What is the impact of the external load of the electric heating wire on the electric heating wire

What is the impact of the external load of the electric heating wire on the electric heating wire

Some customers are unclear about the appearance load of the electric heating wire.

The external load of an electric heating wire is the power value shared by the electric heating wire per unit area, represented by symbols, at a rate of 2 watts per centimeter.

For high-temperature resistance furnaces, under the same power, selecting a higher external load means that the size of the selected electric heating wire can be smaller and the data can be saved. However, the appearance load is inversely proportional to the service life of the heating wire. If the appearance load selection is too high, data will not be saved, but will be wasted due to the decrease in lifespan. Therefore, the correct selection of external loads is an important factor in the rational use of electric heating data.

The selection of external load is closely related to the information, specifications, structure, operating environment temperature, heat dissipation capacity of the electric heating wire, as well as the atmosphere around the electric heating wire, the information of supporting components, and the frequency of heating and cooling in the main application. The allowable external load of electric wire components used in industrial resistance furnaces and civil electric heaters varies greatly due to their different uses and developments. Therefore, it is impossible not to provide such a universally applicable value for enterprises.

Testing of electric heating wire temperature

Test the appearance temperature of the wires, observe the color of the wires, then increase the temperature from dark red to bright red, and then from near yellow to white, reaching a dazzling blue white color. Based on this fact, the temperature of an object can be determined by the color of its luminescence. The hot wire has a high temperature (1100 degrees Celsius) and is yellow red in color. The hotline is hotter (1300 degrees Celsius) and yellow white. Bluish white (1500 degrees Celsius) or above can cause dizziness. Therefore, testing the appearance temperature of the wire is actually observing the change in its color.

An important parameter of electric heating wire is surface power. If the resistivity is too high, the surface power will be high after applying a certain current; If the resistivity is too small, the surface power will be very low after applying a certain current. Therefore, low-power appliances choose small diameters and small currents, but the magnitude of the current depends on the size of the resistance. The greater the current in the heating wire, the higher the temperature of the heating wire. On the contrary, the lower the current in the wire, the lower the temperature of the wire. The length and diameter of the heating wire were calculated using this method.

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