Parameter Optimization and Prediction Model of Induction Heating for Large-Diameter Pipe

Table 6

Range analysis results of orthogonal test for pipe’s outer wall temperature.

	Outer Wall Temperature (°C)			Inner Wall Temperature (°C)
	Current Frequency	Current Density	Air Gap	Current Frequency	Current Density	Air Gap
K1	568.6	557.4	1180.6	118	117.6	184.8
K2	747.2	642.4	1021.2	137.2	129.4	170.6
K3	867.4	840.4	835.2	151	150	151
K4	976.2	1001.2	670	165.8	167.8	132.4
K5	1049.2	1167.2	501.6	178.8	185.8	112
R	480.6	609.8	679	60.8	68	72.8

Note: K₁~K₅ represent the average temperature of each factor at each level, and R is range.