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Heanjia Super-metals Co., Ltd.
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Company Info
Heanjia Super-metals Co., Ltd. [China (Mainland)]
Business Type:Manufacturer, Trading Company
City: Beijing
Province/State: Beijing
Country/Region: China (Mainland)
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Jialiang Zhao:
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Tools
Resistance Heating Wire-Designing a Tape Element
The method is similar to that used in designing a round wire element.
Where:
b | Tape width (mm) |
t | Tape thickness (mm) |
Example:
1. To calculate the tape size and length required for a 600w/220v mica-wound element in a band heater, operating at a maximum temperature of 800oC, the total resistance of the element at operating temperature (Rt) will be:
2. Using RW80 tape, the Temperature Resistance Factor (F) at 800oC is 1.051. Thus, the total resistance of the element at 20oC (R) will be:
3. Knowing the dimensions of the mica-board, the length of the tape that may be wound round it may be estimated. Thus, the resistance required per meter of tape will be:
For example a length of tape of 7 meters -
4. A tape size of 1.1mm x 0.09mm has a resistance per meter of 11.10 ohms/m which is near to 10.97 ohms/m.
5. To verify the actual tape length (L)
A change in tape length may mean adding or subtracting turns (altering the pitch of the tape) to achieve the total resistance value required.
6. To verify the surface area loading (S):
If your calculated surface area loading is too high or low you should re-calculate changing one or more of the following:
- The tape length and size
