High Performing Buildings - Fall 2008 - (Page 48)

solar reflectance index). The resulting U-value is 0.063 Btu/h·ft2·°F. Harnessing Sunlight Despite the hot and humid climate, the 16,000 ft2, five-floor office building provides daylight at a 250 – 350 lux level throughout the day without gaining heat from the sun. More than 75% of the building’s interior is daylit, and 90% of occupants enjoy outside views. The building site and most parts of northern India receive more than 300 days of bright sunshine annually. On most working days, the sun provides sufficient light so that electric lighting is switched off during operation hours. A large atrium extends over all floors of the building. A south- inclined (15 degrees to horizontal) skylight encompasses the entire atrium. Because the sun moves southward for the majority of the day, the skylight, also called the light catcher, plays an important role in daylight harnessing. To minimize heat from direct sunlight, the light catcher has permanently inclined louvers of dull aluminum metal. By blocking direct sunlight throughout the day, the louvers reduce airconditioning loads and glare on workstation computers. The louvers’ angle was computer simulated to study year-round performance. Night Lighting In the evening, an advanced lighting management system automati- Recessed windows with fins cut down on direct solar heat gain. HPB.hotims.com/21087-15 48 HigH Performing Buildings fa l l 2 0 0 8 http://www.renewaire.com http://www.renewaire.com http://HPB.hotims.com/21087-15

Table of Contents for the Digital Edition of High Performing Buildings - Fall 2008

High Performing Buildings - Fall 2008
Contents
Lessons Learned
Green on a Budget
ASHRAE Sets Example: ASHRAE Headquarters
The Lavin-Bernick Center for University Life
Spectral Services Consultants Corporate Office
Advertising Index

High Performing Buildings - Fall 2008