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A study on zenith luminance on Madrid overcast skies

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  • Soler, A
  • Gopinathan, K.K
  • Claros, S.T

Abstract

The zenith luminance has been measured at Madrid for skies with a cloud cover of 7–8 oktas and experimental mean 15-min values of Lz have been obtained. Among the most accurate fits to the data, a 2nd degree polynomial for Lz against tan(α) is the most simple. When only data for a cloud cover of 8 oktas are used a similar fit is obtained, but for a smaller coefficient of correlation, due to the smaller amount of data.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:23:y:2001:i:1:p:49-55
    DOI: 10.1016/S0960-1481(00)00158-0
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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, 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.
    3. Soler, A. & Robledo, L., 2000. "Global luminous efficacies on vertical surfaces for all sky types," Renewable Energy, Elsevier, vol. 19(1), pages 61-64.
    4. Robledo, Luis & Soler, Alfonso, 2000. "Luminous efficacy of direct solar radiation for clear skies," Energy, Elsevier, vol. 25(8), pages 689-701.
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    1. De Rosa, A. & Ferraro, V. & Kaliakatsos, D. & Marinelli, V., 2010. "Calculating indoor natural illuminance in overcast sky conditions," Applied Energy, Elsevier, vol. 87(3), pages 806-813, March.

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