4 MASS. EXPERIMENT STATION BULLETIN 404 



The heat requirement is also affected by the moisture content of the raw mate- 

 rial, and all of these factors must be taken into consideration in the construction 

 of the dehydrating unit. For successful operation, therefore, the heating capacity 

 of the dehydrator must be adequate for all types of products. 



Effects of Humidity 



From the precedmg discussion the importance of humidity conditions in the 

 dehydration process is obvious, since the moisture-carrying capacity of the air 

 is directly proportional to the relative humidity. The higher the temperature of 



Figure 1. Naliu-al Draft Dehydrator — Type 1. 



