Heating element
A heating element is a technical component with which heat energy can be supplied to a substance (such as a gas or a liquid ) .
Electric heating elements
Electric heating elements are the most common form, they convert electricity into heat. Usually they contain a heating coil through which current flows , which is electrically insulated from the material to be heated.
In industrial furnaces such as B. Continuous ovens, such electrical heating elements are used as an alternative to heating with natural gas. Temperatures of over 1200 ° C can be reached.
A special design are "self-regulating heating elements" made from PTC thermistors . As the temperature rises, the resistance increases and the heating output P = U² / R decreases. This stabilizes the temperature.
Electrical heating elements can be found in many household appliances today - in water heaters , washing machines , toasters , hair dryers , irons , coffee machines , but also in industrial applications such as heating hoses , heating mantles or heating jackets . This form of heat supply (in Germany) contributes the largest part of the electricity demand .
Other heating elements
In contrast to electrically operated heating elements, there are also those that are operated with other heat carriers, e.g. B. hot oil, hot water, steam. The heating of this heat carrier takes place in a separate device, for. B. a boiler. The transport to the heating element is carried out by pipes or hoses.
When heating large rooms (halls, tents) z. B. radiant ceiling panels are used.
References
- ↑ Crystec Technology Trading GmbH: Continuous ovens with electrical heating elements. Accessed in 2009 .
- ↑ Crystec Technology Trading GmbH: Electric heating elements for industrial ovens. Accessed in 2009 .
