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A numerical method to estimate time-varying values of diffuse irradiance on surfaces in complex geometrical environments

Author

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  • Tsangrassoulis, A.
  • Niachou, K.
  • Papakostantinou, N.
  • Pavlou, C.
  • Santamouris, M.

Abstract

The estimation of diffuse irradiance that impinges on a window or photovoltaic panel is of major importance for the determination of their performance. The present paper introduces the concept of angular shading factors (ASF) for the calculation of time-varying diffuse irradiances to be performed without the need to repeat time consuming intereflection calculations at every time step. For the calculation of ASF, a Monte Carlo backward ray tracing technique was used. As a result, geometrically complex scenes consisting of surfaces with diffuse and specular reflectances, while transparent and translucent surfaces can be modeled as well. After that, the calculation of diffuse irradiance can be performed in a dynamic way, by taking into consideration the sky radiance distribution variability.

Suggested Citation

  • Tsangrassoulis, A. & Niachou, K. & Papakostantinou, N. & Pavlou, C. & Santamouris, M., 2002. "A numerical method to estimate time-varying values of diffuse irradiance on surfaces in complex geometrical environments," Renewable Energy, Elsevier, vol. 27(3), pages 427-439.
    • Handle: RePEc:eee:renene:v:27:y:2002:i:3:p:427-439
    DOI: 10.1016/S0960-1481(01)00152-5
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    Cited by:

    1. Jebaraj, S. & Iniyan, S., 2006. "A review of energy models," Renewable and Sustainable Energy Reviews, Elsevier, vol. 10(4), pages 281-311, August.
    2. Tsangrassoulis, A. & Bourdakis, V. & Geros, V. & Santamouris, M., 2006. "A genetic algorithm solution to the design of slat-type shading system," Renewable Energy, Elsevier, vol. 31(14), pages 2321-2328.
    3. Ramírez-Faz, J. & López-Luque, R. & Casares, F.J., 2015. "Development of synthetic hemispheric projections suitable for assessing the sky view factor on vertical planes," Renewable Energy, Elsevier, vol. 74(C), pages 279-286.

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