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TRG-TRC004-EN 47
Glossary
reciprocating compressor A type of compressor that uses a piston that travels
up and down inside a cylinder to compress the refrigerant vapor.
refrigerant A substance used to absorb and transport heat for the purpose of
cooling.
rotor The part of the helical-rotary compressor used to trap and compress the
refrigerant vapor. The male and female rotors mesh together, forming pockets
of refrigerant to move through the compressor.
scroll compressor A type of compressor that uses two opposing scrolls to trap
the refrigerant vapor and compress it by gradually shrinking the volume of the
refrigerant.
semihermetic compressor A type of compressor that has the motor sealed
within the compressor housing. The sealed housing may be opened to repair or
overhaul the compressor or motor.
slide valve The part of the helical-rotary compressor used to vary the flow rate
of refrigerant vapor through it.
suction line A pipe that transports refrigerant vapor from the evaporator to
the compressor in a mechanical refrigeration system.
variable-air-volume (VAV) system A type of air-conditioning system that
varies the volume of constant temperature air supplied to meet the changing
load conditions of the space.
variable-speed drive See adjustable-frequency drive.
volute A large space around the perimeter of a centrifugal compressor that
collects refrigerant vapor after compression.