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| How it works |
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The Zonal Drying™ System takes air, removes the moisture, and blows the air between the cabin and the aircraft's outer skin. There, a weak over-pressure is created by a barrier of dry air, which dries the insulation blankets. At the same time, the relative humidity of the air coming into contact with cold surfaces is reduced, eliminating condensation.
The technology is based on Munters' well-known moisture removal technology, which is already used in the military aviation industry with land-based equipment. CTT has refined this technology by building small, lightweight drying units, which can be installed for permanent operation in an aircraft. A Zonal Dryer consists of a fan, a heater and a rotor.
The rotor is made from glass fibre and is impregnated with silica gel, a substance with excellent properties for absorbing and dissipating moisture. Two separate airstreams are led through the slowly moving rotor. One, comprising about 80 percent of the air, passes through the rotor for drying. The dry air is then led to the area to be dried. The other 20 percent of the airstream is warmed before passing through and drying the rotor. This moist air is re-circulated in the cabin via the aircraft's air conditioning system or let overboard through an outflow valve.
Depending on the aircraft type, the Zonal Drying™ System is either fitted in the crown area or beneath the cabin floor. The system remains in operation as long as the aircraft has electric power, in other words during flight and most of the time on the ground. The Zonal Drying™ System has been adapted and installed in various aircraft types. |
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