Compressors and Fans are essentially pumps for gases. Although they differ in construction from liquid handling machines, the principles of operations are similar.Gases being compressible, a large portion of the energy of compression is dissipated in form of heat to the gas. This limits the operation of the compressor unless suitable cooling is effected. Various gas machines can be classified depending upon their compression ratio i.e. ratio of final pressure P2 to suction pressure P1.
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