How the Airconditioning in Aircraft works ?

the word Air conditioning refers to the cooling and dehumidification of indoor air for thermal comfort.the term can refer to any form of cooling, heating, ventilation or disinfection that modifies the condition of air.air conditioning applications is divided into comfort and process.Comfort applications and process applications.air conditioning can be used for many types of transportation - motor-cars and other land vehicles, trains, ships, aircraft, and spacecraft.Aircraft air conditioning. Although nominally aimed at providing comfort for passengers and cooling of equipment, aircraft air conditioning presents a special challenge because of the changing density altitude associated with changes in altitude, humidity and temperature of the outside air

An air conditioning system uses available compressed air (e.g., from an engine compressor) and feeds it into a cascade of two decompression compressors, a heat exchanger and a moisture precipitator which discharges into the cabin. Air is bled off the cabin to maintain a particular pressure, but a return flow for air from the cabin is also maintained, such air being cleaned and compressed, chilled and mixed with the tapped air. The mixing stage is provided upstream of the second turbine but downstream of the first one. The compressed return flow air is either cooled before mixing in a separate cooling circuit, or is added to the tapped air flow upstream of the heat exchanger. Turbines and heat exchanger are bypassed individually or jointly for temperature control. One or both turbines drive the compressor for the return flow of air, both turbines or the other one drive normally a blower for drawing air through the heat exchanger as recipient for thermal energy.