Analysis of daylight factors and energy saving allowed by windows under overcast sky conditions |
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| Affiliation: | 1. Department of Physics, School of Exact Sciences, National University of Salta, Bolivia Avenue #5150, 4400 Salta Capital, Salta, Argentina;2. GERSolar, Institute of Ecology and Sustainable Development, Basic Sciences Department, National University of Lujan, Route 5 and Constitución Avenue, 6700 Luján, Buenos Aires, Argentina;3. Grupo de Pesquisas em Fontes Alternativas de Energía, Universidade Federal de Pernambuco, Av. Prof. Luiz Freire 1000, 50740-540 Recife, PE, Brazil;1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023, China;2. Key Laboratory for Solar Energy Photovoltaic System of Liaoning Province, Dalian 116023, China;3. Department of Physics, Balochistan University of Information Technology, Engineering & Management Sciences, Quetta, Pakistan;4. Qingdao Longsun Silicon Technology Ltd., Qingdao 266000, China;5. Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, Dalian University of Technology, Dalian 116024, China;1. Department of Industrial Engineering, University of Naples “Federico II”, Italy;2. Department of Energy, Information Engineering and Mathematical Models, University of Palermo, Italy;1. School of Civil Engineering, University of Granada, Granada, Spain;2. School of Engineering and Built Environment, Edinburgh Napier University, Edinburgh, Scotland, UK;3. Faculty of logistics, University of Maribor, Maribor, Slovenia;4. Köster Lichtplanung, Karl-Bieber Höhe 15, D-60437 Frankfurt, Germany |
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| 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. |
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| Keywords: | Window Daylight factor Daylighting Overcast sky Lighting simulation program Energy saving |
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