High Performing Buildings - Spring 2008 - (Page 34) light enters early or late in the day during the summer. If baffles are needed, consider vertically suspended baffles, such as banners, that can intercept the light during these key times. South-Facing Lightshelves Lightshelves are typically the system of choice for multistory buildings because they can bounce sunlight deep into moderately sized rooms through high glazing areas on the south side of buildings. Typically, lightshelves cost less than monitors. The downside of this approach is that the light comes from one side of the room, making it harder to achieve uniform lighting. Also, contrast between the brighter glazed wall and the opposite side of the room must be addressed. When optimizing lightshelf design: • Recognize the limitations of side daylighting. In typical windows, light levels drop considerably moving away from low view windows. It is common for the light level to Baffles inside south-facing monitor. T H E R M A L G A I N S B Y W I N D O W O R I E N TAT I O N Btu/ft2 of unprotected glass/day at 35°N Latitude. Btu/ft2 of unprotected glass/day at 48°N Latitude. 34 HIGH PERFORMING BUILDINGS Spring 2008
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