Occupant density and daylight illuminance level fluctuation for office building in Malaysia

Daylighting has yet to be fully utilised in the office interiors even though Malaysia has abundant natural light throughout the year and highly dependent on artificial lighting. However, there is always fluctuation of illuminance in office spaces and this can cause problems to occupants which affect...

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Main Author:	Mohd. Husini, Elina
Format:	Thesis
Language:	English
Published:	2016
Subjects:	QE Geology
Online Access:	http://eprints.utm.my/id/eprint/77930/1/ElinaMohdHusiniPFAB2016.pdf
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id	my-utm-ep.77930
record_format	uketd_dc
spelling	my-utm-ep.779302018-07-23T06:00:21Z Occupant density and daylight illuminance level fluctuation for office building in Malaysia 2016-03 Mohd. Husini, Elina QE Geology Daylighting has yet to be fully utilised in the office interiors even though Malaysia has abundant natural light throughout the year and highly dependent on artificial lighting. However, there is always fluctuation of illuminance in office spaces and this can cause problems to occupants which affect visual and work performance. The aim of this study is to investigate fluctuation in daylight illuminance that affects visual comfort and visual performance. This study also investigates the effects of occupant density in office space in a typical layout of office building. In the first phase of the study, a visual test has been conducted involving seventy two office workers and assessment using a questionnaires survey on one hundred and eighty one office workers. Experiment through visual test was conducted in the office space which involved groups of occupants in office buildings. Furthermore, four groups of office workers numbering five, ten, fifteen and twenty per group were subsequently assigned to the office to detect fluctuations by computer simulation using IES Software. The result of the experiment evidenced that the level of illuminance in the office was 300 lux to 400 lux while preferred illuminance level was 280 lux to 350 lux. However, the occupants performed their tasks well in higher illumination range of 400 lux to 600 lux. Findings from experiment of visual performance and daylighting simulation showed there was fluctuation influenced by the number of occupants. When occupancy was less than 50%, the fluctuation was acceptable for visual comfort. However, when the occupancy was more than 50%, it would lead to higher fluctuation and the illumination level of recommended standard (300 lux to 400 lux) was not achievable. The findings contribute towards the improvement of an acceptable visual comfort ranges for Malaysian Standard of lighting condition and assist architects and designers to have better understanding in quality and quantity of daylighting and strategies on energy saving. 2016-03 Thesis http://eprints.utm.my/id/eprint/77930/ http://eprints.utm.my/id/eprint/77930/1/ElinaMohdHusiniPFAB2016.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:98229 phd doctoral Universiti Teknologi Malaysia, Faculty of Built Environment Faculty of Built Environment
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QE Geology
spellingShingle	QE Geology Mohd. Husini, Elina Occupant density and daylight illuminance level fluctuation for office building in Malaysia
description	Daylighting has yet to be fully utilised in the office interiors even though Malaysia has abundant natural light throughout the year and highly dependent on artificial lighting. However, there is always fluctuation of illuminance in office spaces and this can cause problems to occupants which affect visual and work performance. The aim of this study is to investigate fluctuation in daylight illuminance that affects visual comfort and visual performance. This study also investigates the effects of occupant density in office space in a typical layout of office building. In the first phase of the study, a visual test has been conducted involving seventy two office workers and assessment using a questionnaires survey on one hundred and eighty one office workers. Experiment through visual test was conducted in the office space which involved groups of occupants in office buildings. Furthermore, four groups of office workers numbering five, ten, fifteen and twenty per group were subsequently assigned to the office to detect fluctuations by computer simulation using IES Software. The result of the experiment evidenced that the level of illuminance in the office was 300 lux to 400 lux while preferred illuminance level was 280 lux to 350 lux. However, the occupants performed their tasks well in higher illumination range of 400 lux to 600 lux. Findings from experiment of visual performance and daylighting simulation showed there was fluctuation influenced by the number of occupants. When occupancy was less than 50%, the fluctuation was acceptable for visual comfort. However, when the occupancy was more than 50%, it would lead to higher fluctuation and the illumination level of recommended standard (300 lux to 400 lux) was not achievable. The findings contribute towards the improvement of an acceptable visual comfort ranges for Malaysian Standard of lighting condition and assist architects and designers to have better understanding in quality and quantity of daylighting and strategies on energy saving.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Mohd. Husini, Elina
author_facet	Mohd. Husini, Elina
author_sort	Mohd. Husini, Elina
title	Occupant density and daylight illuminance level fluctuation for office building in Malaysia
title_short	Occupant density and daylight illuminance level fluctuation for office building in Malaysia
title_full	Occupant density and daylight illuminance level fluctuation for office building in Malaysia
title_fullStr	Occupant density and daylight illuminance level fluctuation for office building in Malaysia
title_full_unstemmed	Occupant density and daylight illuminance level fluctuation for office building in Malaysia
title_sort	occupant density and daylight illuminance level fluctuation for office building in malaysia
granting_institution	Universiti Teknologi Malaysia, Faculty of Built Environment
granting_department	Faculty of Built Environment
publishDate	2016
url	http://eprints.utm.my/id/eprint/77930/1/ElinaMohdHusiniPFAB2016.pdf
_version_	1747817865668460544

Occupant density and daylight illuminance level fluctuation for office building in Malaysia

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