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TRG-TRC011-EN 69
absorbent A substance used to absorb refrigerant and transport it from the
low-pressure to the high-pressure side of the absorption refrigeration cycle. In
absorption water chillers, the absorbent is commonly lithium bromide.
absorber A component of the absorption refrigeration system where
refrigerant vapor is absorbed by the absorbent solution and rejects heat to
cooling water.
adjustable-frequency drive (AFD) A device used to control the capacity of a
pump by varying the speed of the pump motor.
ARI Air Conditioning & Refrigeration Institute.
ARI Standard 560 A publication, titled “Absorption Water Chilling and Water
Heating Packages,” used to promote consistent rating methods for many types
and sizes of absorption water chillers, using water as the refrigerant and lithium
bromide as the absorbent. It covers single-effect chillers operating on steam or
a hot fluid; indirect-fired double-effect chillers operating on steam or a hot fluid;
and direct-fired double-effect chillers operating on natural gas, oil, or liquid
petroleum (LP).
ASHRAE American Society of Heating, Refrigerating and Air-Conditioning
Engineers.
ASHRAE Standard 15 A publication, titled “Safety Code for Mechanical
Refrigeration,” that specifies safe design, construction, installation, and
operation of refrigerating systems.
auxiliary heating bundle A separate heat exchanger added to a direct-fired
absorption chiller to allow it to provide simultaneous cooling and heating.
chilled water The cold water produced by the chiller (flowing through the
tubes in the evaporator) and pumped to the air-handler coils throughout the
building.
chilled-water system Uses water as the cooling media. The refrigerant inside
the evaporator absorbs heat from the water and this water is pumped to coils in
order to absorb heat from the air used for space conditioning.
coefficient of performance (COP) A dimensionless ratio used to express the
efficiency of a refrigeration machine. For an absorption water chiller, it is
defined as the ratio of evaporator cooling capacity divided by the heat energy
required by the generator, excluding the electrical energy needed to operate the
pumps, purge, and controls. A higher COP designates a higher efficiency.
compressor A mechanical device used in the vapor-compression refrigeration
cycle to increase the pressure and temperature of the refrigerant vapor.
concentrated absorbent solution A mixture of refrigerant and absorbent that
has a relatively low refrigerant content and high absorbent content.
Glossary