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[feature] Add sky models with CIE General sky as default

    • Open Issue created by Lebeau Frédéric @F.Lebeau

    Summary

    Add state of the art sky models to include realistic physically based light distribution in the sky hemisphere according to current standards

    Current behavior

    Only isotropic sky assumption (uniform sky, standard sky type 5 according to the Darula & Kittler refenrence listed in Sources below) for the diffuse component of light is available.

    Desired behavior

    Add to uniform sky an options for luminance distribution under CIE Overcast Sky, CIE Clear Sky. These extreme sky types are important for window design these do not represent fully conditions occurring in reality needed for energy simulations. Add the 15 standard sky relative luminance/radiance distributions proposed by DARULA, S. – KITTLER, R. CIE, 2002.

    • Configure the 15 standard skies
    • Configure the desired precision on sky type in a YAML config file (under INPUTS/SCENARIOS) : either CIE Standard Sky 5 (uniform sky), or "compute from weather data"
    • Implement the computation of the sky type based on weather data (Igawa, 2014)

    Sources

    KITTLER, Richard – PEREZ, Richard – DARULA, Stanislav. A new generation of sky standards. In Proc. The 8th European Lighting Conf. Lux Europa 1997. May 11 – 14, 1997 Amsterdam. Arnhem: Office NSVV, 1997, p. 359-373.

    DARULA, S. – KITTLER, R. CIE General Sky standard defining luminance distributions. Proc. Conf. eSim 2002. The Canadian conference on building energy simulation. September 11th – 13th, 2002, Montreal, Canada.

    Igawa, N. (2014). Improving the All Sky Model for the luminance and radiance distributions of the sky. Solar Energy, 105, 354–372. https://doi.org/10.1016/j.solener.2014.03.020

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    #129

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