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Study of hourly solar radiation data in Istanbul

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  • Topçu, S.
  • Dİlmaç, S.
  • Aslan, Z.

Abstract

This paper presents a study of the solar radiation data measured in Istanbul (41.1°N, 29.0°E) during 1992 and 1993. The monthly and annual average values of total solar radiation and clearness index are analysed. The monthly averages of daily total radiation are 1.23 kW h m−2 day−1 for January and 6.55 kW h m−2 day−1 for July. The annual average value of daily total radiation is 3.81 kW h m−2 day−1. The monthly averages of clearness index for January and July are 0.28 and 0.50, respectively. The annual average value of clearness index is 0.38. In the second part of the study, the seasonal relative frequency of hourly total radiation and clearness index is studied. 46% of the annual data corresponds to a value greater than 300 W m−2. The annual average frequency of clear hours is 24%. The analysis points to the conclusion that solar radiation will be efficient and useful between April and September for heating purposes. A polynomial relationship is developed between hourly clearness index and hourly fractional sunshine duration. Some statistical tests are used to check this relationship for four different ranges of optical air mass.

Suggested Citation

  • Topçu, S. & Dİlmaç, S. & Aslan, Z., 1995. "Study of hourly solar radiation data in Istanbul," Renewable Energy, Elsevier, vol. 6(2), pages 171-174.
    • Handle: RePEc:eee:renene:v:6:y:1995:i:2:p:171-174
    DOI: 10.1016/0960-1481(94)00057-D
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    Cited by:

    1. Khatib, Tamer & Mohamed, Azah & Sopian, K., 2012. "A review of solar energy modeling techniques," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(5), pages 2864-2869.
    2. Khalil, Samy A. & Shaffie, A.M., 2016. "Evaluation of transposition models of solar irradiance over Egypt," Renewable and Sustainable Energy Reviews, Elsevier, vol. 66(C), pages 105-119.
    3. Elagib, N.a. & Alvi, S.H. & Mansell, M.G., 1999. "Correlationships between clearness index and relative sunshine duration for Sudan," Renewable Energy, Elsevier, vol. 17(4), pages 473-498.
    4. Karapantsios, T.D & Hatzimoisiadis, K.A & Balouktsis, A.I, 1999. "Estimation of total atmospheric pollution using global radiation data: introduction of a novel clear day selection methodology," Renewable Energy, Elsevier, vol. 17(2), pages 169-181.
    5. Khalil, Samy A. & Shaffie, A.M., 2013. "A comparative study of total, direct and diffuse solar irradiance by using different models on horizontal and inclined surfaces for Cairo, Egypt," Renewable and Sustainable Energy Reviews, Elsevier, vol. 27(C), pages 853-863.

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