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Effect of Sky Discretization for Shading Device Calculation on Building Energy Performance Simulations

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  • Ismael R. Maestre

    (Escuela Politécnica Superior de Algeciras, University of Cadiz, 11202 Cadiz, Spain)

  • Juan Luis Foncubierta Blázquez

    (Escuela Politécnica Superior de Algeciras, University of Cadiz, 11202 Cadiz, Spain)

  • Francisco Javier González Gallero

    (Escuela Politécnica Superior de Algeciras, University of Cadiz, 11202 Cadiz, Spain)

  • J. Daniel Mena Baladés

    (Escuela Politécnica Superior de Algeciras, University of Cadiz, 11202 Cadiz, Spain)

Abstract

The calculation of sunlit surfaces in a building has always been a relevant aspect in building energy simulation programs. Due to the high computational cost, some programs use algorithms for shading calculation for certain solar positions after discretization of hemispherical sky. The influence of the level of discretization on the estimation of incident direct radiation on building surfaces, as well as on the required computational times, are studied in this work. The direct solar energy on a window for a year, with simulation time steps of five minutes, has been simulated by using an algorithm based on Projection and Clipping Methods. A total of 6144 simulations have been carried out, varying window sizes, window orientations, typologies of shading devices, latitudes and discretization levels of the hemispherical sky. In terms of annual incident solar energy, the results show that maximum error values are about 5% for a low level of angular discretization. Errors up to 22% in hourly incident solar energy have been estimated for some of the configurations analysed. Furthermore, a great number of configurations show errors of shading factor on a window of up to 30%, which could be most relevant in studies of natural lighting. The study also shows that the improvement achieved by the most accurate discretization level implies an increase in computational cost of about 30 times.

Suggested Citation

  • Ismael R. Maestre & Juan Luis Foncubierta Blázquez & Francisco Javier González Gallero & J. Daniel Mena Baladés, 2020. "Effect of Sky Discretization for Shading Device Calculation on Building Energy Performance Simulations," Energies, MDPI, vol. 13(6), pages 1-14, March.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:6:p:1381-:d:333194
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    References listed on IDEAS

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    1. Kirimtat, Ayca & Koyunbaba, Basak Kundakci & Chatzikonstantinou, Ioannis & Sariyildiz, Sevil, 2016. "Review of simulation modeling for shading devices in buildings," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 23-49.
    2. Ahmed Abdel-Ghany & Ibrahim Al-Helal & Fahad Alkoaik & Abdullah Alsadon & Mohamed Shady & Abdullah Ibrahim, 2019. "Predicting the Cooling Potential of Different Shading Methods for Greenhouses in Arid Regions," Energies, MDPI, vol. 12(24), pages 1-13, December.
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    Cited by:

    1. Simeng Li & Yanqiu Cui & Nerija Banaitienė & Chunlu Liu & Mark B. Luther, 2021. "Sensitivity Analysis for Carbon Emissions of Prefabricated Residential Buildings with Window Design Elements," Energies, MDPI, vol. 14(19), pages 1-25, October.

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