## 3 Results and Discussion
### Performance Evaluation of Light Shelf Photovoltaic Configurations (LSPV) (Phase Four)  
Tables 7-9 present the WPI distribution and uniformity index for the reference model and the many LSPV configurations corresponding to CIE clear sky within the design days. During the summer  
Figure 8: The performance of various curved light shelves in distance of 1 m, 4 m and 7 m from the window and Uniformity. season, the WPI values and their averages concerning the reference model are higher than all LSPV configurations, especially during midday, as measured in the front area. It is also observed that in all cases, the uniformity index is higher than 0.5. Notably, the usage of LSPV leads to a noteworthy improvement in the WPI and uniformity index as compared to the reference model. The improvement in these parameters is better during midday, especially for configurations LSPV1 and LSPV2. In the case of the winter season, all WPI values are higher than 500 lux for all the configurations, except for the middle and back daylit area specific to the LSPV2 configuration. At the same time, the uniformity index improved for all the cases, but it was still less than 0.5. As for the mid-season results, the LSPV with a \(30^{\circ}\) tilted angle witnessed an increase in WPI at midday, while the LSPV with a horizontal angle witnessed an increase during the evening as a result of the low sun position. The only configuration that had uniformity was LSPV2, unlike the reference model. \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline
**Configurations** & **Solstice Summer** & **L1** & **L2** & **L3** & **L4** & **L5** & **L6** & **L7** & **Average** & **Uniformity** \\ \hline \multirow{3}{*}{**Reference Model**} & 9.00 a.m. & 441 & 432 & 363 & 292 & 236 & 196 & 177 & 305 & 0.58 \\  & 12.00 p.m. & 1016 & 972 & 795 & 628 & 501 & 415 & 376 & 672 & 0.56 \\  & 3.00 p.m. & 480 & 467 & 392 & 316 & 257 & 216 & 194 & 332 & 0.59 \\ \hline \multirow{3}{*}{**LSPV1**} & 9.00 a.m. & 352 & 333 & 278 & 229 & 190 & 162 & 148 & 242 & 0.61 \\  & 12.00 p.m. & 658 & 644 & 543 & 449 & 376 & 323 & 300 & 470 & 0.64 \\  & 3.00 p.m. & 427 & 408 & 351 & 299 & 259 & 230 & 215 & 313 & 0.69 \\ \hline \multirow{3}{*}{**LSPV2**} & 9.00 a.m. & 350 & 333 & 287 & 245 & 210 & 183 & 169 & 254 & 0.67 \\  & 12.00 p.m. & 577 & 558 & 478 & 401 & 336 & 289 & 267 & 415 & 0.64 \\  & 3.00 p.m. & 376 & 354 & 304 & 259 & 219 & 191 & 175 & 268 & 0.65 \\ \hline \multirow{3}{*}{**LSPV3**} & 9.00 a.m. & 380 & 362 & 303 & 248 & 205 & 175 & 159 & 262 & 0.61 \\  & 12.00 p.m. & 764 & 755 & 645 & 530 & 441 & 372 & 341 & 550 & 0.62 \\  & 3.00 p.m. & 426 & 404 & 399 & 278 & 230 & 197 & 180 & 302 & 0.60 \\ \hline \multirow{3}{*}{**LSPV4**} & 9.00 a.m. & 308 & 339 & 284 & 277 & 190 & 160 & 145 & 243 & 0.60 \\  & 12.00 p.m. & 700 & 686 & 587 & 485 & 401 & 340 & 308 & 501 & 0.61 \\  & 3.00 p.m. & 420 & 402 & 342 & 284 & 236 & 202 & 184 & 296 & 0.62 \\ \hline \multirow{3}{*}{**LSPV5**} & 9.00 a.m. & 472 & 454 & 385 & 320 & 265 & 226 & 205 & 332 & 0.62 \\  & 12.00 p.m. & 849 & 838 & 711 & 583 & 480 & 404 & 368 & 605 & 0.61 \\  & 3.00 p.m. & 562 & 537 & 460 & 385 & 323 & 279 & 254 & 400 & 0.64 \\ \hline \multirow{3}{*}{**LSPV6**} & 9.00 a.m. & 431 & 410 & 342 & 277 & 225 & 189 & 170 & 292 & 0.58 \\  & 12.00 p.m. & 898 & 889 & 748 & 604 & 489 & 406 & 365 & 628 & 0.58 \\  & 3.00 p.m. & 532 & 512 & 439 & 369 & 314 & 272 & 248 & 384 & 0.65 \\ \hline \multirow{3}{*}{**LSPV7**} & 9.00 a.m. & 502 & 481 & 405 & 337 & 268 & 225 & 203 & 346 & 0.59 \\  & 12.00 p.m. & 932 & 918 & 771 & 627 & 513 & 428 & 390 & 654 & 0.60 \\  & 3.00 p.m. & 565 & 546 & 466 & 385 & 321 & 276 & 260 & 403 & 0.65 \\ \hline \multirow{3}{*}{**LSPV8**} & 9.00 a.m. & 517 & 496 & 419 & 442 & 280 & 235 & 211 & 371 & 0.57 \\  & 12.00 p.m. & 898 & 889 & 748 & 604 & 448 & 406 & 365 & 623 & 0.59 \\ \cline{1-1}  & 3.00 p.m. & 507 & 488 & 406 & 323 & 260 & 216 & 191 & 342 & 0.56 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: The point in time illuminance of PV integration with light shelves and uniformity at solstice summer.