## 3 Results and Discussion  
### Influence of Initial Material Moisture Content (Wet Basis and Dry Basis)  
Using the above relations (18), (18a), (20), and (21), we perform model calculations, the results of which illustrate the effect of the initial moisture content on the drying process. The simulation results are shown in Figure 2.  
The following initial data were used in the calculations: initial moisture \(C_{water,start}^{(w.b.)}=0.025\),..., 0.275 (Figure 2a); equivalent initial moisture content \(C_{water,start}^{(d.b.)}=0.026\),..., 0.379, calculated by the Equation (8) (Figure 2b); parameter \(\tau=300\) min (11) in all variants. Calculations are performed according to Equations (18a) (Figure 2a) and (21) (Figure 2b).  
The normalized moisture content (Figure 3), depending on the basis (w.b. or d.b.), is defined as the ratio \(C_{water}^{(w.b.)}/C_{water,start}^{(w.b.)}\) or \(C_{water}^{(d.b.)}/C_{water,start}^{(d.b.)}\), respectively.  
Figure 2: Change in moisture content (w.b. (**a**) and d.b. (**b**)) depending on time at the initial moisture content \(C_{water,start}^{(w.b.)}=0.025\), \(0.05\),..., \(0.15\),..., \(0.275\).  
Figure 2 shows that if the initial moisture content is low enough (no more than 0.1), then the predicted moisture content is almost independent of the choice of the basis (w.b. or d.b.). However, with an increase in the initial moisture content, the influence of the choice of the basis also increases.  
Figure 3b and Equation (22) show that the normalized initial moisture content (d.b.) in this model does not depend on the initial moisture content, in other words, the model may not be informative enough. At the same time, the normalized initial moisture content (w.b.) determined using Equation (18) reflects the influence of the initial moisture content:  
\[\frac{C_{\text{under}}^{(w.b.)}}{C_{\text{under},start}^{(w.b.)}}=\frac{1}{C_{ \text{water},start}^{(w.b.)}(1-e^{\theta})+e^{\theta}} \tag{22a}\]  
Continuing the discussion, it is important to pay attention to Figure 1, from which it follows that the influence of the basis (w.b. or d.b.) will increase with increasing initial moisture content. This circumstance, as noted above, is not taken into account in the right-hand side of Equation (22), in contrast to Equation (22a). Therefore, the use of normalized moisture content (w.b.) (22a) may be more appropriate when simulating the drying of materials with high initial moisture content. To check this assumption, we perform calculations at a sufficiently high initial moisture content of the material (0.70, 0.725,..., 0.95 (w.b.), which is equivalent to the initial moisture interval (2.33,..., 19.00 (d.b.)). The simulation results are shown in Figures 4 and 5. Calculations were performed using formulas (18a) (Figure 4a), (21) (Figure 4b), (22a) (Figure 5a), and (22) (Figure 5b).  
Figure 4: Change in moisture content (w.b. (**a**) and d.b. (**b**)) depending on time at the initial moisture content 0.70, 0.725,..., 0.825,..., 0.95 (w.b.).  
Figure 3: Normalized moisture content (w.b. (**a**) and d.b. (**b**)) depending on time at the initial moisture content by Figure 2. Ratio \(C_{\text{under}}^{(d.b.)}/C_{\text{under},start}^{(d.b.)}\) is indifferent to initial moisture.  
Analysis of other features of the curves in Figures 4 and 5 is performed in Section 3.2.