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Types and characteristics of electric heating elements

Time:2018-01-10 16:51

Types and characteristics of electric heating elements

Electric heating element is a kind of component that can convert electric energy into heat energy. All kinds of electric heating equipment should use electric heating element to heat up. Electric heating elements have played an important role in the production and life of people from the day they came out. Today, let's look at the types and advantages and disadvantages of electric heating elements.
1, electric hot wire electric wire is the first kind of electric heating element, it is based on the basic principle of electric heating to achieve energy conversion. Although the electric heating wire is a traditional electric heating element, it has not yet been replaced. Now the electric heating wire is still widely applied in various fields, especially in industrial production and laboratories. The electric wire is made of Fe Cr and Ni Cr alloy in Aluminum Alloy in recent years, the highest temperature of Fe Cr Aluminum Alloy has reached 1400 C. On the basis of electric heating wire, electric heating elements such as electric heating rods, electric heating plates and electric heating sheets have been developed in recent years, but their essence is still electric heating wires, and their principles can not be separated from electric heating. The advantages of electric hot wire are high heating temperature and heat - resistant temperature, mature technology, easy to manufacture and convenient to be applied to various electric heating equipment. The disadvantage of electric wire is that its energy conversion rate is low, the heating process is accompanied by the process of luminescence, so the conversion rate of electric energy can only reach 60% to 70%.
2, the full name of PTC electric heating element PTC is Positive Temperature Coefficient, that is, thermistor. It is an electric heating element made of composite material sintered by conductive material. PTC electric heating element is an electric heating element which appears after the hot wire. It is limited by Curie temperature. It can only be used in the heating below 350 degrees. It is applied to all kinds of low power low temperature electrothermal equipment. The advantage of PTC electric heating element is that there is no open fire when heating, and the heating efficiency can reach 70%. PTC heating element disadvantage is the poor seismic performance, can not cut the use, especially the PTC heating element by Curie temperature limitations, can not be used for heating above 350 DEG C, so that only the application of PTC heating element in the actual production of life limitations in the field of low temperature heating.
3, conductive paint conductive coating is also known as black film. It was born in the late 1950s, and it can be used as an electric heating element when it is sprayed on the surface of insulating material. The conductive coating itself has many uses, and its application as an electric heating element is less. Its advantages are surface heating, large heat dissipation and good seismic performance, but the drawback is that the heating layer is easy to fall off, and it can only be applied to heating below 200 degrees.
4. Electrothermal film electrothermal film is a newly emerging electric heating element in recent years. It is made from the characteristics of the two kinds of electric heating elements that absorb PTC and conductive coatings. Electric heating film is mainly used in indoor heating and environmental temperature maintenance, such as building heating, brooding room insulation, and so on. The advantages of the electrothermal film are no open flame heating, surface heating, less thermal resistance, fast heat conduction, long service life, and easy cutting and separation. Especially, the electric energy conversion efficiency of the electrothermal film reaches 90% and the heat loss is small. The disadvantage of the electrothermal film is that the heating speed is slow, the heating temperature can not reach the higher value, and the heat dissipation speed is fast after the blackout.


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