heating element design 123 part 2

 another way I use to design, is by considerin surface load first.

I take for heater fan application, the surface load is 15 to 20. i choose 19 for trial.

next i consider using 0Cr22Al6 wires.

from datasheet, cm2 per ohm, top right hand corner. 

Then Calculate a table of various wire diameter, the length, power and applied voltage.

As in this case, the applied voltage is 220V ac, you can see, how the diameter of wire is affecting the length and power.

As I want to achieve 1200W to 1800W, with length of ~5 m or less, the most suitable wire us 0.45 (less common) to 0.6mm