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Electric heating trace designing

1、Calculate Heat Loss
Technics terms:
  ⑴ Maintain Temperature(Tm)  
⑵ The lowest Environment Temperature(Ta) 
⑶ Tube diameter 
⑷ Heat-insaluting material 
⑸ Heat insulation thickness 
⑹ Safety factor
Q Heat Loss of the Tube Per Meter(W/m)=q×△t×K
Hereinto:
  q:Tube heat loss(the heat loss of tube per meter changing 1℃, see the upper table on page 4 )
  △t=Tm-Ta
  K:the heating quotiety for each kind of heat-insaluting material (see the lower table on page 4 )
For example:
  Tm=30℃
Ta=-10℃
Tube Diameter=100mm
Heat-insaluting material:glass fibre
The thickness of heat insalution:25mm
△t=Tm-Ta=30-(-10)=40
K=0.040(See table “the heating quotiety for each kind of heat-insaluting material”)
q=18.87(See table“Tube Heat Loss q”)
Q=18.87×40×0.040W/m
QThe Heat Loss for Store Tank (W)=q×Δt×K×S
  S:The surface area of the store pot m2
2、Select Cable
The Specification for kinds of Electric Heat tracing Cable
Specification
LV
HV
HHV
CWM
CWH
MI
SRCM
Skin Effect
Max Heat tracing
Temperature(℃)
65
110
190
150
205
590
180
200
Max Wattage(W/m@10℃)
24.3
41.3
85
40
60
210
60
100
Max using length(m)
170
120
69
210
140
3000
700-5000
24000
Max Working Voltage(V)
220
220
220
380
380
600
660
8000
Using for Dangerous Aera
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Using for Plastic Tube
Yes
No
No
No
No
No
No
No
Local cutting
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Local connecting
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Overlap fixing
Yes
Yes
Yes
No
No
No
No
No
Output Wattage while
Temp. changing
Yes
Yes
Yes
No
No
No
No
No
Output Wattage while
Length changing
Yes
Yes
Yes
No
No
No
No
No
System Designig
Simple
Simple
Simple
Simple
Simple
Complex
Complex
Complex
System Fixing
Easy
Easy
Easy
Simple
Simple
Complex
Simple
Simple
Anti-damage
No
No
No
No
No
OK
No
No
Max Outline Size(mm)
5.3×12.6
4.6×11.7
11×6
11×6
¢3~11

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