The heating wire of the cold storage door frame is not long-term energized. The principle of operation of the heating wire is based on Joule's law, which is that electric current converts electrical energy into thermal energy.
Electric heating means that after the current passes through the conductor, the current will generate a certain amount of heat and be transferred by the conductor. The heating wire itself is a metal conductor, which will emit heat after being energized, thereby providing heat energy to melt the frozen door seam, preventing the door seam from freezing to death.
The heating wire will automatically cut off the power after a period of power. The heating line will keep itself warm for a period of time, and after the temperature drops, it needs to be re-energized.
Heating wire trivia
Heating wire is generally divided into two categories, which are divided according to their different microstructure and chemical elements are iron-chromium-aluminum alloy series, the advantages of iron-chromium-aluminum alloy:
Long service life of the product;
The temperature used in the product is high, such as the maximum use temperature of HRE iron-chromium aluminum alloy wire in the atmosphere can reach 1400 °CC;
The oxidation resistance of the surface of the product is very good, and the A203 film formed after oxidation has good high resistivity and resistance;
And the allowable surface load is large; The specific gravity is also smaller than that of nickel-chromium alloy; The resistivity is also high; Good sulfur resistance;
The price is lower than that of Nichrome;
The other category is nickel-chromium alloy series, the advantages of nickel-chromium electric furnace wire:
1. The electric furnace wire cools down after long-term use, and its material will not become brittle;
2. Its strength is high at high temperature; Non-magnetic; The emissivity of nickel alloy after full oxidation is higher than that of iron-chromium-aluminum alloy.
3. In addition to sulfur atmosphere, it has a good corrosion resistance heating wire use range is very wide, a variety of electric heating equipment will use heating wire as a heating element.
