In a refrigeration system, the evaporator, condenser, compressor, and expansion valve are the four essential components. The evaporator is responsible for delivering cooling capacity; the refrigerant absorbs heat from the object being cooled, thus achieving refrigeration. The compressor, the heart of the system, draws in, compresses, and transports refrigerant vapor. The condenser releases heat, transferring the heat absorbed in the evaporator, along with the heat generated by the compressor's work, to the cooling medium. The expansion valve throttles and reduces the pressure of the refrigerant, controlling and regulating the amount of liquid refrigerant flowing into the evaporator, and dividing the system into a high-pressure side and a low-pressure side.
In actual refrigeration systems, in addition to these four main components, auxiliary equipment is often included, such as solenoid valves, distributors, dryers, solar collectors, fusible plugs, and pressure controllers. These components are installed to improve operational economy, reliability, and safety.
