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10 TRG-TRC012-EN
notes
period one
Components
Cooling water flows first through the lower tubes of the condenser and then
through the upper tubes. This produces a nearly constant temperature
difference between the downward moving refrigerant and the tube surfaces,
resulting in a uniform heat transfer rate within the tube bundle.
Subcooled liquid refrigerant leaves the condenser (subcooler) and flows
through the liquid line to the expansion device.
In a typical air-cooled condenser, propeller-type fans are used to draw
outdoor air over a fin-tube heat transfer surface. The hot, high-pressure
refrigerant vapor flows through the tubes as heat is transferred to the cooler
outdoor air. The resulting reduction in the heat content of the refrigerant vapor
causes it to condense into liquid. Within the final few lengths of condenser
tubing the condensed liquid refrigerant is subcooled.
Again, subcooled liquid refrigerant leaves the condenser (subcooler) and flows
through the liquid line to the expansion device.
The differences between water-cooled and air-cooled chiller applications will be
discussed further in Period 5.
air-cooled
Condenser
subcooler
subcooler
outdoor air
outdoor air
condenser
condenser
coil
coil
propeller fan
propeller fan
Figure 18