1. The design calculation of heating tubes generally follows 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 medium temperature unchanged.
3. Based on the above two calculation results, select the model and quantity of the heater. The total power takes the maximum of the two powers and considers a factor of 1.2.
Formula:
1. Power required for initial heating
KW = ( C1M1△T + C2M2△T )÷ 864/P + P/2
Where: C1C2 are the specific heat of the container and medium respectively (Kcal/Kg℃)
M1M2 are the mass of the container and medium respectively (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)
2. Power required to maintain the medium temperature
KW=C2M3△T/864+P
Where: M3 is the medium added per hour (kg/h)
3. Heating tube environmental performance curve
