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REFRIGERATION AIR DEHYDRATOR (TYPE I)
DISTILLING PLANTS

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In the air-to-air heat exchanger, the dehydrated air is raised in temperature by the warm air entering the dehydrator. Heating the air serves to reduce thermal shock as the air enters the system. The exiting dry air flows  into  the  receiver  for  availability  to  the  ship’s  air system. DESICCANT AIR DEHYDRATOR (TYPE II) The desiccant is a drying unit. More practically, desiccant is a substance with a high capacity to remove (adsorb) water or moisture. It also has a high capacity to give off that moisture so the desiccant can be reused. DESICCANT-TYPE  DEHYDRATORS  (fig.  10-30)  are basically  composed  of  cylindrical  flasks  filled  with desiccant. Compressed air system dehydrators use a pair of desiccant  towers.  One  tower  is  in  service  dehydrating the compressed air, while the other is being reactivated. A desiccant tower is normally reactivated when dry, heated air is routed through the tower in the direction opposite to that of the normal dehydration airflow. The hot air evaporates the collected moisture and carries it out of the tower to the atmosphere. The air for the purge cycle   is   heated   by   electrical   heaters.   When   the reactivating  tower  completes  the  reactivation  cycle,  it  is placed in service to dehydrate air, and the other tower is reactivated. REFRIGERATION AND DESICCANT AIR DEHYDRATOR (TYPE III) Some  installations  may  use  a  combination  of refrigeration  and  desiccant  for  moisture  removal.  Hot, wet air from the compressor first enters a refrigeration section, where low temperature removes heat from the airstream and condenses water vapor from the air. Then, Figure 10-30.—Dehydrator (type II). 10-33






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