Book - School of Science and Technology

80 The building in summerTable 3.4 Solar cooling loads for fast-response building with single clear glazing: SE England, unshadedSolar cooling load at stated sun time …W m 2 †DateOrientation0730 0830 0930 1030 1130 1230 1330 1430 1530 1630 1730Mar 29 N 38 50 64 74 83 86 86 81 72 60 47NE 160 181 135 83 97 98 98 93 84 72 58E 252 355 400 361 261 147 133 120 111 99 84SE 231 353 456 498 483 426 319 196 142 121 105S 109 176 283 384 457 505 497 454 377 270 161SW 104 118 135 162 224 347 443 501 514 467 358W 87 101 115 126 135 150 175 293 389 420 370NW 55 69 83 93 102 105 106 104 97 154 193Apr 28 N 70 87 95 103 110 115 116 110 103 93 86NE 322 308 236 143 146 143 143 137 131 120 106E 439 501 510 430 314 192 179 167 160 149 136SE 331 433 511 515 487 413 301 186 169 149 135S 115 157 255 346 418 457 455 409 339 236 142SW 133 149 162 184 212 330 437 503 535 505 434W 138 154 167 176 184 199 226 351 465 518 513NW 104 120 133 142 149 154 155 159 167 258 325May 29 N 118 121 126 131 137 140 139 135 130 123 120NE 382 362 290 190 174 166 165 161 155 146 134E 475 519 518 450 329 208 194 184 179 169 157SE 321 408 471 485 448 367 258 167 166 152 140S 110 129 201 289 355 388 384 345 274 182 116SW 142 156 168 183 193 290 393 465 497 477 420W 170 184 196 204 210 223 247 317 484 544 554NW 142 156 168 176 182 185 185 197 221 321 394Jun 21 N 144 139 142 147 151 154 154 151 147 144 143NE 440 413 320 211 190 180 181 178 173 165 154E 533 579 550 469 343 220 207 199 195 186 176SE 345 437 482 487 446 363 253 168 171 159 148S 111 123 191 276 342 376 374 331 261 174 116SW 147 159 170 182 190 282 389 460 492 476 424W 185 197 207 215 220 232 257 382 497 561 578NW 160 172 182 190 195 198 199 214 244 347 424to solar radiation, an addition of 10% to the listed figure, as mentioned previously, maybe justifiable.Structural shadingIn a deep plan building, it is possible that windows are provided more to encourageoccupants to retain visual contact with outside rather than in competition with somesubsidiary form of illumination. In consequence, the use of internal or external blinds maynot be acceptable, despite the penalty paid in heat gain. It is therefore necessary toconsider the extent to which vertical fins or horizontal projections may be of value. It isself-evident that, in the latitude of the British Isles, vertical fins are useful only on the east