Calculation of surface power of electric heating wire
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How is the surface power of a heating wire calculated? What is the relationship between surface power and its diameter and length (the calculation formula)? This post was last edited by vivo1314 on 2009-4-13 00:32
The formula for calculating electrical power is: P=U^2/R (derived from Ohm’s law, where I=U/R; thus P=U·U/R=U^2/R). The resistance R is equal to the material density multiplied by (length divided by cross-sectional area), i.e., R=ρ×(L/S). However, it seems inappropriate to ask this question in this forum. The relationship between electrical power and the size of components can be understood using these two formulas. Last edited by wode*aohei on 2009-4-13 at 10:38
Surface power calculation = Power used by the heating wire / Surface area of the heating wire * Length over which heat is generated. For example, in the case of a 1000W heating wire with a diameter of 1.2 mm and a heating length of 900 mm, the surface power is calculated as: 100 * 1000 / (3.14 * 1.2 * 900) = 29.4 W/cm2