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An anisotropic shadow ring correction method for the horizontal diffuse irradiance measurements

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  • Vartiainen, Eero

Abstract

Diffuse irradiance is usually measured with a shadow ring which prevents beam radiation from entering the measuring instrument. The shadow ring also obscures part of the sky, and therefore, it is necessary to correct the measured diffuse irradiance. This correction is often assumed to be constant at a certain time of the year and at a certain latitude. However, the radiance distribution of the sky is not isotropic, and the anisotropy must be taken into account in the correction. In this paper, a new numerical method for calculating the shadow ring correction is presented. The correction factor is calculated directly from the radiance distribution of the sky. For Helsinki latitude (60°N), the yearly average isotropic correction factor is 1.10 and the additional anisotropic correction factor is about 1.05. Realistic sky models, e.g. Perez all-weather model, were used in the calculation.

Suggested Citation

  • Vartiainen, Eero, 1999. "An anisotropic shadow ring correction method for the horizontal diffuse irradiance measurements," Renewable Energy, Elsevier, vol. 17(3), pages 311-317.
    • Handle: RePEc:eee:renene:v:17:y:1999:i:3:p:311-317
    DOI: 10.1016/S0960-1481(98)00756-3
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    Cited by:

    1. Rodríguez-Muñoz, J.M. & Monetta, A. & Alonso-Suárez, R. & Bove, I. & Abal, G., 2021. "Correction methods for shadow-band diffuse irradiance measurements: assessing the impact of local adaptation," Renewable Energy, Elsevier, vol. 178(C), pages 830-844.
    2. Dal Pai, Alexandre & Escobedo, João Francisco & Dal Pai, Enzo & de Oliveira, Amauri Pereira & Soares, Jacyra Ramos & Codato, Georgia, 2016. "MEO shadowring method for measuring diffuse solar irradiance: Corrections based on sky cover," Renewable Energy, Elsevier, vol. 99(C), pages 754-763.
    3. Vartiainen, Eero, 2000. "A new approach to estimating the diffuse irradiance on inclined surfaces," Renewable Energy, Elsevier, vol. 20(1), pages 45-64.
    4. Haiying Cheng & Xuan Zhang & Ziqian Chen & Wenhong Sun & Kaiyan He & Hongfei Zheng & Yanxiu Tang, 2022. "Theoretical Investigations on Shadow Band Correction Factors for Diffuse Radiation under Isotropic Conditions without Approximation," Energies, MDPI, vol. 15(19), pages 1-25, September.
    5. Vartiainen, Eero, 2000. "A comparison of luminous efficacy models with illuminance and irradiance measurements," Renewable Energy, Elsevier, vol. 20(3), pages 265-277.

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