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Zonal Drying™ System The essence of comfort

How to save fuel, drop weight and improve the environment.

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Inside the aircraft. During flight the extreme of temperature creates condensation at an alarming rate. Each passenger exhales an average of 100 gram of water per hour. During a long-haul flight this adds up to a considerable amount, causing damage to the insulation, and nuisance to both passengers and crew.

As well as outside. Condensation can increase the aircraft weight by over half a ton, depending on the number of passenger, type of operation, aircraft and climate zone. This extra load results in higher fuel consumption, affecting the environment in a negative way. The good news is that there is a way to drop dead weight, save fuel, reduce emissions and make people on board more comfortable – all in one go. Turn the page and see how!

How to lose

200 kg or more?

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The Zonal Drying™ System prevents condensation in modern aircraft by combating the root cause. Less condensation means less weight resulting in lower fuel consumption and emissions. And, in the long term, increased lifetime of aircraft components and insulation. The equipment required for a Boeing 737 NG aircraft weighs only 29 kg.

Who benefits?

The Planet

Lower fuel consumption. Less emissions. The less fuel burned the cleaner the atmosphere. Imagine saving up to 65 tons of CO2 – per aircraft per year! – as is the case with a narrow-body aircraft. Or up to 160 tons with a wide-body aircraft in regular service. The calculations further back also show significant reductions of nitrogen oxides, hydrocarbons and carbon oxide.

The airline

$$$ - Better total economy Our calculations, based on experience from actual installations and reports from operators of our systems, show that the payback period for a Zonal Drying™ System in an aircraft can be as short as 1 to 2 years, depending on the type of operation and aircraft. The payback period is shortest for operators with high aircraft utilization and high passenger load factors. The values of operational reliability, passenger comfort and the effects on the environment are not even taken into account.

In around two years, our system will have paid for itself. In twenty, it still saves you money.

The airplane

Less electrical failures. Many of the electrical wires in the aircraft are located in the space between the inner lining and outer skin – right where condensation accumulates. This triggers warning signals and short circuits in sensitive equipment, resulting in delays and component replacements – if not worse.

Longer life cycle. Corrosion mainly affects the areas around aircraft windows, doors, antennas and belly structures. Floor beams and electrical connectors are also exposed. This means extra expense for the airlines, since they often have to replace structural parts at D-checks. If moisture is removed, the risk of accumulating corrosion on the airframe is minimized.

Inside an aircraft, rain should be the last thing to worry about.


No "rain in the plane". During take-off and landing, passengers and crew are often exposed to what is commonly called �rain in the plane�. Especially during descent or take-off, when water seeps along fissures in ceiling panels and people on board are exposed to dripping water. This is caused by water floating on surfaces on top of the overhead panels. It is condensed water that has not been drained out of the aircraft. This is not news. The news is that you can actually prevent this from happening.

The crew

Effective insulation. Condensed water permeates the insulation making it heavier and significantly reducing its insulation effect. When people on board feel cold draughts at windows and doors, this is one of the explanations. Also, since wet insulation is the perfect environment for mould, fungus and mildew, passengers as well as crew and maintenance staff may develop allergic reactions. During maintenance, parts of the insulation may have to be dried or replaced. This entails extra costs for the airlines, while still only providing a temporary solution to the problem – once the aircraft re-enters service the insulation will soon be soaked again.

Mould. The only thing that benefits from wet insulation.

The competitive advantage. In terms of fuel. Up to 52 tons per aircraft per year.* In environmental terms. Up to 160 tons of CO2 per aircraft and year. Not to mention other emissions such as: NOx, HC and CO.* In maintenance terms. Less downtime due to repairs, man-hours and material costs substantially reduced. In terms of competitive strength. Better climate on board. Better work environment. Better adherence to flight schedule. *in case of wide-body aircraft No matter how you look at it – installing a Zonal Drying™ System gives you a competitive advantage over airlines who keep their ”rain in the plane”.

• Carbon dioxides (CO2). Contribute to the greenhouse effect that results in an increase of the earth’s average surface temperature. • Nitrogen oxides (NOx). Contribute to acidification and over fertilization of land and water. • Hydrocarbons (HC). Ground-level ozone that is created by reaction with sunlight can harm vegetation and affect human health. • Carbon oxide (CO). Detrimental to human health.

A human being exhales approx. 10 cl water per hour. Imagine how many decanters you can save on an overseas flight!

Let's calculate!

Example Boeing 737NG Can save

65 tons CO * 21 tons less fuel consumption* 2

reduced emissions – per aircraft per year. CO2 65 ton NOX 190 kg HC 35 kg CO 460 kg *Based on 3,000 flight hours per year. 200 kg less weight gives a fuel saving of 7 kg per flight hour with a 90% load factor, fuel efficiency factor of 3.5%. Source: www.luftfartsverket.se (Figures are approximate)

Example Airbus A330-200

Can save

165 tons CO * 52.5 tons less fuel consumption* 2

reduced emissions – per aircraft per year. CO2 165 ton NOX 630 kg HC 1 kg CO 85 kg *Based on 5,000 flight hours per year. 300 kg less weight gives a fuel saving of 10.5 kg per flight hour with a 90% load factor, fuel efficiency factor of 3.5%. Source: www.luftfartsverket.se (Figures are approximate)

svart = 85% PMS 7545 turkos C 93 M 0 Y 24 K 0 PMS 313 ljus-blå, 40% av: C 100 M 28 Y 24 K 0 PMS 277

The Zonal Dryer principle Our system takes care of the root cause and is not a temporary fix.

The Zonal Drying™ System effectively removes moisture using established industrial technology. The system takes air from the crown area or cargo area and feeds it through zonal dryer units to remove moisture. It then circulates the dry air between the cabin and the outer skin of the aircraft using a specially designed piccolo duct. This lowers the dew point in the crown area preventing the condensation process from occuring, thus keeping the insulation blankets dry. Depending on aircraft type, the Zonal Drying™ System consists of one or more zonal dryer units installed at strategic points in the aircraft. Each unit features a slowmoving rotor impregnated with silica gel.

CTT Zonal Dryer Absorption rotor

Dry air

Air intake Moist air Fan


Rotor motor

A 4-pole inlet fan feeds two separate airstreams into the rotor. The rotor absorbs humidity from one of the airstreams and processes the air, before releasing it as dry air. Electric heaters warm up the second air stream before it enters the rotor. Passing through the rotor, the heated air absorbs humidity collected from the processed air. The regenerated air is then fed into the aircraft re-circulation system or dumped overboard through the out-flow valve. The system is activated whenever the aircraft is powered up. Furthermore, it is run as on condition with an MTBF of 15 000 flying hours.

svart = 85% PMS 7545

Installation layouts

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ljus-bl책, 40% av: C 100 M 28 Y 24 K 0 PMS 277

A319 Installation with one Zonal Dryer.

Boeing 737-700 Installation with one Zonal Dryer.

Boeing 757-200 Installation with one Zonal Dryer.

Wide Body installation Wide Body Installation ZD in Crown Area in Crown Area

Narrow Body installation Narrow Body Floor Installation ZD in Below Below Floor

Regenaration (humid) air outlet close to the recirculation filter or outflow valve

Aircraft type

Total system Number The dry air is being distributed throughout the crown area using weight of dryers a piccolo ducting system



22,0 kg




28,7 kg




28,7 kg



Power Consumption per Zonal Dryer DC current

0,3 amps

AC current

2040VA (pf 0,97)

AC inrush current

14,4 amps/phase

AC current

6,5 amps/phase

For Airbus and Boeing Wide body Aircrafts or other types of aircrafts please contact us for more information.

Bombardier CRJ200






A330 -200/-300 , A340-200/-300/-500/-600




BFE on Boeing 737

The Zonal Drying™ System is BFE equipment on the Boeing 737NG-700/800.

Standard on Boeing 787

The Zonal Drying™ System is standard on the Boeing 787, i.e. it is installed in all aircraft of this type.

SFE option on Airbus A350 XWB The Zonal Drying™ System is avalible on the Airbus A350 XWB.

Humidity in balance. Our mission is to create a better climate inside the aircraft, thereby providing economic benefits to the airline. The key is to balance humidity levels on board. Our concept increases passenger wellbeing, contributes to a better environment and improves airline economy, simultaneously. We call it ”humidity in balance”.

For additional information, please contact: Peter Landquist VP Sales, Marketing & Customer Support Phone: +46 (0)155 20 59 02 | Mobile: +46 (0)70 665 2445 | E-mail: peter.landquist@ctt.se Anton Nöffke Director Sales, Marketing & Customer Support - Asia Pacific & Middle East Representative Phone: +60 (0) 12 525 28 64 | E-mail: anton.noffke@ctt.se Per Gustafsson Sales, Marketing & Customer Support Phone: +46 (0)155 20 59 03 | Mobile: +46 (0) 70 214 89 05 | E-mail: per.gustafsson@ctt.se

CTT Systems AB (publ.) Box 1042 SE-611 29 Nyköping Phone: +46 155-20 59 00 Fax: +46 155-20 59 25 E-mail: ctt@ctt.se www.ctt.se

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CTT Systems Zonal Drying System  

CTT Systems Zonal Drying System