electric heating

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electric heating

[i¦lek·trik ′hēd·iŋ]
Any method of converting electric energy to heat energy by resisting the free flow of electric current.

Electric heating

Methods of converting electric energy to heat energy by resisting the free flow of electric current. Electric heating has several advantages: it can be precisely controlled to allow a uniformity of temperature within very narrow limits; it is cleaner than other methods of heating because it does not involve any combustion; it is considered safe because it is protected from overloading by automatic breakers; it is quick to use and to adjust; and it is relatively quiet. For these reasons, electric heat is widely chosen for industrial, commercial, and residential use.

Resistance heaters produce heat by passing an electric current through a resistance—a coil, wire, or other obstacle which impedes current and causes it to give off heat. Heaters of this kind have an inherent efficiency of 100% in converting electric energy into heat. Devices such as electric ranges, ovens, hot-water heaters, sterilizers, stills, baths, furnaces, and space heaters are part of the long list of resistance heating equipment. See Resistance heating

Dielectric heaters use currents of high frequency which generate heat by dielectric hysteresis (loss) within the body of a nominally nonconducting material. These heaters are used to warm to a moderate temperature certain materials that have low thermal conducting properties; for example, to soften plastics, to dry textiles, and to work with other materials like rubber and wood. See Dielectric heating

Induction heaters produce heat by means of a periodically varying electromagnetic field within the body of a nominally conducting material. This method of heating is sometimes called eddy-current heating and is used to achieve temperatures below the melting point of metal. For instance, induction heating is used to temper steel, to heat metals for forging, to heat the metal elements inside glass bulbs, and to make glass-to-metal joints. See Induction heating

Electric-arc heating is really a form of resistance heating in which a bridge of vapor and gas carries an electric current between electrodes. The arc has the property of resistance. Electric-arc heating is used mainly to melt hard metals, alloys, and some ceramic metals. See Arc heating

Electricity is one choice for heating houses, but with only a 35% efficiency rate, electricity has been a less attractive option than the direct use of gas and oil for heating homes. Common electric heating systems in houses are central heating employing an electric furnace with forced air circulation; central heating employing an electric furnace with forced water circulation; central heating using radiant cables; electrical duct heaters; space (strip) heaters which use radiation and natural convection for heat transfer; and portable space heaters.

References in classic literature ?
An ingenious system of electric heating, which has since been imitated, allowed the temperature of the walls and room to be increased at will.
Contract notice: Operation and maintenance of collective boiler rooms natural gas, Wood / fuel, Wood / gas and basic electric heating
The Ingersoll Rand Group company said the new B-100 30 non-diesel, vehicle-powered refrigeration unit also has an electric heating option within the same compact dimensions as others in its B-series refrigeration systems.
They have an impressive 10-year guarantee and can be used as either central heating or electric radiators - fit an electric heating element and you can have toasty towels without having to turn the heating on.
Many homes with no central heating are often off the gas grid and use expensive electric heating.
The company's product portfolio comprises thousands of products, covering approximately 30 product categories that address virtually every electric heating application across nearly every industrial process and commercial end market.
A summary of the electric heating settings for the variable capacity equipment and the baseline equipment at each field site is provided in Table 2.
International Resource News-June 10, 2014--Chromalox introduces DirectConnect medium voltage electric heating systems
In a concrete slab or under a tile floor, electric heating cable is usually laid in a serpentine pattern in the concrete or thinset.
The two-bedroom home, which is available on an unfurnished basis, has electric heating, double glazing, a phone entry system and energy rating D.
By then, the study reckons 11% of households will only use electric heating, pay 19% of the cost of the Government's green energy policies but get just 7% of the benefit.
By then, the study reckons 11 per cent of households will only use electric heating.