electric heating

(redirected from Electric resistance heating)

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 ?
Currently, cooked food production relies on traditional heating methods such as electric resistance heating, gas heating, oil recirculation heating and similar.
If, the electrical utility's peak loads occur at low outdoor air temperatures, then having thousands of customers with ground source heat pumps that require electric resistance heating under these conditions can exacerbate peak demand problems and require bringing additional electrical generating capacity online and/or the purchase of electricity from the grid at high prices.
I know electric resistance heating is expensive to operate, but I like the idea of infloor heating.
This can be supplemented by a gas heater or heat pump, or both- but electric resistance heating cannot be used.
The transportable electric ladle is a shell-contained refractory crucible comprised of modular baffle or side pocket panels in which high-intensity electric resistance heating elements are embedded (Figs.
According to the Northwest Energy Efficiency Alliance, nearly one million homes in the Northwest still rely on electric resistance heating as a primary heat source.
The kiosks use electric resistance heating supplied by the normal electric grid.
The kiosks use electric resistance heating powered by the grid, Evanoff said, but their other electricity demands are met by the fuel cell.
As seen in Table I, the pulse technology offers annualized savings of 75, 30, 59, and 856 dollars relative to the conventional gas, fuel oil, heat pump, and electric resistance heating.
Adding terminal variable air flow control results in much less electric resistance heating needs with and without using the setback schedule.
Clear or opaque quartz tubes are used in the center and electric resistance heating elements are used on the periphery, allowing for maximum efficiency and high rates of heat transfer.
Water is heated in an insulated storage tank, in most cases either by an electric resistance heating element or by burning natural gas or LPG.