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A furnace in which the air is heated by passing directly over the electric heating elements. Electric energy is converted to heat using open wire resistance heating elements.
The main advantage offered by the electric furnace is the neutral nature of the heat source. The most common type of electric furnace is the direct-arc type where the heat comes from arcing between the long graphite electrodes and molten charge. It is the efficient method and modern steel plants use this method.

Related Terms

SEEBECK EFFECT

When two different adjacent metals are heated, an electric current is generated between the metals.

SKIN CONDENSER

Condenser using the outer surface of the cabinet as the heat radiating medium.

AIR COOLER

A factory-encased assembly of elements whereby the temperature of air passing through the device is reduced.

DIELECTRIC STRENGTH

A measure of the ability of an insulating material to withstand electric stress (voltage) without failure. Fluids with high dielectric strength (usually expressed in volts or kilovolts) are good electrical insulators. (ASTM Designation D 877.)

AIR INFILTRATION

The leakage of air into a room through cracks in doors, windows, and other openings.

AMMETER

An instrument for measuring the magnitude of electric current flow.

ARC

A flash, caused by an electric current ionizing a gas or vapor.

CLEAN ROOM

A facility or enclosure in which air content and other conditions (such as temperature, humidity, and pressure) are controlled and maintained at a specific level by special facilities and operating processes and by trained personnel.

OUTDOOR AIR

Air taken from outdoors and, therefore, not previously circulated through the system.

SPREAD

The divergence of the air stream in a horizontal or vertical plane after it leaves the outlet.
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