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Experimental and theoretical investigation of global and diffuse solar radiation in the United Arab Emirates

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  • Khalil, A.
  • Alnajjar, A.

Abstract

In the present study, the global, direct and diffuse components of solar radiation as well as temperature, relative humidity and wind speed have been continuously monitored and analysed on an hourly, daily and monthly basis. The monthly average daily total solar radiation varies from 2700 W h/m2 in December to 8000 W h/m2 in June with an average clearness index of 0.65. Experimental data are compared to the predictions of different theoretical models as functions of declination and hour angles. Correlations are obtained describing the variation of hourly, daily and monthly averages of total and diffuse solar radiation using polynomial expressions. Empirical correlations describing the dependence of the daily average diffuse to total radiation ratio on the clearness index are also obtained. Data for the daily diffuse to total radiation ratio are compared to correlations obtained by other investigators. The comparison shows a reasonable agreement with some scatter due to the seasonal dependence of the correlation. Comparison of calculations with experimental measurements under clear sky conditions show excellent agreement with a maximum error of 8%.

Suggested Citation

  • Khalil, A. & Alnajjar, A., 1995. "Experimental and theoretical investigation of global and diffuse solar radiation in the United Arab Emirates," Renewable Energy, Elsevier, vol. 6(5), pages 537-543.
    • Handle: RePEc:eee:renene:v:6:y:1995:i:5:p:537-543
    DOI: 10.1016/0960-1481(95)00058-R
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    Cited by:

    1. Islam, M.D. & Alili, A.A. & Kubo, I. & Ohadi, M., 2010. "Measurement of solar-energy (direct beam radiation) in Abu Dhabi, UAE," Renewable Energy, Elsevier, vol. 35(2), pages 515-519.
    2. Jafarkazemi, Farzad & Saadabadi, S. Ali, 2013. "Optimum tilt angle and orientation of solar surfaces in Abu Dhabi, UAE," Renewable Energy, Elsevier, vol. 56(C), pages 44-49.
    3. Badescu, Viorel & Gueymard, Christian A. & Cheval, Sorin & Oprea, Cristian & Baciu, Madalina & Dumitrescu, Alexandru & Iacobescu, Flavius & Milos, Ioan & Rada, Costel, 2012. "Computing global and diffuse solar hourly irradiation on clear sky. Review and testing of 54 models," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(3), pages 1636-1656.
    4. Mokri, Alaeddine & Aal Ali, Mona & Emziane, Mahieddine, 2013. "Solar energy in the United Arab Emirates: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 28(C), pages 340-375.
    5. Bakirci, Kadir, 2015. "Models for the estimation of diffuse solar radiation for typical cities in Turkey," Energy, Elsevier, vol. 82(C), pages 827-838.
    6. Hafez, A.Z. & Soliman, A. & El-Metwally, K.A. & Ismail, I.M., 2017. "Tilt and azimuth angles in solar energy applications – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 77(C), pages 147-168.

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