# Explainable Post-Occupancy Evaluation Using a Humanoid Robot
## 4 Case Study
### Software Output Analysis  
The digital model of the office shown in Figure 5 was implemented in the software Dialux Evo. All the optical characteristics of the surfaces of the room were implemented in the model. Furthermore, a maintenance factor of 0.8 was set. To perform the daylight simulation, an hour of a day and the sky conditions ([[http://www.cie.co.at/publications/cie-standard-overcast-sky-and-clear-sky](http://www.cie.co.at/publications/cie-standard-overcast-sky-and-clear-sky)]([http://www.cie.co.at/publications/cie-standard-overcast-sky-and-clear-sky](http://www.cie.co.at/publications/cie-standard-overcast-sky-and-clear-sky))) were selected. Some simulations were performed at different hours of the day. A calculation surface was positioned at the height of 0.75 m from the floor (see Figure 6). This comprehends the whole area of the work-plane available for the user. The portion of the desk behind the first monitor (i.e., black semicircle on the right) was not considered due to its irregular form, which resulted in being uncomfortable for the user. Figure 7 shows the isolines of the illuminance values calculated by the simulation software. It is a 2D representation of the values shown in Figure 6. \begin{table}
\begin{tabular}{c c c c} \hline  & **Illuminance [lx]** & **Temperature [\({}^{\circ}\)C]** & **Relative Humidity [\%]** \\ \hline
**Min** & 52 & 22.95 & 40.89 \\
**Max** & 376 & 25 & 44.48 \\
**Mean** & 181.1 & 23.73 & 43.35 \\
**Dev.Stand** & 75.5 & 0.6 & 1.2 \\ \hline \end{tabular}
\end{table} 
Table 4: Table with the maximum and minimum values. Figure 4: Photograph of the office under study. Figure 5: The 3D model of the office under study. Figure 6: Calculation surface on the work-plane. Figure 7: Simulated illuminance values on the work-plane. As can be noticed, the obtained values decreased significantly from the points near the window towards those near the door (i.e., far from the window). This is more evident considering the 3D representation of the illuminance in Figure 8, where a variation in the **y** coordinate can be appreciated. This situation always occurs during the day since it is tied to the position of the window. Moreover, during the day, the illuminance values compliant with the technical standard EN12464 are only rarely achieved at some points. Some simulations were carried out considering only the natural lighting and the simulation considering both natural and artificial light. It is noted that artificial light did not improve the illuminance during the hour of the daylight. In the diagrams depicted in Figure 9, the simulated illuminance values are compared with some experimental values to assess the accuracy of the results. They show a variation throughout space and time. In particular, they refer to the values of the illuminance (simulated and real ones) of the office taken on 4 December 2019. Both simulations and the acquisition of the real data were performed with the artificial light off, the door closed, and the window drapes open. The first and the second data acquisition were performed at 11:00 a.m. and 12:30 a.m.when the sky was clear. Instead, during the third acquisition at 2:30 p.m., the sky was cloudy. The simulation was run by setting the same time when the measurements were taken and the same sky conditions. The three diagrams on the top refer to a fixed time and y coordinate of the work-plane, whereas the x coordinate ranges from 170 to 360 cm. Taking into account that the origin of the reference system corresponds to the corner on the bottom left, as shown in Figure 5, these values span the whole work-plane. Conversely, the three diagrams on the bottom of Figure 9 were retrieved by fixing a point on the work-plane, varying the time from 11:00 a.m. to 2:30 p.m.  
As concerns the comparison of the real and simulated values shown in the top diagrams, it can be noticed that a good agreement was maintained until the right edge of the work-plane. In this part, very low values were retrieved, making this part unsuitable throughout the hours of the day.