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

A. Madhlopa, C. Johnstone

Research output: Contribution to journalArticle

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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.
Original languageEnglish
Pages (from-to)873-882
Number of pages9
JournalSolar Energy
Issue number6
Publication statusPublished - Jun 2009


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

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