. Dehydration of Canadian Fruit. 16 PRINCIPLES OF DEHYDRATOR CONSTRUCTION The recirculation tunnel dehydrator is now generally considered the most economic and satisfactory type. Although there are many modifications, the principle involved is essentially the same. The two most popular types in the northwest, namely the filler, and the are quite similar in actual tunnel construction but differ mainly in the method of circulating the heated / ., 11 _*2*.\> -/-o Hot ET~d A Cross section of diagram of Miller type. (A) heating unit, (B) tunnel, (C, D, and E) ventilators in top
. Dehydration of Canadian Fruit. 16 PRINCIPLES OF DEHYDRATOR CONSTRUCTION The recirculation tunnel dehydrator is now generally considered the most economic and satisfactory type. Although there are many modifications, the principle involved is essentially the same. The two most popular types in the northwest, namely the filler, and the are quite similar in actual tunnel construction but differ mainly in the method of circulating the heated / ., 11 _*2*.\> -/-o Hot ET~d A Cross section of diagram of Miller type. (A) heating unit, (B) tunnel, (C, D, and E) ventilators in top of tunnel, (F) moist air outlet, (G) multivane fan, (H) fresh air inlet. Arrows through "C", "D", and "E" indicate course of air. air. Whereas the type, illustrated in the accompanying graph, has the heating unit and fan in a duct below the main tunnel, the Miller type has this equipment at one end of the tunnel as illustrated in the other graph. In the dehydrator the air travels the full length of the tunnel before returning to the heating unit. In the latter type provision is made for part of the air to return to the heating unit at two or more places in the roof of the tunnel (C, D, and E of diagram). This construction allows for an upward movement of air through the trays and increases the uniformity of the The mechanism of a Miller dehydrator. Note the plastered tile construction, oil burners, and electric motor for fan. 1 Patented by the L. Miller Dehydrator Co., Eugene, Oregon. 2 Designed by Prof. E. H. Wiegand, Oregon Experiment Station, Corvallis, 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 Atkinson, F. E; Canada. Dept. of Agriculture. Dominion Experimental Farms Branch. Ottawa : Dept. of Agriculture
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