Wireless Sensor and Actuator Networks for Lighting Energy ...

Figure 9-8 Beacon message structure.........................................................................153
Figure 9-9 Sensor message structure..........................................................................154
Figure 9-10 Sensor management message structure. ..................................................155
Figure 9-11 User interface on the Kiosk [107]...........................................................156
Figure 9-12 Lighting preset setting interface [107]. ...................................................157
Figure 9-13 Average hourly percent utilization of the lighting system [107]..............159
Figure 9-14 Average hourly power consumption [107]..............................................159
Figure 9-15 Daylight simulating structure. ................................................................163
Figure 9-16 Daylight harvesting test on four occupants. ............................................165
Figure 9-17 Simulated daylight output for the first case.............................................165
Figure 9-18 Sensor readings in the first case..............................................................167
Figure 9-19 Percentage of energy consumption in the first case.................................168
Figure 9-20 Daylight harvesting test on seven occupants...........................................169
Figure 9-21 Simulated daylight output for the second case. .......................................169
Figure 9-22 Sensor readings in the second case (1)....................................................171
Figure 9-23 Sensor readings in the second case (2)....................................................172
Figure 9-24 Percentage of energy consumption in the second case. ...........................172
Figure 9-25 Measured daylight fluctuation. ...............................................................173
Figure 9-26 Light output from the daylight simulating structure. ...............................174
Figure 9-27 Sensor readings in the third scenario (1).................................................175
Figure 9-28 Sensor readings in the third scenario (2).................................................176
Figure 9-29 Percentage of energy consumption in the third scenario..........................177
Figure 9-30 Energy savings vs. payback period with current system cost...................183
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