue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 444-453 Titre : Comparison of the heating performance of air-source heat pumps using various types of refrigerant injection Titre original : Comparaison de la performance en mode chauffage des pompes à chaleur air-eau utilisant diffàrents types d'injection de frigorigàne 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 Mots-clés : Sompe à chaleur; Biàtagà; Système-injection; Performance-chauffage Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : The performance degradation of air-source heat pumps cannot be avoided when they operate at both very low and high ambient temperatures. The refrigerant injection technique has rapidly developed in recent years due to its outstanding performance at low ambient temperatures. This study measured the heating performance of air-source heat pumps in which novel vapor injection techniques of a combined flash tank and sub-cooler (FTSC) cycle and a double expansion sub-cooler (DESC) cycle were applied. The performance of these cycles was compared with that of a flash tank (FT) and a sub-cooler (SC) cycle. The average heating capacities of the FT, FTSC, and DESC cycles were higher by 14.4%, 6.0%, and 3.8%, respectively, relative to that of the SC cycle, but the average COPs for the respective cycle options were very similar. [article] Comparison of the heating performance of air-source heat pumps using various types of refrigerant injection = Comparaison de la performance en mode chauffage des pompes à chaleur air-eau utilisant diffàrents types d'injection de frigorigàne [texte imprimé] . - 2012 . - pp. 444-453. Langues : Anglais (eng) Français (fre) in Revue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 444-453 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Sompe à chaleur; Biàtagà; Système-injection; Performance-chauffage Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : The performance degradation of air-source heat pumps cannot be avoided when they operate at both very low and high ambient temperatures. The refrigerant injection technique has rapidly developed in recent years due to its outstanding performance at low ambient temperatures. This study measured the heating performance of air-source heat pumps in which novel vapor injection techniques of a combined flash tank and sub-cooler (FTSC) cycle and a double expansion sub-cooler (DESC) cycle were applied. The performance of these cycles was compared with that of a flash tank (FT) and a sub-cooler (SC) cycle. The average heating capacities of the FT, FTSC, and DESC cycles were higher by 14.4%, 6.0%, and 3.8%, respectively, relative to that of the SC cycle, but the average COPs for the respective cycle options were very similar.

Effect of Al2O3 nanolubricant on R134a pool boiling heat transfer in Revue internationale du froid, vol 34, issue 2 (mars 2011)

Public ISBD [article]  inRevue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 498–508 Titre : Effect of Al2O3 nanolubricant on R134a pool boiling heat transfer Titre original : L’effet du nanolubrifiant Al2O3 sur le transfert de chaleur lors de l’ébullition libre de R134a Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 498–508 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Ébullition; Flux thermique; Lubrifiant; Particule; Frigorigène; R134a Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : This paper quantifies the influence of Al2O3 nanoparticles on the pool-boiling performance of R134a/polyolester mixtures on a roughened, horizontal, flat surface. The nanoparticles enhanced the boiling heat transfer relative to that for R134a/polyolester mixtures without nanoparticles for the three lubricant mass fractions that were tested. For the 0.5% nanolubricant mass fraction, the nanoparticles caused a heat transfer enhancement relative to the heat transfer of pure R134a/polyolester (99.5/0.5) as large as 400% for the lowest heat flux. The average heat flux improvement for heat fluxes less than 40 kW m?2 was approximately 105%, 49%, and 155% for the 0.5%, the 1%, and the 2% mass fractions, respectively. A semi-empirical model was developed to predict the boiling enhancement as caused by the interaction of the nanoparticles with the bubbles. The model suggests that small particle size and large nanoparticle volume fraction improve boiling enhancement. [article] Effect of Al2O3 nanolubricant on R134a pool boiling heat transfer = L’effet du nanolubrifiant Al2O3 sur le transfert de chaleur lors de l’ébullition libre de R134a [texte imprimé] . - 2012 . - pp. 498–508. Langues : Anglais (eng) Français (fre) in Revue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 498–508 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Ébullition; Flux thermique; Lubrifiant; Particule; Frigorigène; R134a Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : This paper quantifies the influence of Al2O3 nanoparticles on the pool-boiling performance of R134a/polyolester mixtures on a roughened, horizontal, flat surface. The nanoparticles enhanced the boiling heat transfer relative to that for R134a/polyolester mixtures without nanoparticles for the three lubricant mass fractions that were tested. For the 0.5% nanolubricant mass fraction, the nanoparticles caused a heat transfer enhancement relative to the heat transfer of pure R134a/polyolester (99.5/0.5) as large as 400% for the lowest heat flux. The average heat flux improvement for heat fluxes less than 40 kW m?2 was approximately 105%, 49%, and 155% for the 0.5%, the 1%, and the 2% mass fractions, respectively. A semi-empirical model was developed to predict the boiling enhancement as caused by the interaction of the nanoparticles with the bubbles. The model suggests that small particle size and large nanoparticle volume fraction improve boiling enhancement.

Performance evaluation and optimal design of supermarket refrigeration systems with supermarket model “SuperSim”. Part II: Model applications in Revue internationale du froid, vol 34, issue 2 (mars 2011)

Public ISBD [article]  inRevue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 540–549 Titre : Performance evaluation and optimal design of supermarket refrigeration systems with supermarket model “SuperSim”. Part II: Model applications Titre original : Evaluation de la performance et conception optimale de systèmes frigorifiques pour supermarchés à l'aide du modèle ≪ SuperSim ≫. Partie II : applications du modèle Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 540–549 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Supermarché; Modèle; Dioxyde de carbone; R404A; Régulation; Comparaison Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : As described in Part I, the supermarket simulation software “SuperSim” with its integrated refrigeration, building and HVAC system models, can be used to evaluate, compare and optimize alternative supermarket refrigeration systems. In Part II the model was used to evaluate and compare the performance of a CO2 booster refrigeration system with that of a conventional R404A multiplex system in a supermarket application. Floating head pressure control was implemented for both systems when they were in subcritical cycles. For the CO2 system, when the system was in transcritical cycle due to higher ambient air temperature, the head pressure was optimized through extensive thermodynamic cycle analysis as a function of ambient air temperature. The performance of the CO2 booster system in the supermarket was then simulated during a one year period and compared with that of the R404A system. As a result, the system performance will benefit from a lower ambient temperature and a sizeable heat recovery for the CO2 system [article] Performance evaluation and optimal design of supermarket refrigeration systems with supermarket model “SuperSim”. Part II: Model applications = Evaluation de la performance et conception optimale de systèmes frigorifiques pour supermarchés à l'aide du modèle ≪ SuperSim ≫. Partie II : applications du modèle [texte imprimé] . - 2012 . - pp. 540–549. Langues : Anglais (eng) Français (fre) in Revue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 540–549 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Supermarché; Modèle; Dioxyde de carbone; R404A; Régulation; Comparaison Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : As described in Part I, the supermarket simulation software “SuperSim” with its integrated refrigeration, building and HVAC system models, can be used to evaluate, compare and optimize alternative supermarket refrigeration systems. In Part II the model was used to evaluate and compare the performance of a CO2 booster refrigeration system with that of a conventional R404A multiplex system in a supermarket application. Floating head pressure control was implemented for both systems when they were in subcritical cycles. For the CO2 system, when the system was in transcritical cycle due to higher ambient air temperature, the head pressure was optimized through extensive thermodynamic cycle analysis as a function of ambient air temperature. The performance of the CO2 booster system in the supermarket was then simulated during a one year period and compared with that of the R404A system. As a result, the system performance will benefit from a lower ambient temperature and a sizeable heat recovery for the CO2 system

Prediction of frost deposition on a horizontal circular cylinder under natural convection using artificial neural networks in Revue internationale du froid, vol 34, issue 2 (mars 2011)

Public ISBD [article]  inRevue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 560-566 Titre : Prediction of frost deposition on a horizontal circular cylinder under natural convection using artificial neural networks Titre original : Prévision de la déposition de givre sur un cylindre horizontal sous convection naturelle à l'aide de réseaux neuronaux Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 560-566 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Réseau neuronal; Givre; Convection libre; Cylindre horizontal Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : In the present work Artificial Neural Network is used to predict frost thickness and density around a cooled horizontal circular cylinder having constant surface temperature under natural convection for different ambient conditions. The database for ANN generated from the experimental measurements. In the present work a multilayer perceptron network is used and it is found that the back-propagation algorithm with Levenberg–Marquardt learning rule is the best choice to estimate frost growth due to accurate and faster training procedure. Experimental measurements are used for training and testing the ANN approach and comparison is performed among the soft programming ANN and experimental measurements. It is observed that ANN soft programming code can be used more efficiently to determine frost thickness and density around a cold horizontal cylinder. Based on the developed ANN wide range of frost formation over various cylinder diameters are determined and presented for various conditions. [article] Prediction of frost deposition on a horizontal circular cylinder under natural convection using artificial neural networks = Prévision de la déposition de givre sur un cylindre horizontal sous convection naturelle à l'aide de réseaux neuronaux [texte imprimé] . - 2012 . - pp. 560-566. Langues : Anglais (eng) Français (fre) in Revue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 560-566 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Réseau neuronal; Givre; Convection libre; Cylindre horizontal Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : In the present work Artificial Neural Network is used to predict frost thickness and density around a cooled horizontal circular cylinder having constant surface temperature under natural convection for different ambient conditions. The database for ANN generated from the experimental measurements. In the present work a multilayer perceptron network is used and it is found that the back-propagation algorithm with Levenberg–Marquardt learning rule is the best choice to estimate frost growth due to accurate and faster training procedure. Experimental measurements are used for training and testing the ANN approach and comparison is performed among the soft programming ANN and experimental measurements. It is observed that ANN soft programming code can be used more efficiently to determine frost thickness and density around a cold horizontal cylinder. Based on the developed ANN wide range of frost formation over various cylinder diameters are determined and presented for various conditions.

Experimental and numerical modelling comparison of thermal performance of expanded polystyrene and corrugated plastic packaging for fresh fish in Revue internationale du froid, vol 34, issue 2 (mars 2011)

Public ISBD [article]  inRevue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 573–585 Titre : Experimental and numerical modelling comparison of thermal performance of expanded polystyrene and corrugated plastic packaging for fresh fish Titre original : Comparaison expérimentale et numérique de la modélisation de la performance thermique du polystyrène expansé et de la matière plastique ondulée utilisés comme emballage du poisson frais Type de document : texte imprimé Année de publication : 2012 Article en page(s) : pp. 573–585 Langues : Anglais (eng) Français (fre) Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Produit alimentaire réfrigéré; Variation de température; Isolation; Emballage; Modèle-transfert de chaleur Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Experiments were carried out to compare the thermal performance of wholesale fresh fish boxes made of corrugated plastic (CP) and expanded polystyrene (EPS). Free standing boxes containing whole, fresh fillets were exposed to dynamic thermal loads. The chilling effect of frozen ice packs was studied by including them in some of the boxes. The frozen ice packs proved efficient for protecting fresh fish fillets against temperature abuse. Furthermore, the results show that the insulating performance of EPS is significantly better than the insulating capacity of CP. Maximum fish temperature of 16.1 °C (CP) and 11.0 °C (EPS) were recorded inside the thermally abused boxes without ice packs, initially at 1.9 to 2.1 °C and stored for 6.1 h at a mean ambient temperature of 19.4 °C. The fish temperature distributions during thermal abuse were studied with a numerical model for both packaging types, applying effective thermal properties of the sandwich-structured CP box. The purpose of the model was to cost effectively improve the packaging design. A satisfactory agreement between numerical results and experimental results was obtained. [article] Experimental and numerical modelling comparison of thermal performance of expanded polystyrene and corrugated plastic packaging for fresh fish = Comparaison expérimentale et numérique de la modélisation de la performance thermique du polystyrène expansé et de la matière plastique ondulée utilisés comme emballage du poisson frais [texte imprimé] . - 2012 . - pp. 573–585. Langues : Anglais (eng) Français (fre) in Revue internationale du froid > vol 34, issue 2 (mars 2011) . - pp. 573–585 Catégories : 621.5 : Technique pneumatique, du vide, des basses températures Mots-clés : Produit alimentaire réfrigéré; Variation de température; Isolation; Emballage; Modèle-transfert de chaleur Index. décimale : 621.56 Technique des basses températures : réfrigération, pompe à chaleur Résumé : Experiments were carried out to compare the thermal performance of wholesale fresh fish boxes made of corrugated plastic (CP) and expanded polystyrene (EPS). Free standing boxes containing whole, fresh fillets were exposed to dynamic thermal loads. The chilling effect of frozen ice packs was studied by including them in some of the boxes. The frozen ice packs proved efficient for protecting fresh fish fillets against temperature abuse. Furthermore, the results show that the insulating performance of EPS is significantly better than the insulating capacity of CP. Maximum fish temperature of 16.1 °C (CP) and 11.0 °C (EPS) were recorded inside the thermally abused boxes without ice packs, initially at 1.9 to 2.1 °C and stored for 6.1 h at a mean ambient temperature of 19.4 °C. The fish temperature distributions during thermal abuse were studied with a numerical model for both packaging types, applying effective thermal properties of the sandwich-structured CP box. The purpose of the model was to cost effectively improve the packaging design. A satisfactory agreement between numerical results and experimental results was obtained.