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In a large transport aeroplane the main temperature reduction of the conditioned air is achieved in…

  • A
    the heat exchangers.
  • B
    an evaporator.
  • C
    an expansion turbine.
  • D
    a condenser.

Refer to figure.
AIR CYCLE MACHINE
Air Cycle Machines are ideally suited for turbine aircraft due to the supply of already compressed bleed air. Often referred to as "air conditioning packs" or "bootstrap system".
In Air Cycle Machines, high-pressure bleed air from the engines is first pre-cooled in the primary heat exchanger. The bleed air is then compressed in the compressor section and is then fed through to the secondary heat exchanger to remove as much heat as possible before being expanded and introduced to the turbine section which is used to drive the compressor. After passing through the turbine section, the air is then ducted through a water separator to remove excess moisture from the conditioned air before it enters the cabin and cockpit via a one way check valve. Finally, the air passes through a humidifier to increase the moisture content of the conditioning air.

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