Industry News
What are the classifications of electric heating elements?
- ReleaseTime: 2024-04-16
There are various types of electric heating elements, including conventional varieties, electric heating alloys, electric heating materials, microwave heating devices, stainless steel electric heating plates, electromagnetic induction heating devices, electric heating tubes, electric heating wires, electric heating plates, electric heating belts, electric heating cables, electric heating coils, electric heating rods, electric heat tracing belts, electric heating cores, mica heating plates, ceramic heating plates, tungsten molybdenum products, silicon carbon rods, molybdenum powder, tungsten bars, electric heating wires, mesh belts, and many other types of electric heating elements.
Electric heating castings are another classification of electric heating components, such as cast aluminum, cast copper, cast iron heaters, PTC heating elements, and steam heat dissipation tubes. The resistance band far-infrared radiation heater is used for heating equipment in drying channels, drying rooms, and ovens, as well as related industries such as cable trays, electric heaters, electric boilers, electric heating tubes for boilers, electric heating tubes for ovens, finned electric heating tubes, explosion-proof electric heaters, storage tank electric heaters, high-temperature ceramic electric heaters, molecular sieve electric heaters, circulating electric heaters, tracked electric heaters, hot water and electricity heaters, and fluid circulating electric heaters.
1. Electric heating wire
Electric heating wire is the earliest type of electric heating element that uses electric heating as the basic working principle to achieve conversion. Although electric heating wires are traditional heating elements, they have not been replaced yet. Nowadays, electric heating wires are still widely used in various fields, especially in industrial production and laboratories. In recent years, electric heating wires have mostly used iron chromium aluminum alloy and nickel chromium alloy, and the maximum temperature of iron chromium aluminum alloy has reached 1400 ℃. On the basis of electric heating wire, electric heating elements such as electric heating rods, electric heating plates, and electric heating plates have been developed in recent years. However, their essence is still electric heating wire, and their principle cannot be separated from electric heating. The advantages of electric heating wire are high heating temperature and heat resistance temperature, mature technology, easy manufacturing, and convenient matching application in various electric heating equipment. The disadvantage of electric heating wire is that its conversion rate is low, and the heating process is accompanied by the luminescence process, so the energy conversion rate can only reach 60% to 70%.
2. PTC electric heating element
The full name of PTC is Positive Temperature Coefficient, also known as thermistor. It is a type of electric heating element made by composite sintering of conductive materials. PTC electric heating element is a type of electric heating element that emerged after the relay heating wire. Due to the limitation of Curie temperature, it can only be used in heating below 350 ℃ and is used in various low-power low-temperature electric heating equipment. The advantage of PTC electric heating elements is that there is no open flame during heating, and the heating efficiency can reach 70%. The disadvantage of PTC electric heating elements is poor seismic performance and cannot be cut and used arbitrarily. Especially, PTC electric heating elements are limited by Curie temperature and cannot be used for heating above 350 ℃. Therefore, the application of PTC electric heating elements in practical production and life can only be limited to the field of low-temperature heating.
3. Conductive coating
Conductive coatings, also known as black films, emerged in the late 1950s and can be used as electric heating elements after being sprayed on the surface of insulating materials. Conductive coatings have many uses, but their application as electric heating elements is relatively limited. Their advantages include surface heating, large heat dissipation area, and good seismic performance. However, their disadvantage is that the heating layer is prone to detachment and can only be used for heating below 200 ℃.
4. Electric heating film
Electric heating film is an emerging type of electric heating element in recent years, which is manufactured by drawing on the characteristics of PTC and conductive coatings. Electric heating film is currently mainly used in indoor heating and environmental temperature maintenance, such as building heating and insulation in nursery rooms. The advantages of electric heating film are no open flame heating, surface heating, low thermal resistance, fast thermal conductivity, long service life, and easy cutting and separation. Especially, the electric energy conversion efficiency of electric heating film is as high as 90%, and the heat loss is small. The disadvantages of electric heating film are slow heating speed, the heating temperature cannot reach a high value, and the heat dissipation speed is fast after power outage.
