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Estimation of direct illuminance on a horizontal surface for clear and intermediate skies

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  • Robledo, L
  • Soler, A

Abstract

In the present work two simple models have been obtained which may be used to estimate mean hourly direct illuminance for clear skies as a function of solar elevation. Also a simple model has been developed valid for all sky conditions when direct illuminance is available, that is, clear and intermediate skies, using solar elevation and brightness index as input parameters. The sky conditions are defined by the clearness index and the brightness index, both calculated from solar irradiances.

Suggested Citation

  • Robledo, L & Soler, A, 2000. "Estimation of direct illuminance on a horizontal surface for clear and intermediate skies," Renewable Energy, Elsevier, vol. 19(1), pages 55-60.
    • Handle: RePEc:eee:renene:v:19:y:2000:i:1:p:55-60
    DOI: 10.1016/S0960-1481(99)00015-4
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    References listed on IDEAS

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    1. Robledo, Luis & soler, Alfonso, 1998. "Modelling irradiance on inclined planes with an anisotropic model," Energy, Elsevier, vol. 23(3), pages 193-201.
    2. Robledo, Luis & Soler, Alfonso, 1997. "Modelling daylight on inclined surfaces for applications to daylight conscious architecture," Renewable Energy, Elsevier, vol. 11(2), pages 149-152.
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    Cited by:

    1. Soler, A & Gopinathan, K.K & Claros, S.T, 2001. "A study on zenith luminance on Madrid overcast skies," Renewable Energy, Elsevier, vol. 23(1), pages 49-55.
    2. Robledo, Luis & Soler, Alfonso, 2000. "Luminous efficacy of direct solar radiation for clear skies," Energy, Elsevier, vol. 25(8), pages 689-701.
    3. Janjai, S & Jantarach, T & Laksanaboonsong, J, 2003. "A model for calculating global illuminance from satellite data," Renewable Energy, Elsevier, vol. 28(15), pages 2355-2365.
    4. Soler, A & Gopinathan, K.K, 2001. "Analysis of zenith luminance data for all sky conditions," Renewable Energy, Elsevier, vol. 24(2), pages 185-196.

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