Page 33 - Zero Net Energy Case Study Buildings-Volume 1

PACKARD FOUNDATION HEADQUARTERS BUILDING
for the work tasks and uses two types of light fixtures to produce the minimal comfortable light levels needed for each, resulting in a reduction in the amount of energy needed to light the entire space.
Lights are dimmed in response to daylight sensors and switched on in response to infra-red oc- cupancy detectors. In the private offices, there is a combined infra-red detector and an ultrasonic detector to control on/off. By combining the two, false detections by the highly sensitive ultra- sonic device, capable of detecting slight keyboard activity, are avoided since the infra-red must confirm the presence of an occupant.
Because the technology was not advanced enough at the time that this building was designed, LED light fixtures were not specified. (Recent improvements in the technology would likely have led to a different specification for both linear pendant fixtures and downlights.)
CASE STUDY NO. 1
Zero Net Energy Case Study Buildings: Volume 1
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PHOTO: JEREMY BITTERMANN