A pinboard by
Zahra Hamedani

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.


Daylight performance and users’ visual appraisal for green building offices in Malaysia

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