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16 TRG-TRC012-EN
notes
A pressure-enthalpy (p-h) chart illustrates the refrigeration cycle of the helical-
rotary water chiller.
But first, lets review the components of the helical-rotary chiller’s refrigeration
cycle...
Refrigerant vapor leaves the evaporator and flows to the compressor where it is
compressed to a higher pressure and temperature. Oil is removed from
refrigerant vapor in the oil separator and the refrigerant travels to the
condenser while the oil is recirculated back to the compressor.
In the condenser, the refrigerant vapor rejects heat to water or air and leaves as
a sub-cooled liquid. The pressure drop created by the expansion device causes
a portion of the liquid refrigerant to evaporate and the resulting mixture of
liquid and vapor refrigerant enters the liquid/vapor separator. Here the vapor is
Helical-Rotary Water Chillers
period two
Figure 25
helical-rotary water chiller
Refrigeration Cycle
oil separator
oil separator
condenser
condenser
evaporator
evaporator
expansion
expansion
device
device
liquid/vapor
liquid/vapor
separator
separator
compressor
compressor
Figure 26
period two
Refrigeration Cycle