Design principles of water tank electric heating tubes

The required power of the water tank electric heating tube varies depending on the amount of water in the water tank, the temperature difference, and the time required for heating. Generally, single-head electric heating tubes, U-shaped electric heating tubes, or other special-shaped electric heating tubes can be used for low power; special immersion liquid heating tubes, which are commonly known as flange heating tubes (flat flange heating tubes or threaded flange heating tubes), can be used for high power.

When the water tank electric heating tube has low power, the following design principles should be considered:

(1) The ratio of the total length of the heating zone of the heating tube to the power is 1:2 or 1:3, and the limit is 1:4, that is, one meter of heating length can be 2KW, 3KW, or at most 4KW. For the same length, the greater the power, the faster the scaling speed and the shorter the life. Therefore, to extend the life of the water tank heating tube, the power per meter should be reduced.

(2) Consider the installation method of the water tank electric heating tube: horizontal installation or vertical installation. Considering the installation method is mainly to consider the non-heating area of ​​the water tank electric heating tube to avoid dry burning of the water tank electric heating tube during operation.

(3) Low-power water tank electric heating tubes generally use U-shaped electric heating tubes, W-shaped electric heating tubes, double U-shaped electric heating tubes, threaded single-head electric heating tubes, etc.

(4) Low-power water tank electric heating tubes can generally be controlled by a control cabinet or not.

When the water tank electric heating tube is high-power, consider the following design principles:

(1) As with the first point of the low-power water tank electric heating tube, the same proportional relationship is used to determine the total length of the heating zone of the electric heating tube.

(2) After the total length of the heating zone is determined, we determine the length of the water tank electric heating tube after forming according to the size of the water tank and the installation method. Based on this length, determine how many U-shaped tubes are needed to be fixed on the flange.

(3) Confirm the size of the flange based on the number of U-shaped tubes. If there are 3 U-shaped tubes, threaded flanges or flat flanges can be used. Generally, flat flanges are suitable for more than 3 U-shaped tubes.

(4) The number of U-shaped pipes is usually 1, 2, 3 or multiples of 3. We need to consider the convenience of wiring.

(5) For safety reasons, high-power water tank electric heating pipes are generally equipped with a control cabinet to control the temperature and leakage protection.