How to calculate surface load heater ?

In the article you will understand what is the surface load, how to calculate surface load.

The surface load tell us about the force given by the square centimeter of the heaters surface.

To calculate the surface load of the heater you must:

1. Calculate the lenght of the heater in it's straight form (if the heater has any other shape than straight).

The lenght of the heater on the bow you can calculate by the axis of the heating element - inner radius + half the diameter.

2. From the lenght in the straight form you should take the lenght of the "dead spots" from both sides of the heater.

3. Because the geometric figure of the heater is a roller we must calculate the surface field of the side wall of the roller (without the basis) - shown with a patern: Pb = 2πrH

where:

Pb - the side surface field of the heater (surface of the heater)

r - radius (half diameter of the heater)

H - the lenght of the heater in it's straight form (without the dead spots)

4. The force of the heater in watt [W] we divide by the calculated heaters surface [Pb] shown in the square centimeters [cm2]

The surface weight tell us mostly about using the specific heater for heating the specific thing.

Besides diffrent materials are used to create diffrent heating elements and have diffrent maximum heating power what translates to diffrent atributes in the table below. The table contains informations about the maximum surface weight of the heater for the current thing. For the maximum living period of the heater the important thing is that the weight were't lover than the one shown in the table below:

The above data are general and informing. The heater working in a open room will have a diffrent load than the heater working in an closed chamber.