## 3 Results and Discussion
With increasing speed, there was a higher degree of air turbulence and mixing of individual layers, which reduced the vertical temperature gradient. It is also interesting to compare the speed of air flow at different height levels. In all cases, lower velocities were measured at the level of the head than at the level of the body's center of gravity. This can also be seen on the profiles of air flow speed in Figure 10. This phenomenon was discussed in more detail in a previous study, where it was also confirmed by CFD simulation and was created by a combination of the coanda effect, the flow around obstacles and the cumulation of velocity vectors [19]. The PMV and PPD indexes were expressed from the measurable parameters of the thermal-humidity microclimate and from the subjective parameters (thermal resistance of clothing and total metabolism). As indicated in Table 5 and in Figure 11, as the air outlet speed through the LAFC increases, the air flow speed in the residence zone also increases, and people's dissatisfaction with the indoor environment, i.e., the PPD index, increases. We can notice the connection between the increasing speed of the air flow and the increasing PPD index, especially by comparing the height level. For variant 3, at height level H1, the air flow speed is 0.05 m/s and the temperature is 23.5 \({}^{\circ}\)C. At altitude level H2, the temperature is 23.7 \({}^{\circ}\)C and the air flow speed is 0.20 m/s. Although the temperature is  
Figure 9: Air temperature profiles in the experimental laboratory for individual variants; (**a**) Variant 1; (**b**) Variant 2; (**c**) Variant 3; (**d**) Variant 4; (**e**) Variant 5.  
slightly higher at the H2 level, due to the higher air flow speed, there was an increase in user dissatisfaction with the environment (PPD index) due to the cold, from 18.45% to 34.35%. In the area of the legs (H1), there were no significant changes in air flow speed and PPD index between the first and fourth variants. According to the curve of a comfortable and acceptable environment from the point of view of thermal well-being, there is a significant disturbance of comfort from the outflow velocity of 0.2 m/s. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**PMV Index**} & \multicolumn{5}{c}{**Variant**} \\ \cline{2-6}  & **1** & **2** & **3** & **4** & **5** \\ \hline position H1 [-] & \(-\)0.62 & \(-\)0.90 & \(-\)0.80 & \(-\)0.81 & \(-\)1.25 \\ position H2 [-] & \(-\)0.70 & \(-\)0.91 & \(-\)1.18 & \(-\)1.25 & \(-\)1.86 \\ position H3 [-] & \(-\)0.53 & \(-\)0.62 & \(-\)1.16 & \(-\)1.10 & \(-\)1.71 \\ \hline \multicolumn{6}{c}{Variant} \\ \cline{2-6}  & 1 & 2 & 3 & 4 & 5 \\ \hline position H1 [\%] & 13.04 & 21.95 & 18.45 & 19.01 & 37.77 \\ position H2 [\%] & 15.26 & 22.47 & 34.35 & 37.50 & 70.20 \\ position H3 [\%] & 10.79 & 13.12 & 33.34 & 30.31 & 62.25 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: PMV and PPD indexes for individual variants. Figure 10: Velocity profiles of air flow in the experimental laboratory for individual variants; (**a**) Variant 1; (**b**) Variant 2; (**c**) Variant 3; (**d**) Variant 4; (**e**) Variant 5. The measurement of thermal-humidity microclimate parameters took place in laboratory conditions with stabilized air flow. The supplied air was only exterior, and the device was not in circulation mode. This resulted in a slight fluctuation of the air temperature in the interior. The desired temperature in the room was set at 24 \(\pm\) 2 \({}^{\circ}\)C. The outside air temperature was higher than 30 \({}^{\circ}\)C, which caused a thermal load on the OR, and at the same time raised the demands for cooling the air behind the recovery exchanger of the HVAC equipment. The temperature supplied through the LAFC must therefore be lower than the required 24 \({}^{\circ}\)C [5; 6; 7; 8; 40]. As mentioned in the description of the HVAC system, the primary source of heat and cold is the heat pump, which is directly connected to the evaporator, or the condenser in the ventilation unit.