. Commercial cooling of fruits and vegetables. Fruit; Fruit; Vegetables. Fig. 9. Fruit being room cooled in pallet frames. Frames assure uniform spacing for air circulation past pallet sides, and are often used to prevent damage to corrugated containers during multi-pallet stacking. • Well-vented containers which cool almost twice as fast as closed containers at moder- ate velocities (200 to 400 feet per minute). When cooling is complete, air velocity around containers should be reduced to the least that will keep them cool; 10 to 20 feet per minute is often sufficient. Ceiling jets for room c
. Commercial cooling of fruits and vegetables. Fruit; Fruit; Vegetables. Fig. 9. Fruit being room cooled in pallet frames. Frames assure uniform spacing for air circulation past pallet sides, and are often used to prevent damage to corrugated containers during multi-pallet stacking. • Well-vented containers which cool almost twice as fast as closed containers at moder- ate velocities (200 to 400 feet per minute). When cooling is complete, air velocity around containers should be reduced to the least that will keep them cool; 10 to 20 feet per minute is often sufficient. Ceiling jets for room cooling Air in a cooling room tends to follow the path of least resistance from air inlets to air outlets. Consequently, the interior containers in a large stack of containers may receive little air move- ment if another part of the room is empty; or, in a fully loaded room, most of the air may pass over the top of the produce. Better penetration into the stacks can be attained by directing the air downward through large sheet-metal or plas- tic nozzles in a false ceiling (fig. 10). To do this the floor should be marked for placement of loaded pallets in a rectangular pattern, with channels a few inches wide that intersect directly beneath the nozzles. Air from the nozzles then goes down to the floor and spreads in four direc- tions through the channels. Such cooling is con- siderably faster than with undirected air circu- lation. (Advantages here should be weighed against added costs lor the nozzle system and for the additional fan power required.) Bays for cooling and storage For cooling and storage, a single large space is sometimes divided into bays by wing partitions extending outward from the walls (fig. 11). Air is circulated independently in each bay, and provision is made in each bay for high air ve- locity for cooling, and for low air velocity for storage. Movement of produce from a cooling room to a separate storage is eliminated. Thus warm air from newly-introduced
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Keywords: ., bo, bookcentury1900, bookpublisherberkeley, booksubjectvegetables
