Trane TRG-TRC004-EN Air Compressor User Manual


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TRG-TRC004-EN 27
period two
Compressor Capacity Control
notes
At full load, the slide valve is closed. The compressor pumps its maximum
volume of refrigerant, discharging it through the discharge port.
As the load on the compressor decreases, 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 load.
Inlet Vanes
A common method of modulating the capacity of a centrifugal compressor is to
use a set of vanes installed at the inlet of the compressor impeller. While a
survey of other centrifugal compressor designs shows that there are other
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