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A new analytical-empirical model for the instantaneous diffuse radiation and experimental investigation of its validity

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  • Nijegorodov, N.
  • Adedoyin, J.A.
  • Devan, K.R.S.

Abstract

Most of the diffuse fraction correlations are based on hourly or daily data. However, the performance of solar collectors depends on instantaneous solar radiation. Moreover, in most cases the diffuse fraction is defined as IdIg, or GdGg, where Ig and Gg are hourly, and daily global radiation. But in many cases it is more suitable to define the diffuse fraction as IdIbn or GdGbn, as was done in the ASHRAE model. At present there are some fairly accurate methods, e.g. the parameterization method, to predict direct beam radiation, Ibn. In combination with an accurate model for diffuse fraction defined as IdIbn, these methods would allow the prediction of instantaneous, hourly and daily beam, diffuse, ground reflected, and total solar radiation. The model developed in this paper allows the calculation of instantaneous diffuse radiation directly from the extraterrestrial radiation. According to this model, the instantaneous diffuse radiation and IdIbn fraction can be simulated with the help of the following formulae:

Suggested Citation

  • Nijegorodov, N. & Adedoyin, J.A. & Devan, K.R.S., 1997. "A new analytical-empirical model for the instantaneous diffuse radiation and experimental investigation of its validity," Renewable Energy, Elsevier, vol. 11(3), pages 341-350.
    • Handle: RePEc:eee:renene:v:11:y:1997:i:3:p:341-350
    DOI: 10.1016/S0960-1481(96)00133-4
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    References listed on IDEAS

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    1. Nijegorodov, N. & Devan, K.R.S. & Jain, P.K. & Carlsson, S., 1994. "Atmospheric transmittance models and an analytical method to predict the optimum slope of an absorber plate, variously oriented at any latitude," Renewable Energy, Elsevier, vol. 4(5), pages 529-543.
    2. Nijegorodov, N. & Luhanga, P.V.C., 1996. "Air mass: Analytical and empirical treatment; an improved formula for air mass," Renewable Energy, Elsevier, vol. 7(1), pages 57-65.
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    2. Zervas, P.L. & Sarimveis, H. & Palyvos, J.A. & Markatos, N.C.G., 2008. "Prediction of daily global solar irradiance on horizontal surfaces based on neural-network techniques," Renewable Energy, Elsevier, vol. 33(8), pages 1796-1803.
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    4. Nijegorodov, N. & Luhanga, P.V.C., 1998. "A new model to predict direct normal instantaneous solar radiation, based on laws of spectroscopy, kinetic theory and thermodynamics," Renewable Energy, Elsevier, vol. 13(4), pages 523-530.
    5. Antonanzas-Torres, F. & Urraca, R. & Polo, J. & Perpiñán-Lamigueiro, O. & Escobar, R., 2019. "Clear sky solar irradiance models: A review of seventy models," Renewable and Sustainable Energy Reviews, Elsevier, vol. 107(C), pages 374-387.
    6. Nijegorodov, N.I. & Devan, K.R.S. & Simao, H. & Mabbs, R., 2003. "Comprehensive study of solar conditions in Mozambique: the effect of trade winds on solar components," Renewable Energy, Elsevier, vol. 28(12), pages 1965-1983.

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