Empirical correlations as a means for estimating monthly average daily global radiation: A critical overview

In regions where solar energy is abundant, solar energy can play a vital role in attaining energy sustainability. Sizing solar energy systems requires the availability of solar radiation data on horizontal surface which can then be used to calculate solar radiation intensity on any tilted surface us...

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Bibliographic Details
Published in:Renewable energy Vol. 72; pp. 149 - 153
Main Authors: Halawa, Edward, GhaffarianHoseini, AmirHosein, Hin Wa Li, Danny
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 01.12.2014
Elsevier
Subjects:
Applied sciences
developing countries
Empirical correlation
Energy
Exact sciences and technology
meteorological data
Natural energy
relative humidity
Solar energy
Solar radiation
Solar radiation data
Sustainable development
Empirical correlation
Solar radiation data
Sustainable development
Solar energy
Global radiation
Renewable energy
Solar radiation
Monthly average
ISSN:0960-1481, 1879-0682
Online Access:Get full text
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Summary:In regions where solar energy is abundant, solar energy can play a vital role in attaining energy sustainability. Sizing solar energy systems requires the availability of solar radiation data on horizontal surface which can then be used to calculate solar radiation intensity on any tilted surface using appropriate conversion factors or formula. In many parts of the world, especially in developing countries, such data is not readily available. Many researchers have found that monthly average daily value of global solar radiation on horizontal surface can be estimated when meteorological parameters such as duration of sunshine, number of rainy days, relative humidity, etc. are available. Many empirical correlations have been developed based on this approach. The development of such a correlation has been made possible through the availability of solar and other meteorological data required for their validation. This paper presents a review on the existing empirical correlations and critically looks at the practicality of such correlations. This raises the question on the appropriateness of the past and present approaches adopted by researchers in this field. The paper also discusses various related aspects and proposes new directions for future research. •We critically overview the practicality of empirical solar global correlations.•We identify the predicaments of the research approach on this topic.•We highlight the strengths and weaknesses of the Sayigh universal formula.•We propose to focus on establishing global coefficients of the formula.
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ISSN:0960-1481
1879-0682
DOI:10.1016/j.renene.2014.07.004