Why pay attention to its surface load when designing electric heating tubes?

Why pay attention to its surface load when designing electric heating tubes?

Anyone who has used it knows that each heating tube has its own voltage and power. Because the cost of our heating tube is calculated based on the length, tube diameter, material and other parameters, some customers think that since the cost is calculated according to this, then my unit length power should be larger, so it saves money and can achieve The need for heat. It is correct to think this way, but in this case, the surface load of the heating tube will increase and the life will be affected. Today, I will explain to you why we should pay attention to its surface load when designing electric heating tubes.

1. Definition of surface load:

Surface load refers to the amount of power shared per unit area on the surface of the heating element, expressed in W/cm2.

2. Calculation formula of surface load:

Power W/[pipe diameter (cm)*3.14*L(cm)]

According to the electric heating tube production standard, the power per meter of the water heating heating tube should be between 1-4KW, oil heating between 1-2KW, and air heating between 1-1.5KW. The greater the power exceeding this standard .The life of the heating tube will be shorter. Under the same conditions, the greater the power, the greater the surface load. The surface load is an important criterion for measuring the surface temperature of the heating tube. If the surface load is too large, the surface temperature of the heating tube will be higher, and the internal temperature of the heating tube will inevitably increase. When the internal temperature of the heating tube increases to a certain extent, the resistance wire in the tube will burn In severe cases, the tube will burst due to thermal expansion.

After the above description, I think you should know why you should consider the surface load of the heating tube when designing the heating tube, because the surface load greatly affects the life of the heating tube.