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6 TRG-TRC010-EN
notes
period one
Components
Again, in the passages of the rotating impeller, the refrigerant vapor
accelerates, increasing its velocity and kinetic energy. As the area increases in
the diffuser passages, the velocity, and therefore the kinetic energy, of the
refrigerant decreases. This reduction in kinetic energy is offset by an increase in
the refrigerant’s static energy or static pressure. Finally, the high pressure
refrigerant collects in the volute around the perimeter of the compressor, where
further energy conversion takes place.
The resulting pressure and temperature of the refrigerant is now high enough
that its heat can be rejected from the chiller.
Centrifugal compressors use 1 or more impellers to compress the refrigerant. A
multistage compressor uses 2 or 3 impellers to increase the pressure of the
refrigerant in steps instead of performing the task within a single impeller.
Compressed refrigerant vapor travels from the outlet of the first-stage
compressor impeller to the inlet of the second-stage compressor impeller. After
centrifugal compressor
Energy Conversion
refrigerant
refrigerant
enters
enters
diffuser
diffuser
path through compressor
path through compressor
velocity
velocity
static pressure
static pressure
refrigerant
refrigerant
enters impeller
enters impeller
refrigerant
refrigerant
enters volute
enters volute
Figure 10
Multistage Compressor
Figure 11
trgtrc010_book.book Page 6 Wednesday, September 1, 1999 10:39 AM