The way electric heaters are used to heat objects is very simple, that is to use the Joule effect generated by the current to effectively convert electrical energy into heat energy to heat materials. Such a heating method can also be divided into direct resistance heating and indirect resistance heating, and the specific requirements are different.
If the electric heater adopts direct resistance heating, the power supply voltage can be directly applied to the object to be heated, and when there is current flowing, the object to be heated can heat itself. From this point of view, the object that can be directly heated by resistance must be a conductor, and it must have a high resistivity. Since the heat is generated from the heated object itself, the thermal efficiency is bound to be high.
The indirect resistance heating of electric heaters requires a heating element made of special alloy material or non-metallic material, and then the heating element generates heat energy and transmits it to the heated object by means of radiation, convection and conduction.
For electric heaters, the object to be heated and the heating element are divided into two parts, so the types of objects to be heated are generally not limited, and the operation is simple. It is just that the material used for the heating element has high requirements. Under normal circumstances, it must meet the requirements of high resistivity, small temperature coefficient of resistance, small deformation at high temperature and not easy to embrittle.
Therefore, metal materials such as iron-aluminum alloy, nickel-chromium alloy, or non-metallic materials such as silicon carbide and molybdenum disilicide are often used as heating elements in electric heaters, and the working temperature between materials is also different. Not the same.
Jiangsu Weineng Electric Co.,Ltd is profession manufacturer of various types of industrial electric heater, everything is customized in our factory, Should you have any questions please feel free to come back to us.
Contact: Lorena
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Post time: May-18-2022