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13 3. Structure Of Screw Chiller; Chiller Cycle - LG RCWW Operation & Maintenance Manual

Water-cooled screw chiller
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3. STRUCTURE OF SCREW CHILLER

3-1. Chiller cycle

As shown in the chiller cycle figure below, the compressor discharges the high temperature/pressure refrigerant to
the condenser through the exhaust outlet in gas state. The refrigerant in the gas state in the condenser flows out-
side of the tube, while the cooling water flows inside of the tube. The refrigerant in high temperature and pressure
is condensed as the heat is taken away by the cooling water inside the heat pipe of the condenser. The condensed
refrigerant is gathered in the bottom of the condenser and goes through the dryer filter, orifice or expansion valve
by differential pressure, and into the evaporator. The chilled water is finally obtained in the chiller's evaporator. Dur-
ing the gasification stage, the refrigerant in liquid state absorbs a large amount of heat from the cooling water and is
converted into gas state. And during the cooling water is getting colder, the refrigerant in gas state is absorbed into
the compressor. There, the gas state refrigerant is compressed by the compressor into high temp/high pressure re-
frigerant and sent again to the condenser. And the same cycle begins again.
Figure 4 Chiller cycle(1 cycle)
3. STRUCTURE OF SCREW CHILLER
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