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我的文档（My documents） Aircraft air conditioning refrigeration system abstract This paper introduces the development history of the air conditioning system along with the aircraft manufacturing technology, and discusses the future development direction of the air conditioning system by introducing the refrigeration principle of the air conditioning system at all stages. Key word Refrigeration; air conditioning; air circulation; evaporative cycles; sudden collapse. From 1903, the Wright brothers in human history for the first time the aircraft off the ground a few meters high, to the civil aviation fixed wing aircraft operating today at a height of 10000 meters around the bottom of the troposphere to the stratosphere, and even some military aircraft flying at an altitude of twenty thousand metres. In order to enable drivers to survive and improve the comfort of driving, air-conditioning systems on the aircraft, with the flight speed, flight height increased, but also constantly innovation. The function of an air conditioning system is to generate pressure, provide proper temperature, and supply oxygen. 1 Introduction In early August 1909 the French pilot Louis Bleriot success across the English channel, because of the height of the aircraft is not high, the aircraft carrying efficiency is not high. Therefore, in the early days of the flight, the pilot could only fly in a thick warm suit, until the air conditioning system began to load on board in 1936, and the pilots were able to escape from the extreme flight environment. 2 causes of air conditioning system Because the air has weight, it can generate pressure, gravity causes the air distribution is very uneven, the closer the air of the earths surface density is larger, so the atmospheric pressure increases along with the increase of height, atmospheric pressure drop. Low pressure on the human body itself is also harmful, and with the reduction of atmospheric pressure, the body will appear high altitude flatulence, tiss