The working fluid used in refrigerators.

Absorbs heat at a low temperature and a low pressure of the fluid and rejects heat at a higher temperature and a higher pressure of the fluid, usually involving changes of state of the fluid.

R-117Ammoniavery efficient refrigerant.
R-170Ethanesometimes added to other refrigerants to improve oil circulation.
R-50248.8% R-22 and 51.2% R-115
R-744Carbon Dioxide


Amount of refrigerant placed in a refrigerating unit.

Charging Board

Panel or cabinet fitted with gauges, valves and refrigerant cylinders used for charging refrigerant and oil into refrigerating mechanisms.


Trade name for a family of synthetic chemical refrigerants.

Halide Refrigerants

Family of refrigerants containing halogen chemicals.

Liquid Nitrogen

Nitrogen in liquid form can be used as a low temperature refrigerant in expendable or chemical refrigerating systems.


Specially prepared oil used in refrigerator mechanism which circulates, to some extent, with refrigerant.

Oil Separator

Device used to remove oil from gaseous refrigerant.

Permanent Gases

Cryogenic refrigerants.

See also: Refrigeration, Refrigerator.

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Subjects: Heating Ventilation and Air Conditioning