The components are the following: • Evaporator where the heat transferred from a process source or from a refrigerated space results in vaporization of the refrigerant (also called coolant) • Compressor where the gas refrigerant is compressed to a relatively high pressure and temperature.
In addition, mechanical efficiency must be introduced (auxiliary power such as lubricant oil pump, etc.). Notice that in hermetic-compressors (in which the electric motor is placed in the same crank as the compressor)