Aircraft operate under extreme climatic conditions where ambient temperature varies from below -55 °C to about 50 °C, the ambient pressure of about 150 hPa to 1050 hPa and specific humidity varies from virtually dry to saturation. It is necessary to provide comfortable conditions for aircraft crew members and passengers as well as to provide favourable environment for the instruments and equipment to operate accurately and efficiently. To achieve this, aircraft are equipped with an Environment Control System (ECS). The primary role of the ECS is that it must pressurize the aircraft cabin to a nominal by today's standards of approximately 6000 to 8000 ft equivalent atmosphere, and maintain its temperature within tolerable limits and therefore to protect the occupants of the aircraft from the extreme conditions of flying at high altitudes. A major challenge here is the variety of heat loads such as sunlight, heat release by the passengers, lighting, in-flight entertainment (IFE), and equipment in the galley and in the avionics. In particular during the flight, heat released by the above mentioned heat sources must be removed sufficiently, preferably without a large impact on fuel consumption. Numbers of aircraft subsystems are involved in meeting the requirements. Pressurized bleed air is provided by the aircraft engine which is then distributed by a bleed air manifold system and then conditioned and distributed in the aircraft cabin by the ECS. This bled air from the engine is used to pressurize, ventilate and to heat or cool the aircraft cabin. The only exception to this system to date is the Boeing 787 that utilises electrical air compressors to supply the ECS. Air conditioning packs are used to cool and dehumidify the bleed air before it is supplied to the aircraft cabin by the cabin air distribution system. In this paper, an overview of the air conditioning of aircraft cabin and the resulting challenges for cooling to achieve a comfortable environment for passengers and crew is outlined. A modelling approach to simulate hygrothermal behaviour of an aircraft cabin is also illustrated in brief.


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    Title :

    Air conditioning of aircraft cabins - Challenges for the cooling


    Contributors:


    Publication date :

    2011


    Size :

    48 Seiten, Bilder, 7 Quellen


    Remarks:

    (+ 38 S. Folienpräsentation)



    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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