Introduction

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The purpose of the compressor in a refrigeration system is to raise the pressure of the refrigerant vapor from evaporator pressure to condensing pressure. It delivers the refrigerant vapor to the condenser at a pressure and temperature at which the condensing process can be readily accomplished, at the temperature of the air or other fluid used for condensing.

A review of the refrigeration cycle, using the pressure–enthalpy chart, will help to illustrate this point.

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