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 periodicals archive ?
Heating of a beam in the temperature range 20[degrees]C-60[degrees]C was done with the use of a resistance heater (Fig.
The variable speed fan will provide the required air pressure to overcome the resistance of the test stand ducts, resistance heater, blenders and instrumentation equipment.
The cable induces eddy currents in the steel of the barrel, which turns the barrel itself into a resistance heater.
Each HOBO U30 monitoring system will measure and record whole house power, the amount of energy used for hot water heating, indoor and outdoor air temperatures, and the power consumption of both the electric resistance heater and ductless heat pump in each house.
Instead of using copper heating elements, Dr Kolaric uses a transparent coat of carbon lacquer, made from carbon nano tubes to create a nano version of a resistance heater.
So far, the team has proved that it can make bubbles, a fraction of a millimeter in size, in water by sending current through a resistance heater made from a filament of gold affixed to silicon by standard computer-chip-making techniques.
4[degrees]F) of the desired temperature using a resistance heater or chiller with a heat exchanger.
The fixture for the lower (moving) specimultiple includes an electrical resistance heater and two J-type thennocouples for temperature measurement and control above ambistill conditions.
Limited Tenders are invited for Supply of Gh Induction Heater Coil For Al Bil, Lower Guide Rail, Resistance Heater Coil For 160 Dia, Resistance Heater Coil Set, Set Of Gh Induction Make Spares, Steel Billet Heater Coil For 64/75, Tunnel For R
Xaloy's Indx system turns the steel barrel itself into a resistance heater by generating electrical eddy currents in the metal near the outer surface of the barrel tube.
Some of this heating use is from the backup electric resistance heater for the building.
The air heater consists of exposed electric resistance heater elements which assist in the cleanup of the recirculating air by incineration of some of the airborne contaminants.