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A set of movable vanes in the inlet of a fan to provide regulation of airflow.

Related Terms

HORIZON SYSTEM OF COORDINATES

A set of celestial coordinates based on the celestial horizon as the primary great circle; usually altitude and azimuth or azimuth angle.

AUXILIARY CONTACTS

A set of contacts that perform a secondary function, usually in relation to the operation of a set of primary contacts.

FORESAIL

The lowest sail set on the foremast of square-rigged ship

BLAST FREEZER

Low-temperature evaporator which uses a fan to force air rapidly over the evaporator surface.

NET FAN REQUIREMENTS

The calculated operating conditions for a fan excluding tolerances.

DISPLACEMENT PUMP

Pumps in which energy is added to the water periodically and the water is contained in a set volume.

DEMAND CONTROL

A device which controls the kW demand level by shedding loads when the kW demand exceeds a predetermined set point.

SUCTION SIDE

Low-pressure side of the system extending from the refrigerant control through the evaporator to the inlet valve of the compressor.

DRIFT

Term used to describe the difference between the set point and the actual operating or control point.

EVAPORATOR FAN

Fan which increases airflow over the heat exchange surface of evaporators.
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