PV Modules: Bifacial technology
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Introduction
Bifacial Ratio (BR) - Irradiation at the backside
•
Gback
Bifacial Ratio
Gfront
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Albedo is the diffuse radiation reflected by the soil out of the total solar radiation. Normally goes from 10% to 40%. Higher albedo
means higher BR. It strongly impacts the bifacial ratio with nearly linear behavior.
•
Row-to-Row spacing (aka pitch) is the distance between rows. BR increases when this distance increase. It is related with GCR
(Ground Coverage Ratio).
.
Clearance height is the distance between the bottom of the modules and the ground. Higher clearance means higher BR.
•
Tilt of the modules also affects the BR value.
Albedo
Row-to-row
spacing
Clearance
Tilt
Material
Asphalt
Light soil
Concrete
Beige built-up roofing
White EPDM roofing
Reflectance*(R)
Grear at
1000Wm-2 front
0.1
70 Wm-2
0.21
130 Wm-2
0.28
170 Wm-²
0.43
250 Wm-²
0.8
430 Wm-²
Deline et al., IEEE PVSC 2016; Deline et al., IEEE JPV (submitted)
(National Renewable Energy Laboratory)
GOPV Project | 1st TRAINING COURSES
TECHNICAL FOCUS ON FUTURE SOLAR PV SYSTEMS
October 26-29th 2020View entire presentation