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Both this procedure are used to lower the tempearture of defined area .
Air Refrigeration cycles are used in aircraft regrigeration system whether its passenger plane or fighter plane or rockets .
Some of the reasons why it is preferred over VCRS are mentioned below -
1. Availabilty of very high pressure air .
2. Heat carrying capacity of air is very small , since it does not frequently changes its phases due to it remains mostly in gaseous phase .
3. Mostly we need no seperate compressor , since work from compressor of jet engine can be used to run the cycle .
Air is non flammable , non toxic and very much reliable .
5. Cheap source