Drying kinetics and mathematical modeling of hot air drying of coconut coir pith

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Table 2 Model constant and statistical results for hot air drying of coir pith

Model	Velocity (m/s)	Model constants			R²	\({\upchi }^{2} \times 10^{ - 2}\)	RMSE	E%
Model	Velocity (m/s)	a	b × 10²	c × 10²	R²	\({\upchi }^{2} \times 10^{ - 2}\)	RMSE	E%
MR = 1 + at + bt ². (Wang and Singh model)	2.5	−0.01282	0.002552		0.9981	0.0297	0.0149	21.45
	2	−0.01174	0.001763		0.9977	0.0354	0.0175	23.95
	7	−0.01118	0.001589		0.9974	0.0430	0.0193	27.97
	1.4	−0.01120	0.001875		0.9959	0.0708	0.0248	54.84
MR = a + bt (Linear model)	2.5	0.96816	−1.03312		0.9931	0.1077	0.0284	82.19
	2	0.97749	−0.99589		0.9948	0.0782	0.0247	60.52
	1.7	0.98372	−0.95776		0.9938	0.0944	0.0271	69.26
	1.4	0.98068	−0.92965		0.9895	0.1585	0.0351	102.52
\(MR = \frac{{\left( {1 + at + bt^{2} } \right)}}{{\left( {1 + ct} \right)}}\) (proposed model)	2.5	−0.01926	0.00925	−0.7306	0.9988	0.0221	0.0111	7.26
	2	−0.01896	0.00899	−0.7923	0.9987	0.0241	0.0126	7.77
	1.7	−0.01827	0.00836	−0.7766	0.9987	0.0249	0.0128	16.15
	1.4	−0.01799	0.00810	−0.7677	0.9986	0.0291	0.0149	5.67