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The knowledge of the device light shelf under different conditions allows better use for the proper distribution of natural light inside the rooms. The objective of this investigation was to simulate a hypothetical office building with the curvilinear lightshelves and compared to flat lightshelves, under conditions of external obstruction by nearest buildings. These external elements block the visible portion of the celestial vault, which interferes with the amount of light admitted into the room, located in Vitória ES. The analysis of the illuminance levels was investigated in three different floors of the building, encompassing unequal situations of obstruction. The aim was to investigate the performance of the shelves in situations close to the reality of a vertical urban environment, analyzing the amount of light admitted by the vertical openings of the building and levels of internal uniformity for the four major orientations. The analysis of the admission of light was based on ranges of floor illuminance (Useful daylight illuminance UDI) and internal uniformity. Computer simulations through Daysim software, which calculates the illuminance values based on Ray-tracing method, considering the typical local climate was used. In conclusion it is noted that the shelves curves compared to the flat have greater ability to redirect the light to the back of the room, especially in periods when the solar altitude angle is greater. All simulated models showed a high percentage of annual hours with useful illuminance.

Desempenho de diferentes prateleiras de luz em edifício com entorno construído