High Performing Buildings - Spring 2008 - (Page 40) G L A Z I N G F O R D I F F E R E N T A P P L I C AT I O N S Application Non-Daylighting View Windows View Windows View Windows View Windows South North East or West, Unshaded East or West, Shaded Clear Double (or Tinted), Low-e Clear Double, Low-e Tinted Double, Low-e Clear Double, Low-e Exposure Glazing Type Daylighting Apertures Glass Above Lightshelves South Clear Double Clear Double Clear Double Clear Double • shades or blinds. Using blinds results in decreased performance, increased first costs, and greater long-term maintenance expenses. Try designing the space so that areas that need to be dark, such as a projection screen, television monitor and computer monitor, are in a shaded area, while the majority of the space remains lit. Televisions can be located in a corner, not adjacent to a window, to avoid glare. High Glass Above View Windows North Roof Monitor Glass Blinds Between the Glass South or North South General Recommendations Minimize contrast between bright surfaces and dark surfaces. Avoid bright, visually exposed windows. Select light colors for interior finishes. The color of the ceiling, walls, floor, and furniture has a major impact on the effectiveness of a daylighting strategy. Finishes should be white or light colored with good reflectance. Color is not the only factor to consider. Account for fissures or holes within acoustical tiles that will absorb light. This chart does not apply to the coldest climates, which may require triple glazing. strategies used should bounce, redirect or filter the sunlight so that direct beam light does not enter. • Develop space and turning on the lights will never be broken. • • daylighting strategies to provide superior lighting for two-thirds of the daylit hours. Daylighting must be superior to electrical lighting the majority of the time the space is occupied. If not, the habit of walking into a Consider the need to darken individual spaces. The success of daylighting strategies is greatly influenced by how the occupants interact with the components of the strategy, especially blinds or shades. If periodic darkening of a space is not required, do not install A south-facing lightshelf with blinds between the glass can reflect problematic light to the ceiling and back into the space. Sloping the ceiling downward from the head of the window to the back of the room improves reflectance. 40 HIGH PERFORMING BUILDINGS Spring 2008
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