DISCOMFORT GLARE FROM DAYLIGHTING: INFLUENCE OF CULTURE ON DISCOMFORT GLARE PERCEPETION

2018 ◽  
Author(s):  
Clotilde Pierson ◽  
Magali Bodart ◽  
Jan Wienold ◽  
M.B. Piderit
Keyword(s):  
Discomfort Glare

Is there a difference in how people from different socio-environmental contexts perceive discomfort due to glare from daylight?

2021 ◽  
pp. 147715352098353
Author(s):  
C Pierson ◽  
B Piderit ◽  
T Iwata ◽  
M Bodart ◽  
J Wienold
Keyword(s):  
Environmental Context ◽  
Office Buildings ◽  
Visual Discomfort ◽  
Physical Measurements ◽  
Subjective Assessments ◽  
Discomfort Glare

Exposure to daylight has much to offer and should be optimised to maximise its potential. In order to harvest its benefits, any visual discomfort from daylight should be anticipated and minimised. Hence, there is the need to predict discomfort from daylight glare. While more than 20 models for predicting discomfort from daylight glare have been developed, none accurately predict it. The inclusion of additional factors in the models may improve the predictions. One such factor is the socio-environmental context of the observer. This study compares the evaluations of discomfort glare from daylight for office buildings in four socio-environmental contexts: Chile, Belgium, Japan and Switzerland. The evaluations of discomfort glare, each consisting of subjective assessments and physical measurements of a view condition, were collected at the office desks of 401 participants, although only 211 responses were used in the analyses due to exclusion rules. The results do not suggest evidence of an influence of socio-environmental context on discomfort from daylight glare. In other words, the participants in this study perceived discomfort glare similarly, regardless of their socio-environmental context.

scholarly journals Evaluation of Discomfort Glare from Windows

2003 ◽  
Vol 87 (Appendix) ◽  
pp. 61-62
Author(s):  
Yasuko KOGA ◽  
Wonwoo KIM
Keyword(s):  
Discomfort Glare

A dynamic vertical shading optimisation to improve view, visual comfort and operational energy

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Mahdi Valitabar ◽  
Mohammadjavad Mahdavinejad ◽  
Henry Skates ◽  
Peiman Pilechiha
Keyword(s):  
High Performance ◽  
Parametric Design ◽  
Design Method ◽  
Building Energy ◽  
Natural Light ◽  
Visual Comfort ◽  
Content Type ◽  
Operational Energy ◽  
Discomfort Glare ◽  
The Impact

PurposeThe aim of this paper is to present a parametric design method to generate optimum adaptive facades regarding occupants' comfort and building energy criteria. According to the literature review, the following questions have arisen to address the research gaps: Is it possible to have the outside view throughout the whole year without discomfort glare by utilising adaptive solar facades (ASFs)? How can architects integrate both view quality and quantity into ASF design? What is the impact of dynamic vertical shading systems mounted on south facades on the outside view, occupants' visual comfort and operational energy? How can we evaluate the view quantity through multi-layer shading systems?Design/methodology/approachIn recent years, there is a surge in demand for fully glazed buildings, motivating both architects and scholars to explore novel ideas for designing adaptive solar facades. Nevertheless, the view performance of such systems has not been fully explored especially when it comes to the effect of dynamic vertical shading systems mounted on south facades. This fact clarifies the need to conduct more research in this field by taking into account the window view and natural light. Consequently, a simulation research is carried out to investigate the impact of a dynamic shading system with three vertical slats used on the south facade of a single office room located in Tehran, on both view quality and quantity, visual comfort and operational energy. The research attempts to reach a balance between the occupant's requirements and building energy criteria through a multi-objective optimisation. The distinctive feature of the proposed method is generating some optimum shading which could only cover the essential parts of the window area. It was detected from the simulation results that the usage of a dynamic vertical shading system with multi slats for south facades compared to common Venetian blinds can firstly, provide four times more view quantity. Secondly, the view quality is significantly improved through enabling occupants to enjoy the sky layer the entire year. Finally, twice more operational energy can be saved while more natural light can enter the indoor environment without glare. The final outcome of this research contributes toward designing high-performance adaptive solar facades.FindingsThis paper proposes a new metric to evaluate the view quantity through a multi-layer shading system. The proposed method makes it clear that the usage of dynamic vertical shading systems with multi-layers mounted on south facades can bring many benefits to both occupants and building energy criteria. The proposed method could (1) provide four times more view quantity; (2) improve view quality by enabling occupants to watch the sky layer throughout the whole year; (3) slash the operational energy by twice; (4) keep the daylight glare probability (DGP) value in the imperceptible range.Research limitations/implicationsThe research limitations that should be acknowledged are ignoring the impact of the adjacent building on sunlight reflection, which could cause discomfort glare issues. Another point regarding the limitations of the proposed optimisation method is the impact of vertical shading systems on users' visual interests. A field study ought to be conducted to determine which one could provide the more desirable outside view: a vertical or horizontal the view. Research on the view performance of ASFs, especially their impact on the quality of view, is sorely lacking.Originality/valueThis paper (1) analyses the performance of dynamic vertical shadings on south facades; (2) evaluates outside view through multi-layer shading systems; and (3) integrates both view quality and quantity into designing adaptive solar facades.

scholarly journals Daylight Discomfort Glare Evaluation with Evalglare: Influence of Parameters and Methods on the Accuracy of Discomfort Glare Prediction

Buildings ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 94 ◽  
Author(s):  
Clotilde Pierson ◽  
Jan Wienold ◽  
Magali Bodart
Keyword(s):  
Visual Scene ◽  
Detection Methods ◽  
Clear Definition ◽  
Source Detection ◽  
Threshold Method ◽  
Area Method ◽  
Discomfort Glare ◽  
Definition Of ◽  
Statistical Indicators ◽  
Lack Of Knowledge

Nowadays, discomfort glare indices are frequently calculated by using evalglare. Due to the lack of knowledge on the implications of the methods and parameters of evalglare, the default settings are often used. But wrong parameter settings can lead to inappropriate glare source detection and therefore to invalid glare indices calculations and erroneous glare classifications. For that reason, this study aims to assess the influence of several glare source detection methods and parameters on the accuracy of discomfort glare prediction for daylight. This analysis uses two datasets, representative of the two types of discomfort glare: saturation and contrast glare. By computing three different statistical indicators to describe the accuracy of discomfort glare prediction, 63 different settings are compared. The results suggest that the choice of an evalglare method should be done when considering the type of glare that is most likely to occur in the visual scene: the task area method should be preferred for contrast glare scenes, and the threshold method for saturation glare scenes. The parameters that should be favored or avoided are also discussed, although a deeper understanding of the discomfort glare mechanism and a clear definition of a glare source would be necessary to reliably interpret these results.

scholarly journals The Influence of Stimulus Duration on Discomfort Glare for Persons With and Without Visual Correction

1999 ◽  
Vol 1 (2) ◽  
pp. 147-158 ◽  
Author(s):  
Michael Sivak ◽  
Michael J. Flannagan ◽  
Eric C. Traube ◽  
Shinichi Kojima
Keyword(s):  
Stimulus Duration ◽  
Discomfort Glare ◽  
Visual Correction

scholarly journals Discomfort glare perception in daylighting: influencing factors

2017 ◽  
Vol 122 ◽  
pp. 331-336 ◽  
Author(s):  
Clotilde Pierson ◽  
Jan Wienold ◽  
Magali Bodart
Keyword(s):  
Influencing Factors ◽  
Discomfort Glare

scholarly journals Mechanisms for Discomfort Glare in Central Vision

2014 ◽  
Vol 56 (1) ◽  
pp. 464-471 ◽  
Author(s):  
G. Bargary ◽  
Y. Jia ◽  
J. L. Barbur
Keyword(s):  
Central Vision ◽  
Discomfort Glare
Sign in / Sign up

Export Citation Format

Share Document