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56 TRG-TRC010-EN
Glossary
economizer The component of a multistage centrifugal chiller used to remove
vapor from the refrigerant mixture after it passes through an expansion device.
This reduces the compressor power required since the refrigerant vapor
generated in the economizer only needs to be compressed by the higher-stage
impeller(s).
enthalpy The property of a refrigerant indicating its heat content, both
sensible and latent.
evaporator The region of the chiller where the system chilled water is
continuously cooled by boiling the refrigerant as it picks up heat from the
returning system water.
expansion device The component of the chiller used to reduce the pressure
and temperature of the refrigerant.
flash The process of liquid refrigerant being vaporized by a sudden reduction
of pressure.
flooded shell-and-tube evaporator A type of evaporator where water flows
through the tubes and refrigerant fills the surrounding shell.
gear-drive motor A type of motor that transfers its energy to the impeller shaft
using a set of gears, allowing the impeller to rotate at a higher speed than the
motor.
hermetic motor A type of motor that is totally enclosed within the chiller’s
refrigeration system and rejects its heat to the liquid refrigerant.
impeller The rotating component of a centrifugal compressor that draws
refrigerant vapor into its internal passages and accelerates the refrigerant as it
rotates, increasing its velocity and kinetic energy.
inlet vanes A device used to vary the capacity of a centrifugal compressor by
“pre-swirling” the refrigerant in the direction of rotation before it enters the
impeller, lessening its ability to take in the refrigerant vapor.
loop time The amount of time it takes a particle of water to travel through the
chilled water loop.
multistage centrifugal compressor A centrifugal compressor that uses more
than 1 impeller to share the task of compressing the refrigerant.
open motor A type of motor that is mounted externally—outside of the
chiller’s refrigeration system—and uses a coupling to connect the motor and
compressor shafts. It rejects its heat to air drawn in from the equipment room.
orifice plate A type of expansion device that uses a fixed plate with holes
drilled in it to reduce the pressure and temperature of the refrigerant to the
conditions of the evaporator.
trgtrc010_book.book Page 56 Wednesday, September 1, 1999 10:42 AM