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adsorbed moisture, it is exposed to a second air stream at an
elevated temperature (reactivation). This causes the moisture
to be driven out of the desiccant preparing it for more
moisture adsorption. This process is done on a continuous
basis, providing a constant drying process. The two air
streams (process and reactivation) are separated by seals,
which contact the desiccant media. Figure 1 illustrates the
relationship of the seals and airflow pattern. The dehumidifier
is designed with the two air streams flowing in opposite
directions (counter flow) thereby maximizing the energy
efficiency of the equipment.
2.1 How the Phoenix 4800E Works
The Phoenix 4800E has two separate air streams that run
through it – Process and Reactivation (Fig. 1).
Process Air Stream:
P1
– 4800 CFM of air enters the machine (Process Air Inlet)
and...
P2
– ...water vapor from incoming air is deposited (adsorbed)
on the desiccant wheel.
P3
– 4800 CFM of dry air exits the machine (Process Air
Outlet).
Reactivation Air Stream:
R1
– 2000 CFM of air enters the machine (Reactivation Air
Inlet) and...
R2
– passes over the heater coils.
R3
– Water vapor is picked up (desorbed) from the desiccant
wheel by the hot air and...
R4
– ... 2000 CFM of wet air exits the machine (Reactivation
Air Outlet).
3 Installation
Proper installation is critical to the performance of the
Phoenix 4800E. Follow the guidelines below to maximize
service life and performance.
3.1 Inspection
Thoroughly inspect the machine to insure no damage has
occurred during shipping or on the job site.
3.2 Location
Note the following precautions when locating the Phoenix
4800E:
The 4800E is designed to be used indoors or outdoors.
If the humid area is very large, dehumidification can be
improved by adding an outlet duct to circulate process air to
stagnant areas.
3.3 Set-Up
When conditions warrant the use of a desiccant dehumidifier,
use one of the setups described below to achieve efficient
drying, while avoiding secondary damage. Review Section
2.1 to understand the desiccant drying process. Always
ensure that the Reactivation Outlet duct is vented to the
outdoors to minimize the possibility of secondary damage.
Neutral Pressure Setup
Many drying applications require neutral pressure operation.
In this setup, the Process Air Inlet pulls air from the affected
area (drying chamber) and returns dried, processed air to the
affected area via the Process Air Outlet.
The Reactivation Air Inlet and Outlet are both ducted to the
outdoors (or left open if the unit is set up outside).
Positive Pressure Setup
For Positive Pressure operation, the Process Air Inlet pulls air
from outside the drying chamber, while the Process Air Outlet
is ducted into the chamber.
The Reactivation Air Inlet and Outlet are both ducted to the
outdoors (or left open if the unit is set up outside).
Cabinet Divider
and Seals
Reactivation Air Outlet
Process Air Inlet
Heater
Principle of Operation
Process Air Outlet
Desiccant Wheel
Desiccant Wheel
Drive and Chain
Reactivation Air Inlet
