Design calculation formula for electric heating tubes:

Design calculation formula for electric heating tubes:

1. Power required for initial heating of electric heating tubes

KW=(C1M1 △ T+C2M2 △ T) ÷ 863/H+P/2

In the formula, C1C2 represents the specific heat of the container and medium (Kcal/Kg ℃), respectively

M1M2 represents the mass of the container and medium, in kilograms

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

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

Heat dissipation of container at final temperature P (Kw)

2. The power required for maintaining the temperature of the medium in an electric heating tube

KW=C2M3 △ T/863+P

In the formula, the added medium kg/h per hour for M3 (kg/hour)

3. Quick calculation formula for electric heating tubes

(1) Power required for static water and oil heating (excluding container heat consumption) Kw=CM △ T/863/H

C: Specific heat kilocalorie/(kg. ℃)

M: Mass kg △ T

H: Time: hours.

(2) Power required for flowing water and air-cooled cast aluminum heating coil oil heating (excluding container heat consumption) Kw=CF △ T/14

C: Specific heat kilocalorie/(kg. ℃)

M: Flow rate kg/min △

T: Temperature difference ℃.

(3) Channel type air heating (atmospheric pressure) Kw=F △ T/40

M: Flow rate in meters per minute

△ T: Temperature difference ℃

40: Coefficient in kilowatts per minute (m3/minute)

Vout=Vin (Tout+273)/(Tin+273)

Vin, Vout: Channel inlet and outlet flow velocity

1. Calculate the power required for an electric heating tube to heat from the initial temperature to the set temperature within a specified time

2. Calculate the actual power required to maintain the temperature of the electric heating tube while maintaining the constant temperature of the medium

3. Based on the above two calculation results, select the model and quantity of electric heating tubes. The total power is taken as the maximum of the two types of power and the coefficient of 1.2 is considered.

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