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Title: A Practical Irradiance Model for Bifacial PV Modules: Preprint

Abstract

A model, suitable for a row or multiple rows of photovoltaic (PV) modules, is presented for estimating the backside irradiance for bifacial PV modules. The model, which includes the effects of shading by the PV rows, is based on the use of configuration factors (CFs) to determine the fraction of a source of irradiance that is received by the backside of the PV module. Backside irradiances are modeled along the sloped height of the PV module, but assumed not to vary along the length of the PV row. The backside irradiances are corrected for angle-of-incidence losses and may be added to the front side irradiance to determine the total irradiance resource for the PV cell. Model results are compared with the measured backside irradiances for NREL and Sandia PV systems, and with results when using the RADIANCE ray tracing program.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
Solar Energy Technologies Office (EE-4S), USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1364146
Report Number(s):
NREL/CP-5J00-67847
DOE Contract Number:
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at 2017 IEEE 44th Photovoltaic Specialists Conference (PVSC), Washington, DC, 25-30 June 2017
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; bifacial PV module; solar irradiance; model

Citation Formats

Marion, Bill, MacAlpine, Sara, Deline, Chris, Asgharzadeh, Amir, Toor, Fatima, Riley, Daniel, Stein, Joshua, and Hansen, Clifford. A Practical Irradiance Model for Bifacial PV Modules: Preprint. United States: N. p., 2017. Web.
Marion, Bill, MacAlpine, Sara, Deline, Chris, Asgharzadeh, Amir, Toor, Fatima, Riley, Daniel, Stein, Joshua, & Hansen, Clifford. A Practical Irradiance Model for Bifacial PV Modules: Preprint. United States.
Marion, Bill, MacAlpine, Sara, Deline, Chris, Asgharzadeh, Amir, Toor, Fatima, Riley, Daniel, Stein, Joshua, and Hansen, Clifford. Thu . "A Practical Irradiance Model for Bifacial PV Modules: Preprint". United States. doi:. https://www.osti.gov/servlets/purl/1364146.
@article{osti_1364146,
title = {A Practical Irradiance Model for Bifacial PV Modules: Preprint},
author = {Marion, Bill and MacAlpine, Sara and Deline, Chris and Asgharzadeh, Amir and Toor, Fatima and Riley, Daniel and Stein, Joshua and Hansen, Clifford},
abstractNote = {A model, suitable for a row or multiple rows of photovoltaic (PV) modules, is presented for estimating the backside irradiance for bifacial PV modules. The model, which includes the effects of shading by the PV rows, is based on the use of configuration factors (CFs) to determine the fraction of a source of irradiance that is received by the backside of the PV module. Backside irradiances are modeled along the sloped height of the PV module, but assumed not to vary along the length of the PV row. The backside irradiances are corrected for angle-of-incidence losses and may be added to the front side irradiance to determine the total irradiance resource for the PV cell. Model results are compared with the measured backside irradiances for NREL and Sandia PV systems, and with results when using the RADIANCE ray tracing program.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jun 15 00:00:00 EDT 2017},
month = {Thu Jun 15 00:00:00 EDT 2017}
}

Conference:
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  • A model, suitable for a row or multiple rows of photovoltaic (PV) modules, is presented for estimating the backside irradiance for bifacial PV modules. The model, which includes the effects of shading by the PV rows, is based on the use of configuration factors to determine the fraction of a source of irradiance that is received by the backside of the PV module. Backside irradiances are modeled along the sloped height of the PV module, but assumed not to vary along the length of the PV row. The backside irradiances are corrected for angle-of-incidence losses and may be added tomore » the front side irradiance to determine the total irradiance resource for the PV cell. Model results are compared with the measured backside irradiances for NREL and Sandia PV systems, and with results when using ray tracing software.« less
  • We describe and compare two methods for modeling irradiance on the back surface of rack-mounted bifacial PV modules: view factor models and ray-tracing simulations. For each method we formulate one or more models and compare each model with irradiance measurements and short circuit current for a bifacial module mounted a fixed tilt rack with three other similarly sized modules. Our analysis illustrates the computational requirements of the different methods and provides insight into their practical applications. We find a level of consistency among the models which indicates that consistent models may be obtained by parameter calibrations.
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