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18 TRG-TRC005-EN
notes
period three
Evaporators
Each distributor has an allowable range of refrigerant flow rates that define its
stable operating range. As the size of the evaporator coil increases, it may be
necessary to use more than one distributor to feed liquid refrigerant to the coil.
Inside the final length of tubes—the location where the temperature difference
between the refrigerant and the air is highest—this larger temperature
difference accelerates the rate of heat transfer and the refrigerant vapor
absorbs even more heat. When the liquid refrigerant has completely
evaporated, this additional heat gain to the vapor is called superheating.
Superheating the refrigerant vapor (the line from B to C) shifts it away from the
liquid/vapor region and ensures that the refrigerant vapor is completely free of
liquid prior to traveling to the compressor.
Superheat
superheat
superheat
{{
A
C
B
A
C
B
B
Figure 27