VEGETABLE AND FRUIT DEHYDRATION 



95 



Table 8. — Suggested dry-bulb and icet-bulb temperature changes for cabinet 



dehydration pilot run 



Vegetable 



Original 

 weight re- 

 duced to 

 j number of 

 times dry- 

 weight i 



Dry-bulb 



temperature 

 drop 



Wet-bulb 



temperature 



drop 





iS... 



°F. 

 f 200-170 

 I 170-155 

 1 155-150 

 [ 150 

 [ 200-175 

 1 175-170 

 1 170-160 

 I 160 

 \ 165-155 



155-145 



145-140 



140-130 

 I 130 

 f 200-180 

 I 180-160 

 ) 160-155 

 I 155 

 f 200-180 

 I 180-160 

 ] 160-150 

 I 150 

 f 200-175 

 I 175-155 

 ] 155-150 

 [ 150 

 f 165-160 



160-150 

 \ 150-140 



140-135 

 I 135 

 f 165-155 



155-150 

 \ 150-135 



135-125 

 { 125 

 f 200-185 

 I 185-180 

 1 180-170 

 I 170 

 [ 200-175 

 \ 175-150 

 I 150 



180-170 

 <^ 170-165 

 I 165 

 f 180-165 

 1 165-155 

 | 155-150 

 [ 150 

 f 180-160 

 I 160-155 

 1 155-150 

 I 15C 

 1 180-160 



160-150 

 150 

 f 200-175 

 1 175-165 

 ] 165-160 

 I 160 



°F. 

 120-105 





2 



[1.5. 



105-95 





95-90 





f4 



90 

 120-110 



Sweetpotatoes — 



3 



110-105 



[2- ..... 



105-95 





fc- 



95 



100-95 

 95-90 





3 ... .: 



90 85 









12 



(4 .. 



8.5-80 

 80 

 120-110 





3.. .. 



110-100 





[2 :. 



100-90 





(4 



90 

 120-110 





k__ 



110-100 





[2 



100-90 

 90 



120-110 

 110-105 





k::::::::::: 



105-90 

 90 



100-95 

 95-90 

 90-85 







[2 



85-80 





f6 . 



80 

 100-95 





4 



95-90 



3 . 











[2 



85-80 





13 



80 

 120-115 





2 



115-110 





I1.5— ..:./ 



110-100 





f3 



100 



120-110 





{2 . . 











/3 L. 



90 

 110-105 





k_.. ::::■:. 



(3__ 







95 



110-100 





2 



1.1.5- 



100-95 





95-90 





(3 



90 



110-100 





h 



100-95 





11.5::. 



95-90 





/3 -- 



90 

 110-100 



\2...... . .. 











[3 



90 

 120-110 



Parsnips . ... ... . 



k. - . 



110-100 





I1.5: _: ".: 



100-95 







95 



1 Dry weight = expected dry weight as determined in first pilot run. 



recorded, and in accordance with table 8 the dry- and wet -bulb tem- 

 peratures are lowered to 150° and 90° in the order named. Dehydra- 

 tion is then continued at these temperatures until complete. 

 Suppose that the second test gave the following results : 



r» , .. . -. Time in 



Reduction 111 pounds : minutes 



20 to 12.6 42 



12.6 to 8.4 33 



8.4 to 6.3 25 



6.3 to completion 250 



