The surface load refers to the number of powers per unit area on the surface of an electrothermal alloy element such as a heating wire or a nickel-chromium wire. The choice of surface load is closely related to the material, specification, degree of opening and closing, construction, working temperature, heating medium, medium temperature, heat transfer method, material of the supporting member and switching frequency. Under the same working conditions, the choice of a larger surface load means that less alloy material is used, the surface temperature of the component is higher, but the service life is shorter. Conversely, if a smaller surface load is used, the material can be lowered. The surface temperature, which extends the life of the component, requires an increase in the amount of material used. Therefore, the correct selection of the surface load can save the electrothermal alloy material and ensure a long service life.
The most common type of heating element for heating wire is to generate heat after energization and convert electrical energy into heat. The application range of electric heating wire is very wide. Many common electric heating equipments use electric heating wire as heating element. Therefore, electric heating wire has applications in medical, chemical, electronics, electrical, metallurgical machinery, ceramic glass processing and other industries.
1. Working principle of electric heating wire The working principle of electric heating wire is the same as that of other metal heating elements, and it is the electric heating phenomenon after metal is energized. Electrothermal means that after the current passes through the conductor, the current generates a certain amount of heat and is transmitted by the conductor. The heating wire itself is a metal conductor that emits heat and provides thermal energy when energized.
2. Types of electric heating wire The type of electric heating wire is divided according to the chemical element content and organizational structure of the heating wire. The types of electric heating wire are iron chromium aluminum alloy electric heating wire and nickel chromium alloy electric heating wire. These two kinds of heating wires are used as electric heating elements and have different functional characteristics.