Review of solar irradiance and daylight illuminance modeling and sky classification

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

12 Scopus Citations
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Original languageEnglish
Pages (from-to)445-453
Journal / PublicationRenewable Energy
Online published27 Mar 2018
Publication statusPublished - Oct 2018


In many parts of the world, the solar radiation and daylight illuminance data taken from surfaces of interest are not always readily available. Without direct measurement, the data can be predicted from empirical models based on geographical variations and meteorological parameters. Recently, the International Commission on Illumination (CIE) has adopted a list of 15 standard skies. Each standard sky represents a unique, well-defined sky radiance and luminance pattern expressed by mathematical equations that can use to compute solar irradiance and daylight illuminance on inclined surfaces and variously oriented vertical planes. An issue is whether the sky conditions can be correctly categorized. This paper reviews the solar radiation and daylight illuminance model developments and sky classification methods. The findings indicated that Machine Learning techniques have been effectively used for predicting solar radiation and daylight illuminance and classifying the standard skies. Such approaches could be globally adopted and useful to compute the required climatic data for renewable and sustainable developments and energy-efficient building designs.

Research Area(s)

  • Daylight illuminance, Machine learning techniques, Sky classification, Solar radiation, Typical weather databases