Introduction: The compressor is a device that is used to increase the pressure of compressible fluid from low pressure to high pressure by using some external energy. In the refrigeration systems, the compressors used to compress the vapor refrigerant, hence raising its pressure from evaporator pressure to condenser pressure. The pressure at both suction and discharge are related, corresponding with the type of compressor. The compressors can be classified into two types based on the working principle: 1-positive displacement type 2-dynamic type In positive displacement compressors, a certain volume of compressible fluid is drawn and trapped by closing both suction and discharge valves. In dynamic compressors, the kinetic energy is delivered to the compressible fluid by gas by velocity or the centrifugal force and then convert to pressure energy. Depending on the operating conditions, site requirements, and optimal uses, there are several differences to consider when ...