Manual for Refrigeration Servicing Technicians - UNEP - Division of ...

Glossary
Phase-out
The ending of all production and consumption of a chemical controlled under
the Montreal Protocol.
Piping
All pipes or tubes (including hoses, bellows, fittings, or flexible pipes) for
interconnecting the various parts of a refrigerating system.
Power
It’s the time rate of which work is done or energy is transferred.
Pressure relief device
A pressure relief valve or bursting disc device designed to relieve excessive
pressure automatically.
Pressure relief valve
A pressure actuated valve held shut by a spring or other means and designed
to relieve excessive pressure automatically by starting to open at a set
pressure and re-closing after the pressure has fallen below the set pressure.
Push-pull method
A method for recovering and recycling refrigerant from a system using a
negative pressure (suction) on one side to pull the old refrigerant out and
pumping recycled refrigerant vapour to the other side to push the old
refrigerant through the system.
Reclaim
Processing used refrigerants to new product specifications. Chemical analysis
of the refrigerant determines that appropriate specifications are met. The
identification of contaminants and required chemical analysis both are specified
in national and international standards for new product specifications.
Reclamation
Reprocessing and upgrading of a recovered controlled substance through
mechanisms such as filtering, drying, distillation and chemical treatment
in order to restore the substance to a specified standard of performance.
Chemical analysis is required to determine that appropriate product
specifications are met. It often involves processing off-site at a central facility.
Recovery
The collection and storage in an external container, of controlled substances
from machinery, equipment, containment vessels, etc., during servicing or
prior to disposal without necessarily testing or processing it in any way.
Recycling
Reducing contaminants in used refrigerants by separating oil, removing noncondensables
and using devices such as filters, driers or filter-driers to reduce
moisture, acidity and particulate matter. The aim of recycling is to reuse the
recovered refrigerant and normally involves recharge back into equipment and
it often occurs on-site.
Refrigerant
A fluid used for heat transfer in a refrigerating system, which absorbs heat at a
low temperature and a low pressure and rejects heat at a higher temperature
and a higher pressure usually involving changes of the state of the fluid.
Refrigerant detector
A sensing device which responds to a pre-set concentration of refrigerant gas
in the environment.
Refrigerating system
A combination of interconnected refrigerant-containing parts constituting one
closed refrigerant circuit in which the refrigerant is circulated for the purpose
of extracting and rejecting heat (i.e. cooling, heating).
Refrigeration
It is the process of lowering the temperature of substance or a space to a
desired temperature based on type of application.
Retrofit
The upgrading or adjustment of equipment so that it can be used under
altered conditions; for example, of refrigeration equipment to be able to use
an alternative refrigerant in place of a CFC, HCFC or HFC.
Saturated vapour pressure
The maximum vapour pressure of a substance at a given temperature when
accumulated over its liquid state in a confined space.
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