Apr 01, 2016
1, electric wire
Electric wire was the first emergence of a heating element, it is realized to the principle of electric energy. Electric wire for traditional electric heating element, but has yet to be replaced, heating wires now remain in various fields, especially industrial production and laboratory have been widely used.
Heating wire in recent years the use of Fe-CR alloy and NI-CR alloy, Fe-CR alloy 1400 c was the maximum temperature has been reached. Heating wire based on the recently developed electric rods, electric hot plates, electric heating elements, but their nature remains the electric wire, the principle also from electric.
The advantage of heating wire is heated and heat-resistant temperature is raised, mature technology, ease of manufacture, and convenient supporting facilities should be used for all heating equipment. Disadvantages of electric wire is its low energy conversion rate, accompanied by glowing process during heating, so only 60% to 70% conversion rate.
2, PTC heating elements
PTC Positive Temperature Coefficient is the name, which is the thermistor, it is a composite of conductive material sintered by a heating element. PTC electric heating element heating element is the second after the emergence of a heating element, is limited by the Curie temperature limit, can only be used below 350 ¡æ heating, used in a variety of low-power low-temperature heating equipment.
Advantages of PTC heating elements are no fire when it is heated, heat efficiency of up to 70%. Disadvantage is the poor seismic performance of PTC heating elements, cannot be cut, especially limited PTC heating element by the Curie temperature, the heating cannot be used for more than 350 ℃, PTC heating element application in real life only confined to the low temperature heating.