Calculation of Total Heat Load Required to Raise at Maintain Temperature

 

Calculation of Total Heat Load Required to Raise at Maintain Temperature

 

Heat Up for Product: -

Q1 = (P1 x Vc1 X Cp1 X (Tm-Ta)) / 860*T

 

If we consider mass here then:-

Q1 = (m X Cp1 X (Tm-Ta))/860*T

 

Because

m = P1 x Vc1

 

Heat Up for Pipe:-

Q2 = (m X Cp2 X (Tm-Ta)) / 860*T

 Where

Q1 = Heat Up for Product in Pipe (W/hr)

P1 = Density of Product (kg/m3)

Vc1 = Volume of Product (m3)

Cp1 = Specific Heat of product (kcal/kg ⁰C)

Tm = Maintenance Temperature (◦C)

Ta = Minimum Ambient Temperature (◦C)

T = Time Period to Raise the Temperature (hr)

m = Mass of Product

Q2 = Heat Up for Pipe

Cp2 = Specific Heat of pipe (kcal/kg ⁰C)

 

Calculation of volume: -

Vc1 = 3.14*r2*l

Where

Vc1 = Volume of Product (m3)

r = Radius of Pipe

l = Length of Pipe

 

Qi = K X N X (Ti – Ta)

Where

Qi = Heat Loss on Pipe Surface @ Initial Temperature(W/m)

Ti = Initial Temperature (◦C)

K = Thermal Conductivity (W/m ◦C)

N = Normalization Factor (Consider Value from Table V of Bs6351 Part 2)

Ta = Minimum Ambient Temperature (◦C)

 

Qf = K X N X (Tm-Ta)

Where

Qf = Heat Loss on Pipe Surface @Final Temperature(W/m)

Tm = Maintenance Temperature (◦C)

K = Thermal Conductivity (W/m ◦C)

N = Normalization Factor (Consider Value from Table V of Bs6351 Part 2)

Ta = Minimum Ambient Temperature (◦C)

 

Q3 = (Qi + Qf) / 2

Where

Q3 = Average Heat Loss on Pipe Surface (W/m)

Qi = Heat Loss on Pipe Surface @ Initial Temperature (W/m)

Qf = Heat Loss on Pipe Surface @Final Temperature (W/m)

 

Total Heat Load Required Raising at Maintain Temperature

Q = Q1 + Q2 +Q3

Q = Total Heat Load required raising at Maintain Temperature