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A refrigeration device cooling or heating air.

Related Terms

ALKALINE BOIL-OUT

Employed to remove oil and grease deposits from heating surfaces.

ANNEAL

To soften by heating and allowing to cool slowly.

ASME SECTION VI

Recommended rules for the care and operation of heating boilers.

REVERSING VALVE

Device used to reverse direction of the refrigerant flow depending upon whether heating or cooling is desired.

ARC WELDING

A process where coalescence is obtained by heating with an electric arc.

DE-AERATING HEATERS

Mechanical device using steam to strip dissolve gases from the boiler feedwater and heating the feedwater.

HYDRONIC SYSTEM

A re-circulating water system used for heating and/or comfort cooling.

HVAC

Heating, Ventilating, and Air Conditioning.

FULL ARC ADMISSION

In full-arc admission, all regulating valves open but only at a percentage of their full opening. With load increase, they all open more fully. This provides more uniform heating around the high-pressure part of the turbine. Most modern controls start with full-arc and switch to partial arc to reduce throttling losses through the valves.

PARTIAL ARC ADMISSION

In multi-valve turbine inlets, partial arc ad mission allows the steam to enter per valve opening in a sequential manner, so as load is increased, more valves open to admit steam. This can cause uneven heating on the high-pressure annulus as the valves are individually opened with load increase.
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