EVAPORATORS

There are almost as many different types of evaporators as there are applications. However, evaporators are divided into two general groups. The first group has evaporators that cool air that, in turn, cools the product. The second group has evaporators that cool a liquid such as brine solution that, in turn, cools the product. Normally, the proper evaporator comes with the unit (system) that you will be installing. However, there may be an occasion when you are designing a system. At this time, you will need to determine the

Figure 14-12.-Blower-type evaporator.

Figure 14-13.-(A) Forced circulation evaporator partially installed; (B) fan unit removed.

requirements and select the proper evaporator from a manufacturer's catalog or manual. In figure 14-12 a blower-type evaporator is shown in a small space. The air enters the bottom of the evaporator, is cooled, and exits at the front of the unit. In figure 14-13, view A, a forced circulation evaporator is shown partially installed; view B shows the unit with the fan removed. A compact blower evaporator for use in low headroom fixtures is shown in figure 14-14. A vertical, flat-type blower evaporator designed for mounting behind either a window or a door frame is shown in figure 14-15. In the evaporator

Figure 14-14.-Compact blower evaporator.

Figure14-15.-Vertical, flat-type blower evaporator.

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 lowvelocity 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 lowtemperature blower evaporator. The lowtemperature evaporator has two axial-flow fans and an electric defrost.

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