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Critical temperature T c, the temperature below which the wire becomes a superconductor; Critical current density J c, the maximum current a superconducting wire can carry per unit cross-sectional area (see images below for examples with 20 kA/cm 2). Superconducting wires/tapes/cables usually consist of two key features:
The nichrome wire is wound around a ceramic core, and the number of spirals per inch vary according to the requested watt density. Potential from an alternating current source, which can either be 2 phase or 3 phase, flows through the coiled nichrome wire, heating up the wire, which in turn, heats the cartridge heater sheath.
Kanthal is the trademark for a family of iron-chromium-aluminium (FeCrAl) alloys used in a wide range of resistance and high-temperature applications. Kanthal FeCrAl alloys consist of mainly iron, chromium (20–30%) and aluminium (4–7.5 %).
The suburban Long Island electrical substation is fed by a 2,000 foot (600 m) underground cable system which consists of about 99 miles (159 km) of high-temperature superconductor wire manufactured by American Superconductor chilled to −371 °F (−223.9 °C; 49.3 K) with liquid nitrogen, [dubious – discuss] greatly reducing the cost ...
Nichrome, a non-magnetic 80/20 alloy of nickel and chromium, is the most common resistance wire for heating purposes because it has a high resistivity and resistance to oxidation at high temperatures, up to 1,400 °C (2,550 °F). When used as a heating element, resistance wire is usually wound into coils.
The strength and high-temperature stability of refractory metals make them suitable for hot metalworking applications and for vacuum furnace technology. Many special applications exploit these properties: for example, tungsten lamp filaments operate at temperatures up to 3073 K, and molybdenum furnace windings withstand 2273 K.
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The lower temperatures and large surface area of underfloor heating systems make them ideal heat emitters for air source heat pumps, evenly and effectively radiating the heat energy from the system into rooms within a home. The maximum temperature of the heating surface can vary from 29–35 °C (84–95 °F) depending on the room type.