Multistage Centrifugal Compressor

Centrifugal compressors use one or more impellers to compress the refrigerant. A multistage compressor uses 2 or 3 impellers to increase refrigerant pressure in steps, rather than to increase pressure in a single impeller. Compressed refrigerant vapor flows from the first stage outlet to the second suction. After the “accelerated” refrigerant vapor exits from the last impeller, it is collected in the compressor volute and flows to the conden