PhD aplicant, Griffith University
Incorporating use behaviour in glare analysis for office spaces to provide a tool for designers
Daylighting is an important part of architectural design because natural light not only satisfies users with the required luminance for doing their task, but also affects the physiological and psychological health of occupants at different levels. Despite the numerous studies carried out in this area, with respect to the ongoing advancement of new technologies, there exists an opportunity to bring about more complex and also more realistic models to aid designers. While illuminance and visual quality, as well as glare and visual discomfort, are two intrinsic aspects of light, it is worth giving these interconnected factors particular interest simultaneously. It also raises a number of challenges associated with this combination.
User behaviour plays a pivotal role in glare analysis since glare is highly dependant on user view direction. While existing glare analysis methods are based on a fixed view which cannot reflect the real perceived glare by occupants. Hence there is a need to incorporate user behaviour in glare analysis. This work supports future analysis of visual comfort incorporating the effects of gaze shift patterns and views with the goal of designing effective open-plan hot desk spaces.
Abstract: Lighting energy savings, as well as visual and non-visual user benefits have been widely attributed to daylighting. This paper explores daylight design strategy, visual appraisal, Daylight Factor (DF), lighting energy usage and discomfort glare using two green building offices in Malaysia, which have incorporated daylighting into both façade and interior design. Visual appraisal surveys were collected from 39 and 145 subjects in the open plan working space of the Energy Commission Building (ECB) and Public Works Department Block G (PWD), respectively. The survey focused on task brightness, colour appearance, uniformity and lighting preference. Discomfort glare assessed via occupant point-of-view luminance maps was juxtaposed here from a glare study involving the same buildings. Illuminance loggers were used to monitor artificial lighting usage as well as the DF on a selected floor of each building. There were no significant differences in occupant responses to the visual appraisal survey for both office spaces. Using MS1525:2014 and Green Building Index (GBI NRNC) tool as baselines, the DF performance of both offices differs significantly: PWD had a 45.5% daylit area, with ECB a 14.8% daylit area for DF >1%. However, lighting energy usage results show substantial savings of 53% and 41% occurred from daylighting. These findings of visual appraisal, DF, lighting energy savings and discomfort glare show a discrepancy in using only the DF to justify the daylight performance of an office space in a tropical climate such as Malaysia. The findings suggest that equivalent consideration should be given to interior design to facilitate daylighting, which is often beyond the control of designer, but in the hands of office end users.
Pub.: 20 Feb '17, Pinned: 27 Jul '17
Abstract: This study aims to investigate the natural lighting performance of typical educational school premises in Cyprus and propose solutions to improve the visual comfort in classrooms. Natural lighting is an important factor in the design of education buildings as it creates a pleasant environment, it promotes healthier conditions and ensures energy saving. For the purposes of the present research, an in-depth lighting performance analysis was carried out in a typical classroom in Cyprus. A field study carried out through a questionnaire-based survey, as well as through static and dynamic simulations, assessed the lighting performance and visual comfort in educational buildings in Cyprus. The study shows sufficient lighting levels in classrooms in all orientations; however, high lighting contrast and bright visible light source in the field of view causes glare issues, especially in classrooms with east- and west orientation. Conclusions regarding potential improvements are proposed in order to achieve better visual comfort in typical educational school premises in Cyprus and in other areas of southern Europe with similar climatic characteristics and typologies in educational architecture.
Pub.: 03 Jan '17, Pinned: 27 Jul '17
Abstract: In this paper, some well-known buildings’ environmental performance assessment tools and methods are reviewed with regard to the consideration of visual comfort in their structure and assessment process. Specifically, the parameters used for visual comfort's assessment in widely used tools (BREEAM, LEED, SBTool and CASBEE - versions for office buildings) are examined; the type and the kind of criteria used for the assessment, the weightings applied and references to relative standards are reviewed and comparatively assessed. Although the presented results cover the issue of visual comfort as a whole, emphasis is given on daylighting–related factors.
Pub.: 11 Apr '17, Pinned: 27 Jul '17
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