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TRG-TRC010-EN 57
Glossary
notes
pressure-enthalpy chart A graphical representation of the saturated
properties of a refrigerant, plotting refrigerant pressure versus enthalpy.
purge A device used to remove air, moisture, and other noncondensable
gases that may leak into a low-pressure chiller.
refrigerant migration A method of free cooling that allows the chiller to be
used as a heat exchanger, without operation of the compressor. It is possible,
when the condensing temperature of the refrigerant is low enough, for
refrigerant to migrate from the evaporator to the condenser.
refrigeration effect The amount of heat that each pound [kg] of liquid
refrigerant will absorb when it evaporates.
starter A device used to connect and disconnect the chiller motor and the
electrical distribution system.
surge A condition of unstable compressor operation where the refrigerant
alternately flows backward and forward through the compressor impeller,
generating noise and vibration.
variable-speed drive See adjustable-frequency drive.
volute A large space around the perimeter of a centrifugal compressor that
collects refrigerant vapor after compression.
water-cooled condenser A type of condenser that rejects the heat of the
refrigerant to water flowing through it.
trgtrc010_book.book Page 57 Wednesday, September 1, 1999 10:42 AM