Environmental Engineering Reference
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Measured
S
+
T
under Fixed Solar Irradiance and
Varying hermal Differences
450
Measured
S
+
T
(DT5)
Measured
400
S
+
T
(DT7)
Measured
S
+
T
(DT10)
350
Solar (380 lux)
hermal (DT5)
hermal (DT7)
hermal (DT10)
300
250
200
150
100
50
0
0
2
4
6
8
10
12
Voltage (V)
Measured
S
+
T
under Fixed Solar Irradiance and
Varying hermal Differences
450
Measured
(DT5)
Measured
S
+
T
(DT7)
Measured
S
+
T
400
S
T
+
(DT10)
350
Solar (380 lux)
hermal (DT5)
hermal (DT7)
hermal (DT10)
300
250
200
150
100
50
0
0
50
100
150
200
Load Resistance (kΩ)
FIGURE 5.24
P-V and P-R curves of an HEH system at fixed solar irradiance of 380 lux (3 W/m
2
) and different
thermal differences of 5 to 10 K.
to Measured S+T (
T10)] shown in
Figures 5.24
and
5.25
that the MPPs are
no longer fixed, but vary with the combined internal impedance of the solar
panel and the thermal energy harvester in parallel. This is the resulting effect
of the impedance mismatch between the two energy sources of the hybrid
energy harvester. Although there is an impedance mismatch issue in the pro-
posed HEH system, it is still possible to combine the two energy sources
together without dedicating each individual energy source with a power
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