Aircraft Air Conditioning Pack

Air cycle air conditioning is used on most turbine powered aircraft.

Aircraft air conditioning pack.

An air cycle machine acm is the refrigeration unit of the environmental control system ecs used in pressurized gas turbine powered aircraft normally an aircraft has two or three of these acm. A water separator collects water condensed by the cooling process to avoid icing. Inside the pack bleed air is cooled by ram air through heat exchangers and an air cycle machine. Vapor cycle air conditioning systems are often used on reciprocating aircraft.

Pack flow compressor outlet temperature by pass valve position and pack outlet temperature. Each acm and its components are often referred as an air conditioning pack the air cycle cooling process uses air instead of a phase changing material such as freon in the gas cycle. If the apu is not available a ground source of air can be used to supply the aircraft. On aircraft which use bleed air for the air conditioning it also provides a flow of air to feed the packs.

On other aircraft douglas aircraft dc 9 series the a c packs are located in the tail. Apu or engine 5 th and if necessary 9 th stage bleed air hot is pre cooled by fan air before entering the pack. Cabin temperature control system the temperature and quantity of the air must be controlled to maintain a comfortable cabin environment at all altitudes and on the ground. The air conditioning system is based on an air cycle machine acm cooling device which is mostly used in turbine powered aircraft.

There are two types of air conditioning systems commonly used on aircraft. Pressurization is achieved via the air pressurization system. Usually air conditioning packs are located left and right wing to body area near the main landing gear of an airplane. However ram air can only be used at a level below 10 000ft.

In some designs they are installed in the wing to body fairing between the two wings beneath the fuselage. An ecam electronic centralized aircraft monitor constantly measures the following parameters of the conditioning system.