"A comparative gaze responsive comfort evaluation" by Mandana Sarey Khanie
Mandana Sarey Khanie (DK)
Technical University of Denmark
Lecture from the 7th VELUX Daylight Symposium “Healthy & climate-friendly architecture– from knowledge to practice” that took place in Berlin on 3-4 May 2017. For more information visit http://thedaylightsite.com
“A comparative gaze responsive comfort evaluation for glare control strategies using gaze behavior analysis and discomfort glare assessment” by Mandana Sarey Khanie, Paul Rogers, Jan Wienold, Marilyne Andersen. Visual comfort is one of the main concerns for ensuring health and wellbeing in building sector recommended by sustainability certification methods such as British Environmental Assessment (BREEAM). The visual comfort topic is addressed under the issue criteria Hea 01 in the current version of the BREEAM rating system to ensure visual performance and comfort for building occupants for best practice.
With the aim of bringing recognition to low environmental impact buildings, a scoring system followed by recommendations such as glare control strategies are defined. Glare control strategies are mainly recommended to design out discomforting and disabling glare for best integration of daylight bringing one credit point to the assessment. Nevertheless, in geographical regions lying between 55-60 latitude, selections of glaze control strategies are sensitized due to low sun angle position which is not captured by many recommended glare control compliant forms. In this study seven glare control forms are evaluated for adaptation in the mentioned geographical area.
The evaluation method is based on a gaze responsive comfort assessment method where a parallel comparative approach for gaze behavior and visual comfort prediction is adopted. Depending on the occupants’ seating position and gaze direction, light distribution in the field-of-view can range from interesting highlights to visually discomforting situations which make visual comfort highly dependent on dynamics of occupants’ gaze-direction. Therefore gaze-behavior study which identifies gaze responses to light variations across the FOV was done using a predicting gaze responsive light-driven (GRL) model. This model is developed on an experimental study using a novel gaze-driven photometry for observing natural gaze behavior under conditions implicitly constrained by the real world luminous environment. On the other hand, there are several discomfort glare metrics that can be used to predict glare risks.
For daylight induced glare the commonly used glare metric is daylight glare probability which was used in this study. Implementing the two prediction models, a simulation study was done for a generic side-lit room. Seven glare control complaint forms were compared. We will present here the comparative gaze responsive comfort evaluation and its application in practice on a very specific requirement for environmentally certified building evaluation for seven glare control systems.
Mandana Sarey Khanie is currently a Postdoctoral researcher at Technical University of Denmark at the Building and Energy section of civil engineering department where she is focusing on energy and daylight question in residential buildings. Mandana completed her PhD Thesis at interdisciplinary Laboratory of Performance-Integrated Design (LIPID) at EPFL focusing on the development of a novel gaze-driven photometry for observing natural gaze behavior in relation to conditions implicitly constrained by real world luminous environment. The research was funded thereafter by Swiss National Foundation (SNSF) and continued towards development of a preliminary mathematical model (GRL) for gaze response predictions in relation to light compositions in architectural spaces. Mandana has experiences as scientific consultant for Smart-living lab, Switzerland, Daylight specialist at Åf groups, Sweden, and architectural lighting consultant.