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Title: Vertical bifacial solar farms: Physics, design, and global optimization

Abstract

There have been sustained interest in bifacial solar cell technology since 1980s, with prospects of 30–50% increase in the output power from a stand-alone panel. Moreover, a vertical bifacial panel reduces dust accumulation and provides two output peaks during the day, with the second peak aligned to the peak electricity demand. Recent commercialization and anticipated growth of bifacial panel market have encouraged a closer scrutiny of the integrated power-output and economic viability of bifacial solar farms, where mutual shading will erode some of the anticipated energy gain associated with an isolated, single panel. Towards that goal, in this paper we focus on geography-specific optimization of ground-mounted vertical bifacial solar farms for the entire world. For local irradiance, we combine the measured meteorological data with the clear-sky model. In addition, we consider the effects of direct, diffuse, and albedo light. We assume the panel is configured into sub-strings with bypass-diodes. Based on calculated light collection and panel output, we analyze the optimum farm design for maximum yearly output at any given location in the world. Lastly, our results predict that, regardless of the geographical location, a vertical bifacial farm will yield 10–20% more energy than a traditional monofacial farm for amore » practical row-spacing of 2 m (corresponding to 1.2 m high panels). With the prospect of additional 5–20% energy gain from reduced soiling and tilt optimization, bifacial solar farm do offer a viable technology option for large-scale solar energy generation.« less

Authors:
 [1];  [2];  [1];  [1]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. King Abdullah Univ. of Science and Technology (Saudi Arabia)
Publication Date:
Research Org.:
Stanford Univ., CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1579799
Alternate Identifier(s):
OSTI ID: 1549937
Grant/Contract Number:  
EE0004946; AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Applied Energy
Additional Journal Information:
Journal Volume: 206; Journal Issue: C; Journal ID: ISSN 0306-2619
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; Bifacial solar cell; Vertical panel; Solar farm; Global output

Citation Formats

Khan, M. Ryyan, Hanna, Amir, Sun, Xingshu, and Alam, Muhammad A. Vertical bifacial solar farms: Physics, design, and global optimization. United States: N. p., 2017. Web. doi:10.1016/j.apenergy.2017.08.042.
Khan, M. Ryyan, Hanna, Amir, Sun, Xingshu, & Alam, Muhammad A. Vertical bifacial solar farms: Physics, design, and global optimization. United States. doi:10.1016/j.apenergy.2017.08.042.
Khan, M. Ryyan, Hanna, Amir, Sun, Xingshu, and Alam, Muhammad A. Mon . "Vertical bifacial solar farms: Physics, design, and global optimization". United States. doi:10.1016/j.apenergy.2017.08.042. https://www.osti.gov/servlets/purl/1579799.
@article{osti_1579799,
title = {Vertical bifacial solar farms: Physics, design, and global optimization},
author = {Khan, M. Ryyan and Hanna, Amir and Sun, Xingshu and Alam, Muhammad A.},
abstractNote = {There have been sustained interest in bifacial solar cell technology since 1980s, with prospects of 30–50% increase in the output power from a stand-alone panel. Moreover, a vertical bifacial panel reduces dust accumulation and provides two output peaks during the day, with the second peak aligned to the peak electricity demand. Recent commercialization and anticipated growth of bifacial panel market have encouraged a closer scrutiny of the integrated power-output and economic viability of bifacial solar farms, where mutual shading will erode some of the anticipated energy gain associated with an isolated, single panel. Towards that goal, in this paper we focus on geography-specific optimization of ground-mounted vertical bifacial solar farms for the entire world. For local irradiance, we combine the measured meteorological data with the clear-sky model. In addition, we consider the effects of direct, diffuse, and albedo light. We assume the panel is configured into sub-strings with bypass-diodes. Based on calculated light collection and panel output, we analyze the optimum farm design for maximum yearly output at any given location in the world. Lastly, our results predict that, regardless of the geographical location, a vertical bifacial farm will yield 10–20% more energy than a traditional monofacial farm for a practical row-spacing of 2 m (corresponding to 1.2 m high panels). With the prospect of additional 5–20% energy gain from reduced soiling and tilt optimization, bifacial solar farm do offer a viable technology option for large-scale solar energy generation.},
doi = {10.1016/j.apenergy.2017.08.042},
journal = {Applied Energy},
number = C,
volume = 206,
place = {United States},
year = {2017},
month = {9}
}

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