What are the operating methods for heating objects with an electric heater

What are the operating methods for heating objects with an electric heater

The method of using an electric heater to heat an object is very simple, which is to use the Joule effect generated by the current to effectively convert electrical energy into thermal energy to heat the material. This heating method can also be divided into two types: direct resistance heating and direct resistance heating, with different detailed requirements

If direct resistance heating is used for the electric heater, the power voltage can be directly applied to the heated object. When the current flow expires, the heated object itself can generate heat. From this perspective, objects that can be directly heated by resistance must be conductors and have a high electrical resistivity. Because heat occurs within the object being heated, the thermal efficiency is bound to be high.

The direct resistance heating of electric heaters requires heating elements made of specialized alloy materials or non-metallic materials, which then generate heat energy and transmit it to the heated object through radiation, convection, and conduction methods.

For electric heaters, the heated object and heating element are divided into two parts, so the variety of heated objects is generally not limited and the operation is simple. Only high requirements are required for the data used for heating elements. Under normal circumstances, it is necessary to be satisfied with requirements such as high resistivity, low resistance temperature coefficient, small deformation at high temperatures, and not simple embrittlement.

So, in electric heaters, metal materials such as iron aluminum alloys, nickel chromium alloys, or non-metallic materials such as silicon carbide and molybdenum disilicide are often used as manufacturing materials for heating elements, and the working temperature between the materials is also different.

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