390 Chapter 13 Energy and Power
The evaporator in a refrigerator is a coil that is made from series of tubes that are located
inside the freezer section of the refrigerator (see Figure 13.12). In an air-conditioning unit,
the evaporator coil is located in the ductwork, near the fan – furnace unit inside the house. After
leaving the evaporator, the refrigerant enters the compressor, where the temperature and
the pressure of the refrigerant is raised. The discharge side of the compressor is connected to
the inlet side of the condenser, where the refrigerant enters the condenser in gaseous phase at
a high temperature and pressure. Because the refrigerant in the condenser has a higher tem-
perature than the surrounding air, heat transfer to the surrounding air occurs, and consequently
Condenser
Evaporator
inside the
ductwork
Compressor
Expansion valve
or capillary tube
Evaporator
Condenser
Compressor
1
■Figure 13.11
A schematic diagram of
a vapor–compression cycle.
Source:Courtesy of Rheem Corporation
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