The air cycle refrigeration was the principle form of mechanical refrigeration in the second half of the 19th
century. However, the air cycle refrigeration began its decline after the introduction of synthetic refrigerants in the
early 1930s. Several disadvantages prevented air from being used as a working fluid in refrigeration. These included
low volumetric refrigerating effect, which may lead to a large compressor, and poor energy efficiency as a result of
low efficiencies of compressors and expanders. Recently, with CFCs and HCFCs problems becoming pressing
issues, air, as a natural refrigerant, has been attracting more and more attention.
The air cycle refrigeration was the principle form of mechanical refrigeration in the second half of the 19th
century. However, the air cycle refrigeration began its decline after the introduction of synthetic refrigerants in the
early 1930s. Several disadvantages prevented air from being used as a working fluid in refrigeration. These included
low volumetric refrigerating effect, which may lead to a large compressor, and poor energy efficiency as a result of
low efficiencies of compressors and expanders. Recently, with CFCs and HCFCs problems becoming pressing
issues, air, as a natural refrigerant, has been attracting more and more attention.
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