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 blower evaporator. The low- temperature evaporator has two axial-flow fans and an electric defrost.

COMPRESSORS

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 evaporator.

Figure 14-18. - Low-temperature blower evaporator.

Figure 14-19. - Hermetic compressor.