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114 TRG-TRC016-EN
Glossary
expansion tank A component of a closed piping system that accommodates
the expansion and contraction of the water as temperature and, therefore,
density, changes.
fouling Minerals in the water that form scaling on the internal surfaces of the
heat exchanger tubes.
generator A component of the absorption refrigeration cycle in which
refrigerant vapor boils and is separated from the absorbent solution as it
absorbs heat from the primary heat source.
heat recovery The process of capturing the heat that is normally rejected from
the chiller condenser and using it for space heating, domestic water heating,
or another process seems unnecessary.
helical-rotary (screw) compressor A type of compressor that uses two mated
rotors to trap the refrigerant vapor and compress it by gradually shrinking the
volume of the refrigerant.
hybrid system A chilled-water system that can use more than one type of fuel.
indirect-fired A type of absorption chiller that uses steam or a hot fluid
(such as water) from an external source to provide heat to the generator.
Integrated Part-Load Value (IPLV) An equation that predicts chiller efficiency
at the ARI standard rating conditions, using weighted-average load curves
that represent a broad range of geographic locations, building types, and
operating-hour scenarios, both with and without an air side economizer.
Nonstandard Part-Load Value (NPLV) An equation that predicts chiller
efficiency at nonstandard rating conditions, using weighted-average load
curves that represent a broad range of geographic locations, building types,
and operating-hour scenarios, both with and without an air side economizer.
primary-secondary (decoupled) system A configuration of a multiple-chiller
system that uses separate production and distribution pumps to hydraulically
decouple the production capacity of the chillers from the load of the distribution
system.
reciprocating compressor A type of compressor that uses a piston that travels
up and down inside a cylinder to compress the refrigerant vapor.
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.
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.
single-effect A type of absorption chiller that uses a single generator.