What is Compressor ? Introduction The compressor is a device used to circulate the refrigerant through the system. Type of compressors 1. Rotary Compressor of the rotary type are generally low capacity equipment, used normally in home refrigerators and freezers and not used for air conditioning. 2. Centrifugal Compressor These com presso rs revolve at high speed, and refrigerant is compressed by the application of centrifugal force. These compressor are normally used with refrigerants possessing higher speed volumes, which need lower compression ratios. 3. Reciprocating Compressor A positive-displacement machine that uses a piston to compress a gas and deliver it at high pressure. ...