Glare Protection. (a) The Board shall ensure that measures are taken to prevent glare caused by direct or indirect light.
Glare Protection. The Radiance package within the program “Evalglare” (the new method for the Daylight Glare probability DGP is described in [14]) is used to evaluate the glare probability. Three different simulations are carried out by the author for different sun positions: ▪ Complete glazed façade with external venetian blind (Design-1). ▪ Complete glazed façade with the new angular selective façade (Design-2) ▪ 70% of the external façade is covered by the new system and the upper part is transparent with horizontal slat to redirect the light (Design-3). Two different working areas are considered, position one is placed on the desk to the right and position two on the desk on the left of the picture (see Table 4). The possible glare source areas are underlined with different colours. Table 4: Three different façades design are simulated. With the Evalglare tool it is possible to evaluate the area of the picture which could be glare source for the user sitting in Position 1 or Position 2. It is important to remember that the colour areas are not 100% glare sources they put in evidence the possible areas of glare. Design-1 Design-2 Design-3 While the design-1 reveals different glare sources due to the blind position (the slat angle of the blinds is considered fix at 35°) with a critical DGP value (more than 40%), the other two systems have a good glare protection. Especially for the design-2, with a DGP2=0,24, the probable glare source is located in the lower part of the façade (because of the reflection of the external ground) and does not disturb the users. Also the design-3 with a higher mean luminance than the design-2, has a DGP value acceptable (DGP3<0.3). The DGP analysis reveals the very good glare-protection performance of the new angular selective façade.
