## 3 Results and Discussion
### Influence of Drying Temperature
If these changes are significant, then more complex models based on differential equations in partial derivatives are used [8; 13; 22; 23; 24; 25] and numerical modeling [26; 27]. To get an idea of the adequacy of model (28) from a physical point of view, it is necessary to compare it with experimental data. Comparison with the Experimental Data on Drying Ceramic Blocks for Construction, Known from the Literature  
We will use the results of an experimental study of drying ceramic blocks for construction, known from the literature [26]. In this case, the use of models for drying a capillary-porous material in a thin layer is acceptable due to the fact that the thickness of the walls of the blocks is rather small (0.63,..., 0.94 cm) [26; 27]. The initial moisture content of the material is \(\sim\)0.17 (d.b.) (Table 1 in [26]), which according to (7) corresponds to \(C_{water}^{(w,b)}=0.17/(1+0.17)\approx 0.15\). In the cited work [26], experimental data on the change in the moisture content of the same material over time are given in graphical form for a number of experiments in which the drying temperature was 50, 60, 70, 80, 90, and 100 \({}^{\circ}\)C. The simulation results obtained using relations (24)-(28a) are shown in Figures 7 and 8. \(\tau=140\)min (see Section 3.4). The consistency of the experimental and calculated data is illustrated in Figure 9.  
Due to the fact that the data presented in Figure 8 confirm the adequacy of the model and the reliability of the simulation results. The characteristic of the process rate can be the slope ratio of the tangent to the curves in Figures 7 and 8. If the drying temperature increases, then the rate of this process also increases, and the time to completion of the process decreases, which corresponds to the data known from the literature. Figure 7 and calculations by Equation (28a) show that when drying to a moisture content of 0.04 (w.b.) at a temperature of 50, 60,..., 100 \({}^{\circ}\)C, each successive temperature step (10 \({}^{\circ}\)C) corresponds to decreasing time intervals. This feature can be explained by the fact that the relative value of the temperature increment decreases with each step. In other words, an increase in temperature from 50 to 60 \({}^{\circ}\)C means an increase in temperature by 10/50 = 20%; from 60 to 70 \({}^{\circ}\)C--by 10/60 \(\approx\) 17%; from 90 to 100 \({}^{\circ}\)C--by 10/90 \(\approx\) 11%. These results do not contradict the experimental studies known from the literature [26], according to which the rate of change in the moisture content of the material is directly proportional to the drying temperature. Figure 8: Normalized moisture content (w.b. (**a**) and d.b. (**b**)) depending on the time and drying temperature 50, 60,..., 100 \({}^{\circ}\)C at the initial material moisture of 0.15 (w.b.). \[\Delta M_{\textit{water}}=\Delta\theta M_{\textit{water}}\phi \tag{24}\]0 Dependence of moisture content (w.b. (**a**) and d.b. (**b**)) on time and drying temperature 50, 60,..., 100 \({}^{\circ}\)C at the initial material moisture of 0.15 (w.b.). \[\Delta M_{\textit{water}}=\Delta\theta M_{\textit{water}}\phi \tag{24}\]1 Comparison of experimental and calculated values of normalized moisture content (w.b. and d.b.). Drying temperature: 50 and 100 \({}^{\circ}\)C. Initial material moisture: 0.15 (w.b.). \(\approx\) 0.17 (d.b.). The experimental data were obtained after processing the plots according to Figure 8 in paper [26].