electric heating

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electric heating

[i¦lek·trik ′hēd·iŋ]
(engineering)
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 periodicals archive ?
Limited Tenders are invited for Supply Of Super Structure For Security Guard Post, Construction Material, Erection Tools, Electric Stores, Sleeping Bunks, Electrical Heating Device And Fire Extinguisher.
The so-called hot plate, which is a small electrical heating element, may have been left on to keep food warm, New York fire commissioner Daniel Nigro told a news conference.
WHEN Ed Miliband was Labour's Energy Minister, he must have agreed to his department's decision (to help promote [exaggerate the advantages of ] wind power), that the figures for the number of homes that could be supplied from a wind farm would assume that each home would be limited to 1200 watts (just one 5 amp socket); which means they could never use any form of electrical heating, not for warmth, cooking or even boiling a kettle
We'd like to remind people to get blankets and other electrical heating devices checked every three years and buy a new one if they are not working properly.
Many high-rise buildings have been built on electrical heating - including under-floor heating or electric heater batteries.
Siemens Energy has received an order to deliver customized direct electrical heating (DEH) power supply systems for 10 subsea flow lines, with an option for two additional systems.
AN electrical heating manufacturer is to create 50 new jobs with the establishment of a new production facility in North Wales.
Fitzpatrick minimized these problems by using electrical heating to melt the resin and the rotating screw only for melt transportation.
The artificial muscles contract and relax in response to changes in temperature, which can be controlled by an electrical heating element.
Release date- 23052013 - Wartsila is the market leader in topside direct electrical heating systems being involved in 85 per cent of all contracted systems to date.
The System Suitable for Research and Development of Electrical Heating Materials, and Capable to Cut Down the Measurement Time Drastically
The main consumers of current are the electrical pump that drives the hydraulic system, electrical heating and the temperature control of circulating fluid media.

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