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      Vertical bifacial PV systems: irradiance modeling and performance analysis of a lightweight system for flat roofs

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          Abstract

          Vertical bifacial photovoltaic (PV) systems are gaining interest as they can enable deployment of PV in locations with grid or area limitations. Over Easy Solar has developed a lightweight design for vertical bifacial systems for flat roofs employing small modules with the height of one cell. To model the expected output of these type of systems can, however, be challenging, as it is uncertain if conventional models will give accurate results for vertical bifacial PV. The irradiance conditions are different, and there can be other loss or gain mechanisms that are prominent in these types of systems compared to more conventional PV systems. In this study we assess the use of regular transposition modeling for plane of array irradiance modeling for vertical bifacial PV, and we evaluate the performance of Over Easy Solar pilot installations in Norway to identify prominent loss mechanisms. The results are relevant for most vertical bifacial systems. With regular transposition modeling plane of array irradiance is overestimated by less than 1%, but we find that accuracy of albedo input and choice of sky diffuse model impact modeling accuracy. Irradiance losses such as shading are not considered in the modeling. We calculate a median heat transfer coefficient of 55 W/m 2K, indicating high heat transfer and low thermal losses. High annual plane-of-array insolation, module bifaciality, interrow shading, reflection losses caused by high angle of incidence of the direct irradiance, and snow also have significant impact on the overall performance.

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          Most cited references15

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          Modeling daylight availability and irradiance components from direct and global irradiance

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            Improvement and validation of a model for photovoltaic array performance

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              Estimation of the diffuse radiation fraction for hourly, daily and monthly-average global radiation

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                Author and article information

                Journal
                epjpv
                https://www.epj-pv.org
                EPJ Photovoltaics
                EPJ Photovolt.
                EDP Sciences
                2105-0716
                11 April 2024
                11 April 2024
                2024
                : 15
                : ( publisher-idID: epjpv/2024/01 )
                : 13
                Affiliations
                [1 ] Department of Solar Power Systems, Institute for Energy Technology, , Kjeller, Norway,
                [2 ] Over Easy Solar, , Oslo, Norway,
                Author notes
                Article
                pv230067
                10.1051/epjpv/2024012
                fed10629-1dcc-480a-b740-71a7693ae19d
                © M.B. Øgaard et al., Published by EDP Sciences, 2024

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 30 September 2023
                : 5 February 2024
                Page count
                Figures: 10, Tables: 1, Equations: 3, References: 21, Pages: 10
                Funding
                Funded by: Norges Forskningsråd http://dx.doi.org/10.13039/501100005416
                Categories
                Special Issue on ‘EU PVSEC 2023: State of the Art and Developments in Photovoltaics’, edited by Robert Kenny and João Serra
                Original Article
                Custom metadata
                EPJ Photovoltaics 15, 13 (2024)
                yes
                2024
                2024
                2024

                Sustainable & Green chemistry,Materials technology,Semiconductors,Materials for energy,Technical & Applied physics,Renewable energy
                Vertical bifacial PV,Nordic conditions,bifacial irradiance modeling,performance analysis

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