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TRG-TRC012-EN 47
air-cooled condenser A type of condenser that rejects the heat of the
refrigerant to air flowing through it.
ARI Air Conditioning & Refrigeration Institute
ARI Standard 550/590 A publication, titled “Standard for Water Chilling
Packages Using the Vapor-Compression Cycle”, used to promote consistent
rating and testing methods for all types and sizes of water chillers. It covers
factory-designed, prefabricated water chillers, both air-cooled and water-
cooled, using the vapor-compression refrigeration cycle.
ASHRAE American Society of Heating, Refrigerating and Air Conditioning
Engineers
ASHRAE Guideline 3 A publication, titled “Reducing Emission of Halogenated
Refrigerants in Refrigeration and Air Conditioning Equipment and Systems”,
that includes a recommended list of data points to be logged daily for each
water chiller.
compressor The mechanical device used by the chiller to increase the
pressure and temperature of the refrigerant vapor.
condenser The region of the chiller where refrigerant vapor is converted to
liquid as it rejects heat to water or air.
control panel The microprocessor-based panel that monitor the chiller’s
operation, protects it from damage, provides the operator with data and
diagnostic messages, and permits interfacing with a building automation
system.
direct expansion (DX) shell-and-tube evaporator A type of evaporator where
refrigerant flows through the tubes and water fills the surrounding shell.
electronic expansion valve A type of expansion device that uses an
electronically-actuated valve to sense and control the flow rate of liquid
refrigerant to the evaporator.
enthalpy The property of a refrigerant indicating its total heat content, both
sensible and latent.
evaporator The region of the chiller where the system chilled water is
continuously cooled by flashing the refrigerant to vapor as it picks up heat from
the returning chilled water.
expansion device The component of the chiller used to reduce the pressure
and temperature of the refrigerant.
flooded shell-and-tube evaporator A type of evaporator where water flows
through the tubes and refrigerant fills the surrounding shell.
liquid/vapor separator The component of the chiller used to remove vapor
from the refrigerant mixture after it passes through the expansion device. This
Glossary