unit shown in 14-16, the motor drives two
propeller-type fans and the cool air exits at both
ends of the evaporator. Figure 14-17 shows a low-
velocity blower evaporator. In this type of
evaporator, the air enters at the two fan grills and
exits on both sides. Figure 14-18 shows a low-
temperature evaporator has two axial-flow fans
and an electric defrost.
With present technology, the newer air-
conditioning and refrigeration systems use
reciprocating, rotary, screw, centrifugal, swash
plate, and scroll compressors. There are many
designs and models available for all types of
applications. A typical hermetic compressor is
shown in figure 14-19. For more in-depth
information about compressors, you can refer to
sources, such as Modern Refrigeration and Air
Conditioning by Althouse/Turnquist/Bracciano.
Figure 14-16.Dual fan evaporator
Figure 14-17.Low-velocity blower
Figure 14-18.Low-temperature blower
Figure 14-19.Hermetic compressor.