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TRG-TRC012-EN 21
notes
period three
Compressor Capacity Control
The capacity of the helical-rotary compressor presented in this clinic is
controlled by a slide valve that is an integral part of the compressor housing.
Other helical-rotary compressor designs may use a variety of methods to vary
capacity. Some of these methods are similar in function to the slide valve
presented in this period. One major difference is whether the compressor is
designed to unload in steps, like a reciprocating compressor, or if it has variable
unloading.
The position of the slide valve along the rotors controls the volume of
refrigerant vapor being delivered by the compressor, by varying the amount of
rotor length actually being used for compression.
Note that the compressor discharge has 2 components. First, a port within the
slide valve provides a radial discharge path. Second, a port within the end-
plate of the compressor housing provides an axial discharge path.
Helical-Rotary Water Chillers
period three
Figure 31
Slide Valve
axial
axial
discharge
discharge
port
port
slide valve
slide valve
radial
radial
discharge
discharge
port
port
Figure 32