On 2018-08-08 14:48:54
Resistance wire heating principle
How do you use resistance wire for heating? Can not be directly connected to the power supply ah! Do you still use insulation on the outside? Urgent need!
Resistance heating is the electrical heating of an object using the heat generated by the Joule effect of current flowing through a conductor. Resistance heating can be divided into indirect resistance heating and direct resistance heating.
Indirect resistance heating means that the electric current passes through the electric heating element or conductive medium, such as resistance wire, thermistor (PTC), electric heating film, etc., so that the electric heating element heats up at first. Then, the heat generated by the electric heating element is used to indirectly heat the target object by means of heat conduction, heat convection or heat radiation. The traditional method of using electric heating elements embedded in the mold to heat the mold belongs to indirect resistance heating.
In the traditional heating industry, resistance wire and quartz heating method are generally chosen. However, this traditional heating method has low thermal efficiency. Resistance wire and quartz are heated mainly by electrification and then transfer the heat to the feed cylinder.
Then it ACTS as a heating material. The maximum heat utilization rate of this heating effect is only about 50%, while the other 50% or so heat is released into the air. All the traditional resistance wire heating methods lose more than 50% of the electric energy.
Reference source: Baidu Baike - Resistance heating