22 TRG-TRC003-EN
notes
period three
Refrigeration Cycle

Basic Refrigeration System

This diagram illustrates a basic vapor-compression refrigeration system that
contains the described components. First, notice that this is a closed system.
The individual components are connected by refrigerant piping. The suction
line connects the evaporator to the compressor, the discharge line connects
the compressor to the condenser, and the liquid line connects the condenser
to the evaporator. The expansion device is located in the liquid line.
Recall that the temperature at which refrigerant evaporates and condenses is
related to its pressure. Therefore, regulating the pressures throughout this
closed system can control the temperatures at which the refrigerant evaporates
and then condenses. These pressures are obtained by selecting system
components that will produce the desired balance. For example, select a
compressor with a pumping rate that matches the rate at which refrigerant
vapor is boiled off in the evaporator. Similarly, select a condenser that will
condense this volume of refrigerant vapor at the desired temperature and
pressure.
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Figure 34