The refrigerant evaporated in the evaporator is compressed to the condensation pressure in the compressor. During this process, the temperature of the vapor refrigerant rises due to its pressure. During this process, the pressure and temperature of the vaporous refrigerant rise. The compression process is done by reducing the initial volume in a closed environment. In reciprocating compressors, the movement of the piston in the cylinder; in screw and scroll compressors, it is provided in the form of narrowing the cross-sectional area. Compressors are classified as open, semi-hermetic and hermetic, depending on the engine drive. In open compressors, the drive of the electric motor is transferred to the compressor shaft by belt-pulley. It is not used much. In hermetic compressors, the motor and the compressor shaft are directly connected to each other in a sealed environment. In semi-hermetic compressors, the compressor shaft, which is in separate environments, takes direct action by providing impermeability from the motor shaft.
Things to Consider in Compressor Selection