Table 2.

Modeling of moisture ratio according to the drying time for the thin layer natural convection solar drying of mint.

Model	Reference	Dryer type	Constant	Adjusted R2	RMSE
Newton	[17]	Direct dryer	k = 0.1989	0.9797	0.0464
		Indirect dryer	k = 0.1646	0.9738	0.0532
Page	[18]	Direct dryer	k = 0.3026; n = 0.7241	0.9886	0.0348
		Indirect dryer	k = 0.2563; n = 0.7315	0.9882	0.0357
Henderson and Pabis	[8]	Direct dryer	a = 0.9815; k = 0.1941	0.9776	0.0488
		Indirect dryer	a = 0.9718; k = 0.1575	0.9715	0.0555
Logarithmic	[19]	Direct dryer	a = 0.9454; k = 0.2192; c = 0.04707	0.9880	0.0357
		Indirect dryer	a = 0.9343; k = 0.187; c = 0.0579	0.9853	0.0398
Two – term	[20]	Direct dryer	a = 0.6803; b = 0.3243; ko = 0.3293; k1 = 0.06829	0.9913	0.0305
		Indirect dryer	a = 0.5676; b = 0.4399; ko = 0.3281; k1 = 0.06957	0.9897	0.0334
Two – term exponential	[20]	Direct dryer	a = 0.316; k = 0.4413	0.9850	0.0399
		Indirect dryer	a = 0.2895; k = 0.3955	0.9836	0.0422
Midilli and Kucuk	[19]	Direct dryer	a = −0.1083; b = 0.002588	0.7839	0.1514
		Indirect dryer	a = −0.09901; b = 0.002282	0.8335	0.1342
Diffusion approach	[15]	Direct dryer	a = 0.6785; b = 0.2089; k = 0.3257	0.9925	0.0283
		Indirect dryer	a = 0.5711; b = 0.2163; k = 0.3173	0.9911	0.0310
Verma et al.	[21]	Direct dryer	a = 0.3239; g = 0.327; k = 0.06834	0.9925	0.0283
		Indirect dryer	a = 0.4357; g = 0.3215; k = 0.06928	0.9911	0.0310
Modified Henderson and Pabis	[9]	Direct dryer	a = 7.973; b = 0.2351; c = −7.205; g = 0.8349; h = 0.1578; k = 0.1563	0.9671	0.0591
		Indirect dryer	a = 0.7433; b = 67.29; c = −67.04; g = 0.8272; h = 0.8287; k = 0.1095	0.9711	0.0559