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A comparison of luminous efficacy models with illuminance and irradiance measurements

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  • Vartiainen, Eero

Abstract

Several luminous efficacy models have been tested against simultaneous illuminance and irradiance measurements in Helsinki, Finland (60°11′N, 24°50′E). When compared with the measured values, the Perez luminous efficacy model had the lowest relative root mean square difference (RMSD) of 6.7%. All tested models had an RMSD within 2% of the constant model which used the measured yearly average of 110 lm/W as the constant. For all models, the error was smaller for high solar altitudes but greater for the low altitudes. The monthly average luminous efficacy was fairly constant between April and October but it was clearly lower during the winter months when the sun is very low.

Suggested Citation

  • Vartiainen, Eero, 2000. "A comparison of luminous efficacy models with illuminance and irradiance measurements," Renewable Energy, Elsevier, vol. 20(3), pages 265-277.
    • Handle: RePEc:eee:renene:v:20:y:2000:i:3:p:265-277
    DOI: 10.1016/S0960-1481(99)00115-9
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    References listed on IDEAS

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    1. Vartiainen, Eero, 1999. "An anisotropic shadow ring correction method for the horizontal diffuse irradiance measurements," Renewable Energy, Elsevier, vol. 17(3), pages 311-317.
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    Cited by:

    1. Beccali, M. & Finocchiaro, P. & Ippolito, M.G. & Leone, G. & Panno, D. & Zizzo, G., 2018. "Analysis of some renewable energy uses and demand side measures for hotels on small Mediterranean islands: A case study," Energy, Elsevier, vol. 157(C), pages 106-114.
    2. Singh, M.C. & Garg, S.N., 2010. "Illuminance estimation and daylighting energy savings for Indian regions," Renewable Energy, Elsevier, vol. 35(3), pages 703-711.
    3. Dieste-Velasco, M.I. & Díez-Mediavilla, M. & Granados-López, D. & González-Peña, D. & Alonso-Tristán, C., 2019. "Performance of global luminous efficacy models and proposal of a new model for daylighting in Burgos, Spain," Renewable Energy, Elsevier, vol. 133(C), pages 1000-1010.

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