Abstract: Field work measurement in the East room from previous work were found to be 2.28% with a wall to window ratio (WWR) of 50% and a %DF of 1.23% for a modified WWR of 25%. This paper examines the extent of the field work %DF values compared to the %DF values that could be derived for similar cases while using alternative methods. The alternative methods include Building Research Station (BRS) protractors and three other simulation software including ECOTECT, IES and ReLux. Results found that the %DF differences between field work values and the alternative methods were minimal. This proves that the %DF method is still a very reliable method for daylight assessment

• Publication Date: 13-Mar-2016
• DOI: 10.15224/978-1-63248-086-6-10
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Abstract: This paper suggests a way to measure %DF using fieldwork data by taking samples in residential rooms at the University Science Malaysia. The two rooms face east and west for comparison. Two varied window to wall (WWR) and window to floor (WFR) ratios were tested for this experiment. The %DF values calculated from this research were analysed by comparing the east-facing room to the west-facing room and by comparing the different WWR and WFR. The results indicate that given the dynamic and varying sky conditions, east-facing rooms resulted in higher %DF values in both WWR and WFR. It is also found that in Malaysian skies, a 1%DF value is a good estimate for a residential room natural illumination level.

• Publication Date: 13-Mar-2016
• DOI: 10.15224/978-1-63248-086-6-29
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