Model for computation of solar fraction in a single-slope solar still

A. Madhlopa, C. Johnstone

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A new model that calculates the distribution of solar radiation inside a single-slope solar still has been proposed. In this model, the solar fraction on a vertical surface is divided into beam and diffuse parts and the optical view factors of surfaces inside the still are taken into account. To validate the model, outdoor tests of a conventional solar still were conducted under different weather conditions at the University of Strathclyde. The proposed model is compared with the previous one. It is found that the beam solar fraction is affected by both the geometry of the solar still and position of the sun in the sky. In contrast, the diffuse solar fraction is only dependent on the geometry of the solar distiller. The present model exhibited a lower root mean square error than that of the previous model. It appears that splitting the solar fraction into beam and diffuse parts improves the accuracy of modelling the performance of a single-slope solar still.
LanguageEnglish
Pages873-882
Number of pages9
JournalSolar Energy
Volume83
Issue number6
DOIs
Publication statusPublished - Jun 2009

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Geometry
Solar radiation
Mean square error
Sun

Keywords

  • back wall
  • beam solar fraction
  • diffuse solar fraction
  • effective irradiance
  • view factor

Cite this

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title = "Model for computation of solar fraction in a single-slope solar still",
abstract = "A new model that calculates the distribution of solar radiation inside a single-slope solar still has been proposed. In this model, the solar fraction on a vertical surface is divided into beam and diffuse parts and the optical view factors of surfaces inside the still are taken into account. To validate the model, outdoor tests of a conventional solar still were conducted under different weather conditions at the University of Strathclyde. The proposed model is compared with the previous one. It is found that the beam solar fraction is affected by both the geometry of the solar still and position of the sun in the sky. In contrast, the diffuse solar fraction is only dependent on the geometry of the solar distiller. The present model exhibited a lower root mean square error than that of the previous model. It appears that splitting the solar fraction into beam and diffuse parts improves the accuracy of modelling the performance of a single-slope solar still.",
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Model for computation of solar fraction in a single-slope solar still. / Madhlopa, A.; Johnstone, C.

In: Solar Energy, Vol. 83, No. 6, 06.2009, p. 873-882.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Model for computation of solar fraction in a single-slope solar still

AU - Madhlopa, A.

AU - Johnstone, C.

PY - 2009/6

Y1 - 2009/6

N2 - A new model that calculates the distribution of solar radiation inside a single-slope solar still has been proposed. In this model, the solar fraction on a vertical surface is divided into beam and diffuse parts and the optical view factors of surfaces inside the still are taken into account. To validate the model, outdoor tests of a conventional solar still were conducted under different weather conditions at the University of Strathclyde. The proposed model is compared with the previous one. It is found that the beam solar fraction is affected by both the geometry of the solar still and position of the sun in the sky. In contrast, the diffuse solar fraction is only dependent on the geometry of the solar distiller. The present model exhibited a lower root mean square error than that of the previous model. It appears that splitting the solar fraction into beam and diffuse parts improves the accuracy of modelling the performance of a single-slope solar still.

AB - A new model that calculates the distribution of solar radiation inside a single-slope solar still has been proposed. In this model, the solar fraction on a vertical surface is divided into beam and diffuse parts and the optical view factors of surfaces inside the still are taken into account. To validate the model, outdoor tests of a conventional solar still were conducted under different weather conditions at the University of Strathclyde. The proposed model is compared with the previous one. It is found that the beam solar fraction is affected by both the geometry of the solar still and position of the sun in the sky. In contrast, the diffuse solar fraction is only dependent on the geometry of the solar distiller. The present model exhibited a lower root mean square error than that of the previous model. It appears that splitting the solar fraction into beam and diffuse parts improves the accuracy of modelling the performance of a single-slope solar still.

KW - back wall

KW - beam solar fraction

KW - diffuse solar fraction

KW - effective irradiance

KW - view factor

UR - http://www.sciencedirect.com/science/journal/0038092X

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DO - 10.1016/j.solener.2008.12.002

M3 - Article

VL - 83

SP - 873

EP - 882

JO - Solar Energy

T2 - Solar Energy

JF - Solar Energy

SN - 0038-092X

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ER -