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12 TRG-TRC012-EN
notes
period one
Components
The orifice plate is another type of expansion device found in helical-rotary
chillers. The column of liquid refrigerant creates a head pressure at its base,
allowing it to pass through the orifices and undergo a pressure drop equal to
the head (H) before it flashes. As the load decreases, less refrigerant is moved
throughout the chiller, causing the level of the liquid column to drop. This
causes additional flashing at the orifice plate which, in turn, results in feeding
less liquid to the evaporator.
Liquid/Vapor Separator
The mixture of liquid and vapor refrigerant that leaves the expansion device
enters a liquid/vapor separator. Here the liquid refrigerant settles to the
bottom of the chamber and the vapor is drawn off the top and routed directly to
the suction side of the compressor. The remaining liquid refrigerant is then
routed to the evaporator.
expansion device…
Orifice Plates
to
to
evaporator
evaporator
orifice plates
orifice plates
H
H
Figure 20
Liquid/Vapor Separator
from
from
expansion
expansion
device
device
liquid refrigerant
liquid refrigerant
to evaporator
to evaporator
refrigerant vapor
refrigerant vapor
to compressor
to compressor
Figure 21