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TRG-TRC005-EN 21
period three
Evaporators
notes
Typically, an expansion valve is used to control the flow rate of refrigerant
through the evaporator to maintain the proper amount of superheat, ensuring
that the liquid refrigerant will be completely vaporized. Working in conjunction
with the unloading or cycling compressors, the expansion valve allows the
evaporator capacity to match the system load. The operation of the expansion
valve will be discussed further in Period Four.
When an evaporator contains more than one liquid-refrigerant distributor, it is
split into independently-controlled sections, each being served by its own
expansion valve. By turning on and shutting off these coil sections, the
evaporator can further control its capacity to better match the system load.
The three common arrangements for splitting finned-tube evaporator coils
include: face-split, intertwined, and row-split.
Finned-Tube Evaporator Control
expansion
expansion
valve
valve
refrigerant
refrigerant
vapor
vapor
evaporator
evaporator
liquid
liquid
refrigerant
refrigerant
Figure 31
Face-Split Arrangement
distributors
distributors
Figure 32