How to choose electric heating tube? You need to start from these aspects

How to choose electric heating tube? You need to start from these aspects

First, the selection of electric heating tube needs to consider power:

Through standardized calculation, you can consider the following three steps:

1. Calculate the actual power required to maintain the temperature under the premise of maintaining the medium temperature unchanged

2. Calculate the power required to heat from the initial temperature to the set temperature within the specified time

3. According to the above two calculation results, select the model and quantity of the heater.

It is recommended that the maximum value of the total power should be taken above.

Reference formula:

Power required to maintain medium temperature KW=CM△T/864+P

Where: M is the medium added per hour kg/h

Power required for initial heating KW = (CM△T + CM△T)÷ 864/P + P/2 Where:

CC is the specific heat capacity of the container and the medium (Kcal/Kg℃) M1M is the mass of the container and the medium (Kg)

△T is the difference between the required temperature and the initial temperature (℃)

H is the time required to heat from the initial temperature to the set temperature (h)

P is the heat dissipation of the container at the final temperature (Kw) Performance curves often used in electric heating tube calculations.

Second, the selection of electric heating tubes needs to consider voltage:

The voltage specification of the electric heating tube will directly determine the resistance value of the device. The higher the voltage, the greater the power. If the wrong voltage is selected, it is particularly easy for the voltage to exceed the rated voltage of the electric heating tube, thereby causing the resistance wire to burn out or even the electric heating tube to burst.

The voltage specifications we often use are as follows: 24V, 36V, 48V, 110V, 220V, 380V. This voltage refers to the rated voltage.

It refers to the safe voltage for the electric heating tube that is specified and marked on the outer shell of the electric heating tube during design. Simply put, the rated voltage is the voltage set for the equipment when the customer requires us to produce it.

Generally, there are 24V, 48V, 110V, 220V, 380V, etc.

Working voltage of electric heating tube:

(1) Multi-branch series power supply, for a group of electric heating tubes or electric heating tubes with multiple branches connected in series to the power supply, the working voltage of the electric heating tube refers to the voltage connected to this group of electric heating tubes specified during design.

(2) Single-branch power supply, for electric heating tubes with a single-line power supply, the working voltage of the electric heating tube refers to the voltage connected to the component specified during design, that is, the rated voltage.

Note: This involves the issue of whether multiple electric heating tubes are connected in series or in parallel. Therefore, when judging the voltage, if multiple electric heating tubes need to be connected, it is necessary to consider whether to connect in series or in parallel in order to determine the voltage of a single electric heating tube.

The impact of voltage on power: When the power of the electric heating tube is determined, if the voltage is lower than the designed voltage, the power will decrease and the heating efficiency will decrease;

If the voltage is greater than the designed voltage, the power will increase, the load will be too high, and the internal heating wire may burn out, or even the electric heating tube may break down.

Therefore, when using it, we must also consider the connection problem of the circuit.