High Performing Buildings - Spring 2008 - (Page 31) For Chattanooga Convention Center, south-facing roof monitors provide natural lighting into the 100,000 ft2 main exhibit area. The daylighting strategy and color selection reduced the load by 40 tons in just this one space. Site Maxim Maximization The most obvious site consideration obv is orientation. Elongating the building orientation on an east-west axis and locating high east-we priority spaces on the north and south space exposures can enhance cost-effective daylighting. Account for shading from adjacent buildings and trees and consider the reflectance of the materials in front of glazing areas. as well as the landscaping and architectural design. To fully integrate daylighting strategies, they cannot be regarded as alternative strategies. Roof Monitors and Lightshelves Roof monitors or side lighting with south-facing lightshelves or high, north transoms can reduce lighting and cooling loads. South-Facing Roof Monitors Roof monitors with vertical south glazing, interior baffles and properly sized overhangs can create uniform lighting having less contrast, provide daylight in spaces far from the perimeter of the building, provide passive heating benefits, and effectively diffuse and filter lighting. Unfortunately, roof monitors can only be used in singlestory designs or on the top floor of multistory designs. With south-facing roof monitors: • Integrated Design The most cost-effective, energyefficient daylighting strategies are integrated into the overall design and take into account all impacts, not just lighting. They consider the structural, mechanical and electrical systems, Use light-colored roofing material to reflect sunlight into the glazing. When placed in front and to the sides of the south-facing roof monitors, the glazing area in the monitors can be reduced by up to 30%, according to a study of my projects by North Carolina State University graduate students. The lightshelf reflects daylight deep into the space and shades the lower view window. The south-facing roof monitor with baffles blocks direct beams. Spring 2008 HIGH PERFORMING BUILDINGS 31
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