Trotec TTR 2000 Mode D'emploi page 42

Regeneration air
The regeneration air (5) is also sucked in with its own fan and
guided through the purging sector (3). During dehumidification
the desiccant wheel warms up as a result of the released
desiccation heat and the regeneration heat. The purging
sector (3) serves the purpose of heat recovery and for cooling
the desiccant wheel, leading to a reduced energy input and
improvement of the dehumidification performance – especially
at lower dew points. Whilst flowing through the heater
battery (7) the air is heated to approx. 100 °C to 140 °C
(depending on the intake temperature) and at the same time the
relative humidity is extremely reduced.
In passing through the regeneration sector (2), the thusly
prepared air now again absorbs the moisture retained by the
silica gel (desorption). Then the extremely humid regeneration
air (8) is discharged to the outside via the humid air outlet.
Schematic diagram
No. Designation
1 Dehumidification sector
2 Regeneration sector
3 Purging sector
4 Process air inlet
5 Regeneration air inlet
6 Dry air outlet
7 Heater battery
8 Humid air outlet (regeneration air)
5
Design configuration and components
rotor
The desiccant dehumidifier works with a desiccant wheel (rotor
A) which is composed of layers of smooth and corrugated non-
woven fabric with chemically bonded silica gel. Thus created is
a honeycomb structure with a large number of axial air ducts
with a large surface and direct connection to the inner pore
structure of the silica gel.
On account of the desiccant wheel's good mechanical and
physical properties no silica gel is discharged. It may be
supplied with saturated air with a relative humidity of up to
100 % but not with water drops. The rotor is incombustible.
Rotor drive
The rotor is driven by an electric gear motor.
The power is transmitted by means of synchronized pulley and
timing belt.
Rotor rotation control
The device is equipped with a rotation control for an early
recognition of a possible rotor standstill.
Rotor bearing
The rotor is mounted on a stainless steel axle with
maintenance-free plain bearing bushes.
Rotor sealing
An automatically clearance-compensating gasket system seals
the rotor and the individual air sectors against one another.
Filter
Air filters are located in each individual air inlet – depending on
the field of application designed either as coarse or fine filter for
removing the dust in the air currents.
Fans
Used are radial fans or mixed-flow fans with energy-saving EC
motors. For an easy adjustment of the volumetric flow rates a
potentiometer is located behind the front cover. Therefore, the
fan speed for process air and regeneration air can be adjusted
according to the specifications. Hence, additional throttle valves
in the air lines are rendered redundant.
desiccant dehumidifier TTR 2000 / TTR 2800 / TTR 3700 EN