Filter
Top Products
22 TRG-TRC012-EN
notes
period three
Compressor Capacity Control
At full load, the slide valve is closed. The compressor pumps its maximum
volume of refrigerant, discharging it through both the radial and axial ports.
At part load, the slide valve modulates toward the open position. The opening
created by the valve movement allows refrigerant vapor to bypass from the
rotor pockets back to the suction side of the compressor. This reduces the
volume of vapor available for the compression process. It also reduces the
amount of rotor length available for compression. In this manner, the volume of
refrigerant that is pumped by the compressor is varied, unloading it to balance
the existing chiller load.
slide valve position...
Full Load
radial portradial port
radial port
axial portaxial port
axial port
slide valve
(closed)
compressor
compressor
discharge
discharge
Figure 33
slide valve position...
Part Load
valve
valve
opening
opening
to suction
to suction
radial port
radial port
axial port
axial port
slide valve
compressor
compressor
discharge
discharge
open
Figure 34