Why can't the surface temperature of the electrical tubular heater be completely uniform?

- Nov 19, 2020-

Why can't the surface temperature of the electrical tubular heater be completely uniform?


First of all, we know the structure of the electrical tubular heater. It uses a metal tube as the shell, and the spiral heating wires are evenly distributed in the center of the tube. The gap is tightly filled with magnesium oxide powder with insulation and thermal conductivity. Finally, the nozzle is sealed with silicone.


The electrical tubular heater is heated by the heating wire in the tube, and the thickness of the magnesium oxide powder in the gap is uneven, resulting in uneven surface temperature of the heating tube. Secondly, when the magnesium oxide powder is poured, the position of the heating wire in the center of the tube will be affected, which is another important reason for the uneven surface temperature of the heating tube.

electric water heater element 31

Therefore, the surface temperature of the electrical tubular heater cannot be completely uniform.