Environmental Engineering Reference
In-Depth Information
Breakdown of Power (mW) Harvested by Hybrid
Energy Harvesting System
140
Harvested solar power (mW)
Harvested wind power (mW)
120
100
80
60
40
20
0
2.3 m/s &
80 W/m
2
2.3 m/s &
300 W/m
2
2.3 m/s &
500 W/m
2
4.0 m/s &
80 W/m
2
4.0 m/s &
300 W/m
2
4.0 m/s &
500 W/m
2
6.3 m/s &
80 W/m
2
6.3 m/s &
300 W/m
2
6.3 m/s &
500 W/m
2
Measurement Test Points
FIGURE 5.11
Power harvested by the hybrid wind and solar energy harvesting system.
80 W/m
2
, the harvested power of 17 mW is still more than enough to sustain
the operation of the wireless sensor node.
5.2.4
Experimental Results
The proposed concept of a self-powered HEH wireless sensor node using an
efficient power management circuit, as illustrated in
Figure 5.12
, has been
implemented into a hardware prototype tested in the laboratory environ-
ment. A photograph of the developed HEH wireless sensor node is depicted
in
Figure 5.13
. Several tests were conducted during the experiments to vali-
date the performance of the optimized HEH system using a CV-based MPPT
scheme in sustaining the operation of the wireless sensor node.
5.2.4.1 Performance of the Hybrid Energy Harvesting (HEH) System
The experimental tests were conducted in accordance with the winter con-
dition of the deployment ground illustrated in Section 5.2.1 where the aver-
age wind speed and average solar irradiance level were given as 4 m/s and
80 W/m
2
,respectively. The HEH system is designed to sustain the wireless
sensor node to transmit the sensed data (i.e., temperature and wind speed)
every second. A 1.5-F, 5.5-V supercapacitor is used to store the harvested en-
ergy from the HEH system. Several experimental tests were conducted on
the hardware prototype of the HEH wireless sensor. The experimental results
shown in
Figure 5.14
are used to differentiate the performance of the WEH
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