that movement of a piston in a compressor cylinder during which the gas is compressed and discharged.

1. device for mechanically increasing the pressure of a gas.

design maximum rate of heat removal by the refrigerant assigned to the compres­sor in a refrigerating system. This is equal to the product of the mass rate of refrigerant flow produ­ced by the compressor and the difference in specif­ic enthal­pies of the refrigerant vapor at its thermodynamic state entering the compressor and the refriger­ant liquid at saturation temperature cor­responding to the pressure of the vapor leaving the com­pressor.

device, such as a clearance pocket, movable cylinder head, or suction bypass, by which compressor capacity can be ad­justed without otherwise changing the operating conditions.

space of controlled volume to give the effect of greater or less cylin­der clearance, thereby changing compressor capaci­ty.

that part of the compressor at the high-pressure side 

that part of the piston stroke between the opening of the discharge valve and the top dead center 

actual volume of gas or vapor at compres­sor inlet conditions moved by a compressor, per revolution or per unit of time. Compare piston displace­ment 

process whereby a side port in the com­pressor (usually a screw compressor or multiwheel centrifu­gal compressor) is used to provide refrigerant sub-cooling, resulting in an improvement in overall system efficiency