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Relationship between Window-to-Floor Area Ratio and Single-Point Daylight Factor in Varied Residential Rooms in Malaysia
Objectives: Daylight studies on buildings are key aspects of environmental analysis, and can be conducted during early stages of design to ensure environmentally responsive building design. The Malaysian Uniform Building By-law states that rooms should be provided with natural lighting and natural ventilation through one or more windows with a total area of not less than 10% of the clear floor area. This requirement is depicted by the window-to-floor area ratio (WFR). Methods: The by-law is further investigated by determining the relationship between WFR and daylight levels in terms of percentage daylight factor (%DF). The WFR minimum stated in the by-law is assessed using two tests: (1) Determining whether a WFR less than 10% is indeed inadequate for lighting purposes, and (2) Whether a maximum WFR should be imposed to avoid over-lit spaces. Research was conducted in a condominium unit with varied room designs and WFR. Natural illumination data were collected at midpoints of four different rooms for comparison with simultaneous outdoor illumination over a span of several days to obtain average %DF values. Findings: A strong direct relationship exists between WFR and natural illumination levels (in terms of %DF). In a local context, a WFR less than 10% was found to provide sufficient daylight levels in typical rooms, whereas a WFR more than 25% could cause rooms to be over-lit.
Daylight Factor (%DF), Uniform Building By-Law (UBBL), Window-to-Floor Ratio (WFR), Window-to-Wall Ratio (WWR).
- Wilson M, Walker JH, Santamouris M, Jaure S. London: University of North London: Design Process for Energy Efficient New and Refurbished Housing. 2002.
- Al-Tamimi NA, Fadzil SFS. Energy Efficient Envelope Design for High-Rise Residential Buildings in Malaysia. Architectural Science Review. 2012; 55(2):119-27.
- Al-Tamimi NA. Toward Sustainable Building Design: Improving Thermal Performance by Applying Natural Ventilation in Hot–Humid Climate. Indian Journal of Science and Technology. 2015; 8(28):1-8.
- Baker N, Steemers K. Daylight Design of Buildings - A Handbook for Architects and Engineers. 2002.
- Tregenza P, Wilson M. New York: Routledge: Daylighting: Architecture and Lighting Design. 2011.
- Fontoynont M. London: James and James: Daylight Performance of Buildings. 1999.
- IEA (International Energy Agency), and SHC (Solar Heating and Cooling Program). A Source Book on Daylighting Systems and Components. Final report of IEA SHC, energy conservation in buildings and community systems, Task 21. Date accessed: 2014 Sep 5: Available from: http://eetd.lbl.gov/btp/iea21/1eapuba.html.
- IESNA (Illuminating Engineering Society of North America). New York: The IESNA: The IESNA Lighting Handbook. Reference and Application. 9th ed.. 2000.
- Carmody J, Selkowitz S, Heschong L. New York: W.W. Norton & Company: Residential Windows - A Guide to New Technologies and Energy Performance. 1996.
- Strong David. Health, happiness, wellbeing & daylight, 3rd Annual GHA Conference, London. Date accessed: 2014: Available through: http://www.goodhomes.org.uk/downloads/events/David Strong.pdf 11. Kuala Lumpur: Laws of Malaysia: UBBL, Uniform Building By Law Seventeent. 2010.
- Fadzi SF, Tamimi ANA. The Impact of Varied Orientation & Wall Window Ratio (WWR) to Daylight Distribution in Residential Rooms. Malaysia: CIBW107 International Symposium. 2009; p. 478-86.
- Carmody J, Selkowitz S, Lee E, Arasteh D, Willmert T. W.W. New York: Norton & Company: Window Systems for High-Performance Buildings. 2004 Apr.
- Phillips D. Taylor & Francis: Lighting Modern Buildings. 2013 Jun 17.
- Hopkinson RG, Petherbridge P, Longmore J. London: William Heinemann Ltd. Daylighting 1st edit. 1996.
- Longmore J. Daylighting: a current view, Light and Lighting. 1975; 68(3):113‐19.
- Crisp VHS, Littlefair PJ. Average Daylight Factor Prediction. Cambridge: CIBS National Lighting Conference. 1984; p. 234-43.
- London: Chartered Institution of Building Services Engineers. CIBSE Daylighting and window design lighting guide LG10. 1999.
- London: BSI British Standard: Lighting for buildings Part 2: Code for practice for daylighting. 1992 June.
- Dubois M. Lund University, Lund Institute of Technology, Department of Construction & Architecture: Impact of shading devices on daylight quality in offices; Simulations with Radiance. 2001.
- Dietrich U. Daylight - Characteristics and Basic Design Principles, Lighting Design: Principles, Implementation, Case Studies. 2006; p. 16-41.
- Ne’eman E, Hopkinson RG. Critical minimum acceptable window size: a study of window design and provision of a view. International Journal of Lighting Research and Technology. 1970; 2(17):17-26.
- Liping W. Facade design optimization for naturally ventilated residential buildings in Singapore. Energy and Buildings. 2007; 39(8):954-61.
- Lam JC. Residential Sector Air Conditioning Loads and Electricity Use in Hong Kong. Energy Conversion and Management. 2000; 41(16):1757-68.
- Ghisi E, Tinker J. Optimizing Energy Consumption in Offices as a Function of Window Area and Room Size. Rio De Janeiro, Brazil: Seventh International IBPSA Conference. 2001.
- Muhaisen A, Dabboor H. Studying the Impact of Orientation, Size, and Glass Material of Windows on Heating and Cooling Energy Demand of the Gaza Strip Buildings. Journal of Architecture and Planning. 2015; 27(1):1-15.
- Butler DL, Steuerwald BL. Effects of view and room size on window size preferences made in models. Environment and Behavior. 1991; 23(3):334-58.
- MMD 2009. Malaysian Metrological Department. General Climate of Malaysia. 2011 Feb.
- Kuala Lumpur: BSEEP, Presentation for the Prime Minister’s Green Tech and Climate Change Council Meeting. Realising the 3 Key Benefits of Energy Efficient Buildings. 2014.
- Sykes AO. Chicago: An Introduction to Regression Analysis. 1992.
- Mui KWA, Wong LT. Neutral temperature in subtropical climates - A field survey in air-conditioned offices. Building and Environment. 2007; 42:699–706.
- Srivajana W. Effects of Air Velocitv on Thermal Comfort in Hot and Humid Climates. Thammasat International Journal of Science and Technology. 2003 Apr – Jun; 8(2):1-10.
- Kubota T, Ahmad S. Questionnaire Survey on Behavior for Natural Ventilation and Electricity Consumption in Terraced Houses: A case study of Johor Bahru City. 1996 Sep 11-14; p. 1–13.
- Kotey NA. University of Waterloo: Measurements and Models Related to Solar Optics in Windows with Shading Devices. 2009 13 Apr.
- Edmonds IR, Greenup PJ. Daylighting in the Tropics. Solar Energy. 2002; 73(2):111–21.
- Arabi F. Effect of Natural Light Glare on Passive Design in Malaysian Government Office Building. 2012; 1(4):393–404.
- Abdullah A, Fadzil SFS, Al-Tamimi NAM. Penang, Malaysia: Daylight Illumination Levels in Varied Room Configurations At the View Condominium. Penang: University Science Malaysia (USM) Press: Bakar AHA & Razak AA, eds. 3rd International Conference on Built Environment Countries. 2009; p. 434–47.
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