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TRG-TRC005-EN 45
period six
Review
notes
Period Three presented the different types of evaporators and methods of
evaporator control. The evaporator transfers heat from air, water, or some other
fluid to the cool liquid refrigerant. The two common types of evaporators are
finned-tube and shell-and-tube.
Period Four reviewed the operation of the expansion device, specifically the
thermostatic expansion valve. The expansion device is used to maintain the
pressure difference between the high-pressure (condenser) and low-pressure
(evaporator) sides of the system established by the compressor.
In addition, the thermostatic expansion valve (TXV) controls the quantity of
liquid refrigerant entering the evaporator. It ensures that the refrigerant will be
completely vaporized within the evaporator and maintains the proper amount
of superheat in the system.
Review—Period Three
finned-tube
evaporator
shell-and-tube
evaporator
Figure 64
Review—Period Four
external equalizer
external equalizer
remote
remote
bulb
bulb
evaporator
evaporator
TXV
TXV
distributor
distributor
Figure 65