What is the working principle of an air heater?

What is the working principle of an air heater?

The air electric heater is mainly used to heat the required air flow from the initial temperature to the desired air temperature, with a maximum of 850 ℃. It has been widely used in many research and production laboratories such as aerospace, weapons industry, chemical industry, and higher education institutions. Especially suitable for automatic temperature control and high flow high temperature combined systems and accessory testing. The range of use of air electric heaters is wide: they can heat any gas, and the generated hot air is dry, non conductive, non combustible, non explosive, non chemically corrosive, pollution-free, safe and reliable, and the heated space heats up quickly (controllable).

The working principle is to install a primary coil with more turns and a secondary coil with fewer turns on the same iron core. The voltage ratio between input and output is equal to the ratio of coil turns, while the energy remains constant. Therefore, the secondary coil generates a large current under low voltage conditions. For induction heaters, the bearing is a short circuited single turn secondary coil that generates a large amount of heat under low AC voltage conditions through a large current. The heater itself and magnetic yoke are kept at room temperature. Due to the induction of current by this heating method, the bearing will be magnetized. It is important to ensure that the bearings are demagnetized in the future, so that they do not absorb metal magnetic debris during operation. Fag induction heaters have automatic demagnetization function.

It is the use of metal to generate eddy currents in an alternating magnetic field to generate heat, usually used in metal heat treatment and other aspects. The principle is that when thicker metals are in an alternating magnetic field, they will generate current due to electromagnetic induction. After the thicker metal generates current, the current will form a spiral flow path inside the metal, so that the heat generated by the current flow is absorbed by the metal itself, which will cause the metal to quickly heat up.

Uniformly distribute high-temperature resistance wires in high-temperature resistant stainless steel seamless pipes, and densely fill the gaps with crystalline magnesium oxide powder with good thermal conductivity and insulation performance. This structure is not only advanced, high thermal efficiency, but also generates uniform heat. When there is current passing through the high-temperature resistance wire, the heat generated diffuses through the crystalline magnesium oxide powder to the surface of the metal pipe, and then transfers to the heated part or air to achieve the purpose of heating.

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