REFRIGERATION SYSTEMS

A schematic flow diagram showing the basic components of the vapour compression refrigeration system is shown in Fig. 52.6. To aid in understanding, some typical temperatures for air conditioning applications are also indicated.

Refrigerant fluid circulates through the piping and equipment in the direction shown. There are four processes (changes in the condition of the fluid) that occur as it flows through the system.

Process 1–2 : At point (1), the refrigerant is in the liquid state at a relatively high pressure and high temperature. It flows to (2) through a restriction, called the flow control device or expansion device. The refrigerant loses pressure going through the restriction. The pressure at (2) is so low that ...

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