Table 3.

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

Model	Reference	Dryer type	Constant	Adjusted R2	RMSE
Newton	[17]	Direct dryer	k = 0.4729	0.9836	0.0409
		Indirect dryer	k = 0.4431	0.9779	0.0471
Page	[18]	Direct dryer	k = 0.8212; n = 0.4846	0.9959	0.0204
		Indirect dryer	k = 0.803; n = 0.4592	0.9955	0.0211
Henderson and Pabis	[8]	Direct dryer	a = 0.9884; k = 0.4679	0.9814	0.0435
		Indirect dryer	a = 0.9859; k = 0.4372	0.9751	0.0500
Logarithmic	[19]	Direct dryer	a = 0.9563; k = 0.5252; c = 0.03697	0.9901	0.0318
		Indirect dryer	a = 0.9471; k = 0.5024; c = 0.04514	0.9885	0.0340
Two – term	[20]	Direct dryer	a = 0.8171; b = 0.1831; ko = 0.7579; k1 = 0.07181	0.9982	0.0134
		Indirect dryer	a = 0.4683; b = 0.5316; ko = 10.51; k1 = 0.2213	0.9827	0.0416
Two – term exponential	[20]	Direct dryer	a = 0.2922; k = 1.232	0.9878	0.0352
		Indirect dryer	a = 0.2825; k = 1.195	0.9826	0.0417
Midilli and Kucuk	[19]	Direct dryer	a = −0.1406; b = 0.00386	0.3311	0.2610
		Indirect dryer	a = −0.1377; b = 0.003762	0.3547	0.2545
Diffusion approach	[15]	Direct dryer	a = 3.015; b = 0.9973; k = 0.4701	0.9781	0.0473
		Indirect dryer	a = 3.442; b = 0.9982; k = 0.4409	0.9706	0.0543
Verma et al.	[21]	Direct dryer	a = 0.1831; g = 0.7578; k = 0.07181	0.9985	0.0122
		Indirect dryer	a = 0.2026; g = 0.7516; k = 0.06631	0.9985	0.0125
Modified Henderson and Pabis	[9]	Direct dryer	a = 0.1865; b = 0.8865; c = −0.07296; g = 0.8034; h = 11.97; k = 0.07233	0.9971	0.0171
		Indirect dryer	a = −9.383; b = 9.81; c = 0.568; g = 0.2281; h = 1.027; k = 0.2298	0.9741	0.0510