TABLE OF CONTENTS - The Professional Green Building Council

Theme B: Creating a livable, healthy and environmentally viable citiesFigure 7: Example of a Central Intelligent Lighting Control Systemii. Proper zoningSince the office layout may not be finalised during design or installation stages,zoning into smaller sectors can provide greater flexibility and more potential forenergy saving as users can always switch off those zones not in use.iii. Motion/Photo sensorsAt the initial occupation stage, these sensors would always cause complaint fromend-users. Though users were supportive to the idea of automatic sensor control toreduce unnecessary use of energy, they were also annoyed by the frequent on-offor improper and untimely response of the sensor. The problem usually could besolved by adjusting the sensitivity and coverage angle of sensors. The POE teamalso found that the change of office layout could easily jeopardise the merit ofoccupancy sensors, and sensor control seems to fit the cellar office more easily.4.2.2 Air-conditioning(AC) systemIn general, AC systems consume about 50% of electricity of an office building.Therefore, POE team would also put more effort on the evaluating the performanceof the systems. The measurement and adjustment for air-conditioning wouldnormally take longer time due to the seasonal climate change and the occupancypercentage change. The data collection would usually rely on the installed CCMS.Other metering equipment would also be used to spot-check the accuracy of datacollected. Based on the collected data, AC loading and energy consumption wouldbe analysed by using proprietary computer program or self-developed computerprogram.534