Table 2.

Regression coefficients of polynomial model for process variables (in coded units)

Variables/Factors	Estimated Coefficients
	ΔE	RR	H	Specific Energy
Constant	26.101	4.951	3123.850	68.433
V-Air Velocity	−0.026	0.057	−94.428	7.020
T-Air Temperature	0.782	0.052	218.678	2.259
M-Microwave Power	0.340	0.103	−367.122	−18.145
VT	0.398	−0.014	−262.450	0.937
VM	0.248	−0.016	−302.100	−1.547
TM	−0.165	−0.011	235.650	−0.982
V2	0.966	−0.002	−109.890	0.294
T2	0.833	0.006	164.414	−0.875
M2	0.317	−0.005	−147.261	−0.101
R2	0.92	0.93	0.83	0.99
CV (%)	1.89	0.87	10.82	3.12