Each of the four components of the steam-compression systemcompressor, condenser, expansion unit and the evaporator has its special behavior. At the same time, each component is influenced by the conditions imposed by the other members of the " Quartet". Changes in the condenser-water temperature, for example, may change the rate of refrigerant in the compressor, pumps, which, in turn, may require the expansion valve, how to rebuild and refrigerant in the evaporator pressure changes. We must study the components of the vapour-compression cycle alone, the analysis of their efficiency as individuals, and then observe how they interact with each other as a system. Compressor first component analysis. ....
The heart of the vapor-compression system is the compressor. The four most common types of refrigeration compressors are the reciprocating, screw, centrifugal, and vane. The reciprocating compressor consists of a piston moving back and forth in a cylinder with suction and discharge valves arranged to allow pumping to take place. The screw, centrifugal, and vane compressors all use rotating elements, the screw and vane compressors are positive-displacement machines, and the centrifugal compressor operates by virtue of centrifugal force. The four parts of this chapter examine each of these types of compressors.