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Analysis of daylight factors and energy saving allowed by windows under overcast sky conditions

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  • Acosta, Ignacio
  • Munoz, Carmen
  • Campano, Miguel Angel
  • Navarro, Jaime

Abstract

The aim of this research is to quantify the daylight factors produced inside a room for different models of windows, and to conduct an analysis of the results obtained. All trials were performed under overcast sky conditions, as these represent the worst case scenario for calculation. The shape, size and position of the window are variable, as is the reflectance of the inner surfaces of the room. A total of 28 simulations are provided by the lighting simulation program Daylight Visualizer 2.6, validated by the CIE test cases. After trials it was concluded that square windows produce daylight factors slightly higher than those obtained with horizontal windows and noticeably higher than those measured with vertical windows, considering the same surface of openings. It is confirmed that the daylight factors are directly proportional to the glass surface, except in the area near the window. It is also concluded that the windows in the upper position allow higher luminance at the back of the room than those in centered locations. Finally, the energy savings produced by the different models of windows is calculated.

Suggested Citation

  • Acosta, Ignacio & Munoz, Carmen & Campano, Miguel Angel & Navarro, Jaime, 2015. "Analysis of daylight factors and energy saving allowed by windows under overcast sky conditions," Renewable Energy, Elsevier, vol. 77(C), pages 194-207.
    • Handle: RePEc:eee:renene:v:77:y:2015:i:c:p:194-207
    DOI: 10.1016/j.renene.2014.12.017
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    References listed on IDEAS

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    1. Acosta, Ignacio & Navarro, Jaime & Sendra, Juan José, 2014. "Lighting design in courtyards: Predictive method of daylight factors under overcast sky conditions," Renewable Energy, Elsevier, vol. 71(C), pages 243-254.
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    3. Ignacio Acosta & Jaime Navarro & Juan J. Sendra, 2011. "Towards an Analysis of Daylighting Simulation Software," Energies, MDPI, vol. 4(7), pages 1-15, June.
    4. Al-Sallal, Khaled A., 1998. "Sizing windows to achieve passive cooling, passive heating, and daylighting in hot arid regions," Renewable Energy, Elsevier, vol. 14(1), pages 365-371.
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    7. Ignacio Acosta & Miguel Ángel Campano & Samuel Domínguez-Amarillo & Carmen Muñoz, 2018. "Dynamic Daylight Metrics for Electricity Savings in Offices: Window Size and Climate Smart Lighting Management," Energies, MDPI, vol. 11(11), pages 1-27, November.
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