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AIRFLOW AND HEAT TRANSFER IN A SLOT-VENTILATED ENCLOSURE APPLICATION TO REFRIGERATED TRUCKS

DOI: 10.1615/ICHMT.2008.CHT.320
9 pages

Jean Moureh
UMR Génie Industriel Alimentaire AgroParisTech-Cemagref-INRA, Refrigerating Process Engineering Research Unit, Cemagref - BP 44 - 92163 Antony cedex, France

Serge Tapsoba
UMR Génie Industriel Alimentaire AgroParisTech-Cemagref-INRA, Refrigerating Process Engineering Research Unit, Cemagref - BP 44 - 92163 Antony cedex, France

Denis Flick
UMR Génie Industriel Alimentaire AgroParisTech-Cemagref-INRA, AgroParisTech 16, rue Claude Bernard, 75231 Paris cedex 05, France

Abstract

Slot-ventilated enclosures are extensively used in many engineering applications such as buildings, animal houses and equipment for food transport and storage. The level and the uniformity of parameters such as temperature and humidity are highly governed by airflow patterns and in most of the applications different obstacles also interact with the airflow. The study concerns a slot ventilated long enclosure (L/H=5.3, W/H=1) loaded with porous boxes. This configuration corresponds to a refrigerated truck loaded with crates containing fruit or vegetables. The rectangular inlet section (hi /H=0.056, wi /W=0.4) is near the ceiling and the outlet is located near the floor on the same face. The inlet wall jet is turbulent (Re=1.9·105). An isothermal case and a non-isothermal case (including heat generation in the boxes and heat losses through the walls) were simulated and compared. The Reynolds Averaged Navier-Stokes equations were solved using an RSM turbulence closure model. Darcy-Forchheimer terms were added in the porous medium zone. The Boussinesq approximation was used to take account of mixed convection. The governing equations were solved using the finite volume method. In the isothermal case, the velocity is very low at the rear part of the enclosure. In the non-isothermal case, a secondary recirculation zone appears in the rear part of the enclosure due to free convection and therefore the velocity magnitude is higher. But in the front part, the airflow pattern which reflects the wall jet expansion is very similar because the flow is governed by forced convection. A different inlet configuration, in which the airflow is blown in at three positions along the enclosure, was also investigated. In this case, the ventilation and temperature levels within boxes were found to be more homogeneous.

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