A double-pane window with enclosed horizontal slats for daylighting in buildings in the tropics
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Author list: Chaiwiwatworakul P., Chirarattananon S.
Publisher: Elsevier
Publication year: 2013
Journal: Energy and Buildings (0378-7788)
Volume number: 62
Start page: 27
End page: 36
Number of pages: 10
ISSN: 0378-7788
eISSN: 1872-6178
Languages: English-Great Britain (EN-GB)
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Abstract
In the tropics, daylighting from a side window requires shading to intercept direct sunlight from the window whilst allowing penetration of daylight from sky. In this paper, daylighting from a double-pane glazed window with enclosed horizontal slats (slat window) was investigated for which it is situated on either north or south wall of a room. Full-scale experiments and simulations were conducted to characterize distribution of the interior daylight from the slat window under a real tropical climate. Performance of the slat window was evaluated in terms of the "useful daylight illuminance" (UDI), interior daylight availability and light power density (LPD) of an integrated dimmable lighting system. Empirical formulas were developed for determining annual average LPD values of the dimmable lighting system over its served area. The LPD value can be used with a reduced form of the energy equation of Thailand's building energy code to evaluate the reduced annual electrical energy consumption for accreditation of the daylight use in a building. The analysis of life cycle cost proved that the daylighting from the slat window integrated with the dimmable lighting system is cost effective. ฉ 2013 Elsevier B.V.
Keywords
Light power density, Lumen method, Slat window, Tropical climate, Useful daylight illuminance
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