AEC WD 350 through WD3000 Dehumidifying Dryers - Manual (Page 9)

1-4 Standard Features
Dual desiccant beds
Electric air control valve
13X desiccant
Up to 400ºF (204ºC) drying temperature range
1-5 Options
Options can tailor your AEC/Whitlock dehumidifying dryer to meet the exact requirements of
the drying task being performed.
Dew point monitor indicates dryer efficiency.
Electrical disconnect.
Seven day timer to allow programmable dryer startup.
Communications to meet customer needs.
Drying hoppers come in many sizes and mounting configurations.
Conveying equipment to transport material to and from the drying system.
1-6 The Closed Loop Drying System
AEC/Whitlock dryers force hot, dry air through the resin in the drying hopper, where the air
picks up moisture from the material and is drawn back to the dryer.
In the dryer, a desiccant bed strips moisture from the air. The dried process air is then re-heated
and delivered back into the drying hopper to dry material again.
This system is a closed loop, because ambient (outside) air is never introduced into the process
air. AEC/Whitlock uses the closed loop system because the process air is typically much drier
than ambient air, even after carrying moisture out of the plastic resin. Recycling process air
maintains drying efficiency at a consistently high level.
Page 8 WDMR and WDFR Series Dehumidifying Dryers