$D_{eff}$	Effective moisture diffusion coefficient (m2/s)
$E_t$	Total energy input to dryer (MJ)
$EU$	Total energy consumption
$E_{evap}$	Energy consumed to evaporate moisture from drying samples (kJ)
$E_{heating}$	Energy for the material heating (kJ)
M	weight of the sample (g)
Mf	weight of pycnometer (g),
$M_b$	Initial moisture content (kg water/kg dry matter)
$M_e$	Equilibrium moisture content (kg water/kg dry matter)
$M_t$	Moisture content at any time (kg water/kg dry matter)
$MR$	Moisture ratio
Msf	weight of the toluene for filling the pycnometer (g)
Mt+s	weight of pycnometer plus the weights of the sample and toluene (g)
$N$	Number of data values
R 2	determination coefficient
$S_b$	Shrinkage (%)
$SEC$	Specific energy consumption (MJ/kg)
$S_k$	Predict data
$t$	Drying time (min)
$T_k$	Experimental data
$T_m$	average predicted values
Vf	pycnometer volume (cm3)
$V_o$	Final volume (cm3)
$V_t$	Initial volume (cm3)
$\Delta E$	Total color change
$\Delta L^{\ast }$,$\Delta b^{\ast }$,$\Delta a^{\ast }$	Differences between the color of the fresh and dried sample
ρs	density of toluene (0.87 g/cm3 at 20 °C)
${\eta }_d$	Drying efficiency (%)
${\eta }_e$	Energy efficiency (%)
$S_a$	Shrinkage (cm3)