Single-head electric heating tubes can use voltage regulators to change the heat generation by changing the input voltage and current. The heat generated is proportional to the square of the voltage and proportional to the square of the current. When the voltage becomes 1/2 of the original, the heat generation becomes 1/4 When the current becomes 1/2 of the original, the heat generation also becomes 1/ First, the design and calculation of the heating tube is generally carried out according to the following three steps:
1. Calculate the power required to heat from the initial temperature to the set temperature within a specified time
2. Calculate the actual power required to maintain the temperature under the premise of maintaining the temperature of the medium
3. According to the above two calculation results, select the model and number of heaters. The total power is taken as the maximum value of the above two powers and the coefficient of 1.2 is considered.
Formula:
1. The power required for initial heating KW = ( C1M1T + C2M2T )÷ 864/P + P/2
Formula: C1C2 is the specific heat of the container and the medium (Kcal/Kg°C)
M1M2 mass of container and medium (Kg) respectively
T is the difference between the desired temperature and the initial temperature (°C)
H is the time required for the initial temperature to heat up to the set temperature (h)
P: Heat dissipation of the container at final temperature (Kw)
2. The power required to maintain the temperature pump of the medium KW=C2M3T/864+P
Formula: M3 increases the amount of medium kg/h per hour
