An Analysis and Simulation of Curtain Wall Reflection Glare

This paper presents a computer-aided visualization on the influence of reflected sunbeams from curtain wall buildings. A survey was made to local buildings and it was discovered that reflected glare is a significant urban problem. Based on survey findings, a simulation was conducted to compare with actual occurrences in order to increase the comprehension of the consequences of window orientation and angles in the design stage. The simulation enabled design evaluation with an inspection above normal eye level and in a broader area, than that which normally could be achieved in a site survey at a pedestrian's or a driver's level. The computer simulation verified the influence of reflection on the urban environment by using a time-based record. In order to provide design solutions, the simulation used a 10x10x10 cube in referencing the horizontal area that would receive reflections. Due to the symmetric shape of the cube, a butterfly shaped boundary of reflection area (BRA) was concluded. BRA is smaller on the summer solstice than on the spring or autumnal equinox. In order to reduce BRA, a passive design approach was applied by tilting or rotating walls to evaluate how the tilted angles or orientation of the façade could affect reflected glare