Centrifugal Chiller: Single-stage or Two-stage?

At the 2013 China Refrigeration Expo held in Shanghai in April, U.S.-based Carrier exhibited a centrifugal chiller with a two-stage compressor. Big U.S. manufacturers, namely Carrier, York, and McQuay, have traditionally only offered single-stage centrifugal chillers. Trane, however, is an exception, as its chillers use a direct-drive design and require multi-stage compressors due to the lower impeller revolution.