Engineering Fundamentals: An Introduction to Engineering, 4th ed.c

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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