Civil Engineering Reference
In-Depth Information
Fig. 5.7 The Oriel
®
PVIV-5A interface (IIT.-Milano). Image by the Author
voltage (Voc),
fill factor (ff), maximum output power (Pmax), cell ef
ciency, and
other standard photovoltaic cell parameters, Fig.
5.7
.
The measurements have been carried out in a completely dark environment with
the sample illuminated by a 300 W OSRAM ultra-vitalux lamp (UVA irradiated
power 315/400 nm 13.6 W, UVB irradiated power 280/315 nm 3.0 W).
5.2.3 Results, Analysis and Discussion
The results obtained through the
first test describe the expected behaviour of a
Konarka Power Plastic
®
120 solar cell laminated with a foil of ETFE 250
m thick
(Fig.
5.8
) (Mohamed Ibrahim
2013
). The testing setup has been designed in order to
reproduce the expected stress and strain conditions for a pneumatic modular panel
for fa
µ
le reproduces the expected load (estimated by means of
the structural analysis). The load has been applied through the manual control option
of the computer based software. The stress has been applied with a 1:1 load ratio and
increment equal to 0.2 kN/m every 180 s (360 s when it has been necessary to repeat
the ef
ç
ades and the load pro
ciency measurement) as described in Figs.
5.9
and
5.10
. The commercial solar
cells have been laminated with ETFE (pre-treated in order to increase the adhesion
properties) through a speci
c encapsulant and welded by means of impulse welding.
The ef
ciency of the solar cells have been measured at each increase in force,
recording the stress (LoadA and LoadB) and the strain in both directions on the
EFTE surface (strain A1) and the solar cell
'
s surface (Strain A2 and B2).
