Effect of tilt angle on soiling in perpendicular wind

Benjamin Figgis, Dirk Goossens, Bing Guo, Klemens Ilse

Research output: Contribution to journalArticle

Abstract

Use of horizontal single-axis trackers in PV power plants is becoming more common, especially with the introduction of bifacial modules. This raises the possibility of combating soiling by adjusting the tracker tilt angle to minimize dust deposition or maximize wind cleaning, at night or when cloudy. In this study we experimentally investigated soiling of coupons tilted about an axis perpendicular to wind, using both an environmental wind tunnel and desert field tests. CFD modeling was also performed to help interpret the experimental results. In the field it was found that maximum deposition (total particles impacting the coupon) occurred when coupons were tilted around 45° toward the wind. However maximum accumulation (particles remaining on the coupon) occurred at 22° tilt away from the wind. The difference was due to a high fraction of particles detaching from coupons when they are tilted toward the wind, which raises flow velocity and shear rate near the surface. The results suggest that to minimize soiling at night, 1-axis PV trackers could be stowed at maximum tilt toward the wind.

Original languageEnglish
Pages (from-to)294-301
Number of pages8
JournalSolar Energy
Volume194
DOIs
Publication statusPublished - Dec 2019

Fingerprint

Flow velocity
Shear deformation
Wind tunnels
Dust
Cleaning
Power plants
Computational fluid dynamics

Keywords

  • CFD
  • Deposition
  • Dust
  • Soiling
  • Tilt
  • Wind tunnel

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Effect of tilt angle on soiling in perpendicular wind. / Figgis, Benjamin; Goossens, Dirk; Guo, Bing; Ilse, Klemens.

In: Solar Energy, Vol. 194, 12.2019, p. 294-301.

Research output: Contribution to journalArticle

Figgis, Benjamin ; Goossens, Dirk ; Guo, Bing ; Ilse, Klemens. / Effect of tilt angle on soiling in perpendicular wind. In: Solar Energy. 2019 ; Vol. 194. pp. 294-301.
@article{4ae090890680454993779bbeb06194a6,
title = "Effect of tilt angle on soiling in perpendicular wind",
abstract = "Use of horizontal single-axis trackers in PV power plants is becoming more common, especially with the introduction of bifacial modules. This raises the possibility of combating soiling by adjusting the tracker tilt angle to minimize dust deposition or maximize wind cleaning, at night or when cloudy. In this study we experimentally investigated soiling of coupons tilted about an axis perpendicular to wind, using both an environmental wind tunnel and desert field tests. CFD modeling was also performed to help interpret the experimental results. In the field it was found that maximum deposition (total particles impacting the coupon) occurred when coupons were tilted around 45° toward the wind. However maximum accumulation (particles remaining on the coupon) occurred at 22° tilt away from the wind. The difference was due to a high fraction of particles detaching from coupons when they are tilted toward the wind, which raises flow velocity and shear rate near the surface. The results suggest that to minimize soiling at night, 1-axis PV trackers could be stowed at maximum tilt toward the wind.",
keywords = "CFD, Deposition, Dust, Soiling, Tilt, Wind tunnel",
author = "Benjamin Figgis and Dirk Goossens and Bing Guo and Klemens Ilse",
year = "2019",
month = "12",
doi = "10.1016/j.solener.2019.10.062",
language = "English",
volume = "194",
pages = "294--301",
journal = "Solar Energy",
issn = "0038-092X",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Effect of tilt angle on soiling in perpendicular wind

AU - Figgis, Benjamin

AU - Goossens, Dirk

AU - Guo, Bing

AU - Ilse, Klemens

PY - 2019/12

Y1 - 2019/12

N2 - Use of horizontal single-axis trackers in PV power plants is becoming more common, especially with the introduction of bifacial modules. This raises the possibility of combating soiling by adjusting the tracker tilt angle to minimize dust deposition or maximize wind cleaning, at night or when cloudy. In this study we experimentally investigated soiling of coupons tilted about an axis perpendicular to wind, using both an environmental wind tunnel and desert field tests. CFD modeling was also performed to help interpret the experimental results. In the field it was found that maximum deposition (total particles impacting the coupon) occurred when coupons were tilted around 45° toward the wind. However maximum accumulation (particles remaining on the coupon) occurred at 22° tilt away from the wind. The difference was due to a high fraction of particles detaching from coupons when they are tilted toward the wind, which raises flow velocity and shear rate near the surface. The results suggest that to minimize soiling at night, 1-axis PV trackers could be stowed at maximum tilt toward the wind.

AB - Use of horizontal single-axis trackers in PV power plants is becoming more common, especially with the introduction of bifacial modules. This raises the possibility of combating soiling by adjusting the tracker tilt angle to minimize dust deposition or maximize wind cleaning, at night or when cloudy. In this study we experimentally investigated soiling of coupons tilted about an axis perpendicular to wind, using both an environmental wind tunnel and desert field tests. CFD modeling was also performed to help interpret the experimental results. In the field it was found that maximum deposition (total particles impacting the coupon) occurred when coupons were tilted around 45° toward the wind. However maximum accumulation (particles remaining on the coupon) occurred at 22° tilt away from the wind. The difference was due to a high fraction of particles detaching from coupons when they are tilted toward the wind, which raises flow velocity and shear rate near the surface. The results suggest that to minimize soiling at night, 1-axis PV trackers could be stowed at maximum tilt toward the wind.

KW - CFD

KW - Deposition

KW - Dust

KW - Soiling

KW - Tilt

KW - Wind tunnel

UR - http://www.scopus.com/inward/record.url?scp=85074490346&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85074490346&partnerID=8YFLogxK

U2 - 10.1016/j.solener.2019.10.062

DO - 10.1016/j.solener.2019.10.062

M3 - Article

AN - SCOPUS:85074490346

VL - 194

SP - 294

EP - 301

JO - Solar Energy

JF - Solar Energy

SN - 0038-092X

ER -