Aircraft Air Conditioning Pack

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

Aircraft air conditioning pack.

There are two types of air conditioning systems commonly used on aircraft. On other aircraft douglas aircraft dc 9 series the a c packs are located in the tail. Pressurization is achieved via the air pressurization system. The air conditioning system is based on an air cycle machine acm cooling device which is mostly used in turbine powered aircraft.

Usually air conditioning packs are located left and right wing to body area near the main landing gear of an airplane. A water separator collects water condensed by the cooling process to avoid icing. 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. Vapor cycle air conditioning systems are often used on reciprocating aircraft.

If the apu is not available a ground source of air can be used to supply the aircraft. Pack flow compressor outlet temperature by pass valve position and pack outlet temperature. Depending on the airport facilities this is either a preconditioned air system supplied by the airport or a mobile generator unit is used to pump air. Inside the pack bleed air is cooled by ram air through heat exchangers and an air cycle machine.

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. 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. However ram air can only be used at a level below 10 000ft. An ecam electronic centralized aircraft monitor constantly measures the following parameters of the conditioning system.

On aircraft which use bleed air for the air conditioning it also provides a flow of air to feed the packs. Apu or engine 5 th and if necessary 9 th stage bleed air hot is pre cooled by fan air before entering the pack.