. Commercial dehydration of fruits and vegetables. Fruit Drying; Vegetables Drying; Fruit Processing; Vegetables Processing. 12 BULLETIN 1335, U. S. DEPARTMENT OF AGRICULTURE COMPARTMENT DRIERS Compartment driers (fig. 5) have a drying chamber divided by partitions into several compartments, each holding one or two stacks of trays. These trays can be handled most conveniently on trucks. Air is carried from the heaters through a main duct, from which por- tions are diverted to each compartment. Circulation in a vertical direction through the tier necessitates a shifting of the trays during dryi
. Commercial dehydration of fruits and vegetables. Fruit Drying; Vegetables Drying; Fruit Processing; Vegetables Processing. 12 BULLETIN 1335, U. S. DEPARTMENT OF AGRICULTURE COMPARTMENT DRIERS Compartment driers (fig. 5) have a drying chamber divided by partitions into several compartments, each holding one or two stacks of trays. These trays can be handled most conveniently on trucks. Air is carried from the heaters through a main duct, from which por- tions are diverted to each compartment. Circulation in a vertical direction through the tier necessitates a shifting of the trays during drying, inasmuch as the contents of the trays farthest from the source of the air supply dry more slowly than the material on near-by trays. For this reason circulation of the air across the trays is prefer- able. The air is discharged from each compartment into a recircula- tion duct, to be either reheated or discharged from the drier without passing through any other Fig. 5.—Compartment drier TUNNEL DRIERS In tunnel driers (fig. 6) the drying is done in a long chamber or tunnel, in which both the materials and the air move horizontally for the most part. A concrete slab floor, hollow-tile walls, and a rein- forced-concrete ceiling make a durable and fireproof drier. Many driers, however, have wooden floors and double walls and ceilings of tongue and groove flooring nailed to a skeleton framework of 2 by 4s. Although the dimensions and capacity of the tunnels vary, a typical tunnel is about 40 feet long, 6 feet wide, and 6 feet high, capable of holding a single line of 10 trucks, each truck carrying a double stack of trays 23^ feet square. Handling the trays on trucks is more. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Nichols, P. F. (Paul Frothingham), 1893-1934. Washington, D. C. : U. S.
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