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How the dehumidifier works
The average temperature in a crawl space is low, something which makes the adsorption principle
used in the CTR 300TT2 superb compared to dehumidifiers whose efficiency falls significantly
when the temperature falls. The adsorption principle thus provides effective dehumidification at
temperatures well below freezing.
The fixed desiccant that is used in CTR 300TT2 is silica gel, which can be regenerated an almost
unlimited number of times. Silica gel is a crystal with many small microscopic pores giving the
crystal's walls a massive surface area. A gram of this substance has a moisture absorption areas of
500 - 700m
2
, which means that the desiccant in a CTR 300TT2 has a total drying area of approx.
75,000m
2
. Silica gel can absorb a lot of moisture, up to 40% of its own weight. It is not water
soluble and therefore cannot be washed away or blown out with exiting airflows.
The dehumidification process
The desiccant is placed in a rotor (1). The air to be dried is sucked in through the inlet (2) by means
of a process air fan (3).
The air passes a filter and then the drying rotor, after which the dehumidified air goes through the
dry air outlet (4) to the area to be kept dry. The rotor has axially directed air ducts and consists of
a highly active desiccant, silica gel, bonded in a ceramic structure. The axially directed air ducts in
the rotor give laminar flow with minimal pressure drop.
The rotor rotates by means of a drive motor (5) and a drive belt (6). The moisture that
is adsorbed in the rotor is driven out by a small portion of the process air being heated by the
heater (7) and then passing a smaller part of the rotor, which is thus regenerated and also cleaned
by the countercurrent principle.
The wet air is removed via the outlet (8) to the surroundings.
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