[article] 
inRevue internationale du froid > vol 32, Issue 2 (2009) . - pp. 220-234

Titre :	Air velocity characteristics within vented pallets loaded in a refrigerated vehicle with and without air ducts
Titre original :	Caractéristiques de la vitesse de l'écoulement d'air à l'intérieur de palettes munies de ventilation chargées à bord d'un véhicule frigorifique avec ou sans gaines d'air
Type de document :	texte imprimé
Année de publication :	2011
Article en page(s) :	pp. 220-234
Langues :	Anglais (eng) Français (fre)
Catégories :	621.5 : Technique pneumatique, du vide, des basses températures
Mots-clés :	Transport frigorifique  Palette  Modélisation  Dynamique numérique des fluides
Index. décimale :	621.56 Technique des basses températures : réfrigération, pompe à chaleur
Résumé :	During transport using refrigerated vehicles, this being a vital link in the cold chain, the maintaining of even temperature throughout the cargo is essential in order to preserve the quality, safety and shelf life of perishable food. Within the refrigerated container, the temperature level and its homogeneity are directly governed by airflow patterns. The design of the air-distribution system should allow these airflows to compensate heat fluxes exchanged through the insulated walls or generated by the products. In this paper, a reduced-scale model and CFD predictions were used to investigate experimentally and numerically the airflow patterns within a typical refrigerated truck configuration loaded with vented pallets filled with spherical objects. The experiments were carried out using a laser Doppler velocimetry and thermal sphere-shaped probes located inside the pallets. The aim was to investigate air velocity characteristics above and within pallets. The performance of ventilation was characterized with and without supply air duct systems. Both configurations are extensively used in refrigerated transport. Full-scale measurements were also performed within a load of fruit during transport in a refrigerated truck in order to evaluate the temperature distribution under given operating conditions. The numerical modelling of airflow was performed using the computational fluid dynamics (CFD) fluent code and the Reynolds Stress Model (RSM) turbulence model. Numerical and experimental data make it possible to evaluate the air ventilation levels and their heterogeneity between the pallets. The numerical predictions show reasonable agreement with experimental data. The studied supply air duct system improves significantly the homogeneity of ventilation in the vehicle.

[article] Air velocity characteristics within vented pallets loaded in a refrigerated vehicle with and without air ducts = Caractéristiques de la vitesse de l'écoulement d'air à l'intérieur de palettes munies de ventilation chargées à bord d'un véhicule frigorifique avec ou sans gaines d'air [texte imprimé] . - 2011 . - pp. 220-234.
Langues : Anglais (eng) Français (fre)
in Revue internationale du froid > vol 32, Issue 2 (2009) . - pp. 220-234

Catégories :	621.5 : Technique pneumatique, du vide, des basses températures
Mots-clés :	Transport frigorifique  Palette  Modélisation  Dynamique numérique des fluides
Index. décimale :	621.56 Technique des basses températures : réfrigération, pompe à chaleur
Résumé :	During transport using refrigerated vehicles, this being a vital link in the cold chain, the maintaining of even temperature throughout the cargo is essential in order to preserve the quality, safety and shelf life of perishable food. Within the refrigerated container, the temperature level and its homogeneity are directly governed by airflow patterns. The design of the air-distribution system should allow these airflows to compensate heat fluxes exchanged through the insulated walls or generated by the products. In this paper, a reduced-scale model and CFD predictions were used to investigate experimentally and numerically the airflow patterns within a typical refrigerated truck configuration loaded with vented pallets filled with spherical objects. The experiments were carried out using a laser Doppler velocimetry and thermal sphere-shaped probes located inside the pallets. The aim was to investigate air velocity characteristics above and within pallets. The performance of ventilation was characterized with and without supply air duct systems. Both configurations are extensively used in refrigerated transport. Full-scale measurements were also performed within a load of fruit during transport in a refrigerated truck in order to evaluate the temperature distribution under given operating conditions. The numerical modelling of airflow was performed using the computational fluid dynamics (CFD) fluent code and the Reynolds Stress Model (RSM) turbulence model. Numerical and experimental data make it possible to evaluate the air ventilation levels and their heterogeneity between the pallets. The numerical predictions show reasonable agreement with experimental data. The studied supply air duct system improves significantly the homogeneity of ventilation in the vehicle.