Evaluating Human Visual Preference and Performance in an Office Environment Using Luminance-based Metrics PDF Download
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Author: Kevin G. Van Den Wymelenberg
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 328
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Book Description
There are not adequate human factors research studies available that examine luminance-based measures as they relate to human visual preference and acceptance in spaces with daylight. The objective of this research is to study several luminance-based metrics to support improved integrated lighting design recommendations, computational analysis methods and control technologies. Therefore, this dissertation executed a two-day pilot study (n=18) and a six-month repeated-measures experiment (n=45) in mock office spaces under naturally occurring daylight conditions in Boise, Idaho. Recent developments in High Dynamic Range digital photography permit investigation of high-resolution luminance-based metrics. Once these metrics and associated recommended criteria are established, they can support computational daylighting design analysis and integrated luminous environmental control systems to improve occupant satisfaction and increase energy savings over traditional illuminance-based methods. This dissertation also examined human visual performance differences in scenes rated as visually comfortable and those having "just uncomfortable glare." This was done to determine if, and to what extent, visual performance decrements exist under uncomfortable conditions. Luminance-based metrics proved more capable than illuminance-based metrics at fitting the range of subjective responses on visual comfort items. Standard deviation of window luminance produced the highest adjusted squared correlation coefficient of any single metric with subjective responses ([subscript] adj r2=0.38, F1,860=536, p-value0.01). Additionally, metrics based upon luminance within the 40° horizontal band of vision performed strongly. A bounded-borderline between comfort and discomfort is proposed as preliminary criteria for several of the highest-ranked metrics. Illuminance-based metrics, traditional luminance ratios and the recently proposed Daylight Glare Probability were less able to fit subjective responses. The strongest multiple regression model was for the "too dim-too bright" rating of the window wall ([subscript] adj R2=0.49, F3,688=222, p-value
Author: Kevin G. Van Den Wymelenberg
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 328
Get Book Here
Book Description
There are not adequate human factors research studies available that examine luminance-based measures as they relate to human visual preference and acceptance in spaces with daylight. The objective of this research is to study several luminance-based metrics to support improved integrated lighting design recommendations, computational analysis methods and control technologies. Therefore, this dissertation executed a two-day pilot study (n=18) and a six-month repeated-measures experiment (n=45) in mock office spaces under naturally occurring daylight conditions in Boise, Idaho. Recent developments in High Dynamic Range digital photography permit investigation of high-resolution luminance-based metrics. Once these metrics and associated recommended criteria are established, they can support computational daylighting design analysis and integrated luminous environmental control systems to improve occupant satisfaction and increase energy savings over traditional illuminance-based methods. This dissertation also examined human visual performance differences in scenes rated as visually comfortable and those having "just uncomfortable glare." This was done to determine if, and to what extent, visual performance decrements exist under uncomfortable conditions. Luminance-based metrics proved more capable than illuminance-based metrics at fitting the range of subjective responses on visual comfort items. Standard deviation of window luminance produced the highest adjusted squared correlation coefficient of any single metric with subjective responses ([subscript] adj r2=0.38, F1,860=536, p-value0.01). Additionally, metrics based upon luminance within the 40° horizontal band of vision performed strongly. A bounded-borderline between comfort and discomfort is proposed as preliminary criteria for several of the highest-ranked metrics. Illuminance-based metrics, traditional luminance ratios and the recently proposed Daylight Glare Probability were less able to fit subjective responses. The strongest multiple regression model was for the "too dim-too bright" rating of the window wall ([subscript] adj R2=0.49, F3,688=222, p-value
Author: Christopher Meek
Publisher: Routledge
ISBN: 1317673360
Category : Architecture
Languages : en
Pages : 183
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Book Description
Daylighting and Integrated Lighting Design provides architects, building designers, and students clear direction for the successful inclusion of daylight and integrated electric light in buildings. It presents design teams with the performance analysis resources, energy saving estimates and user satisfaction results they need in order to make informed decisions regarding daylighting and lighting design. Written by two well-known experts in the field, the book provides: critical geometric and material relationships along with proven design process activities, offered in a quick-reference format, with sufficient context to address the range of associated issues present in any building project both the "fundamentals" and "applications" which cover design concepts and practice activities applicable to all integrated lighting projects specific directives for how the concepts covered are applied in a range of common design scenarios, including architectural rules-of-thumb, instructions for ensuring visual comfort, and preferred approaches for electric lighting control integration. In demonstrating these necessary insights to designers, the authors employ an iterative analysis of common "daylighting patterns" and illustrate and annotate both successful and unsuccessful examples via built form and simulation. Part of the PocketArchitecture series, this is the ideal pocketbook for any designer serious about reducing the energy impact of their buildings.
Author: Kyle Konis
Publisher: Springer
ISBN: 3319394630
Category : Technology & Engineering
Languages : en
Pages : 282
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Book Description
The book explores advanced building-facade daylighting design practices based on diverse energy and human-factor performance metrics. It also defines effective daylighting by rethinking the simplified approach to glazing and facade systems to incorporate the local climate and the needs of building occupants as critical drivers of building performance, design solutions and technological innovation. It discusses state-of-the-art approaches in the context of simulation-based design workflows, innovative technologies and real project case studies, all targeting low and net-zero energy solutions that enhance occupant comfort. Readers benefit from a comprehensive approach that improves the feedback loop between design intent and performance in use. The book is intended for architects, lighting designers, facade engineers, manufacturers and building owners/operators, as well as advanced students.
Author: Greg Ward Larson
Publisher:
ISBN: 9780974538105
Category : Light
Languages : en
Pages : 0
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Book Description
Author: Peter Robert Boyce
Publisher: CRC Press
ISBN: 9780748409501
Category : Technology & Engineering
Languages : en
Pages : 602
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Book Description
The availability of electric lighting has changed the lives of people the world over and lighting is a major consumer of energy, yet little has been written about the forms of lighting that can alter human visual capabilities and enhance productivity, ensure comfort and create appropriate lighting conditions. It is important to understand the forms of lighting available, and their appropriateness to specific activities, in order to apply the technology most effectively. This book is a comprehensive review of the interaction of people and lighting and supercedes the author's classic Human Factors in Lighting. The technology has changed markedly in recent years with the introduction of new light sources and new methods of light distribution. The significance of specialist lighting applications, such as photobiology, are now becoming better understood. The nature of work itself has changed, and hence so have lighting requirements. Equally, the development of the technology has created new opportunities for improving peoples' work and leisure environments.
Author: International Commission on Illumination
Publisher:
ISBN:
Category : Electric lighting
Languages : en
Pages : 50
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Book Description
Author: Marc Fontoynont
Publisher: Routledge
ISBN: 1134257139
Category : Architecture
Languages : en
Pages : 847
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Book Description
As part of Daylight Europe, the daylighting behaviour of 60 buildings was observed and measured during a three year period. Buildings of many different types, sizes and ages were included - from offices to museums, libraries, churches, houses, airports and factories; from Classical buildings to modern constructions, and from a small single room to an office of over 100,000 square meters. The results of the study of each building are presented, extensively illustrated in colour, with the unusual features and main lessons highlighted. The book also includes details of the monitoring procedures, the results of and comparisons with simulations, the outcome of post-occupancy evaluation, and a summary of the major findings. These show the extraordinary potential of daylighting techniques to improve amenity and energy performance for the benefit of the occupants and building managers. They also demonstrate how often opportunities are missed, and the frequency of problems of overheating or glare. Above all, they demonstrate the beauty, elegance and scope of daylight design.
Author: Jan Wienold
Publisher:
ISBN: 9783839601624
Category :
Languages : en
Pages : 132
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Book Description
The influence of discomfort glare is often underestimated in daylighting design and in the use of buildings. Many façade solutions are intended to increase the amount of daylight penetrating the room and creating a glare free environment at the same time. But as soon as a planning process comes to the point to quantify the glare freeness of a solution, the question of suitable glare measure arises. To analyze the reliability of existing glare rating methods, user assessments under real daylight conditions in office like test rooms are designed and carried out at two sites using different Venetian blinds and a foil system. For the evaluation of high dynamic digital images, a new tool "evalglare" is developed. The existing glare rating models show moderate or poor correlations with the user's perception of glare. The window luminance as single glare descriptor exhibits no correlation at all. On the basis of the user assessments a new daylight glare rating - the daylight glare probability DGP - is developed and validated. The DGP describes the probability that a person is disturbed by daylight glare. The DGP is also used as a basic glare descriptor for new climate based glare evaluation methods, which enables an assessment of daylight glare for a full year data set within a design process. For the evaluation, a glare rating classification based on simulations and frequency distributions is proposed.
Author: Christopher Cuttle
Publisher: Routledge
ISBN: 1317631501
Category : Architecture
Languages : en
Pages : 183
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Book Description
By reading this book, you will develop the skills to perceive a space and its contents in light, and be able to devise a layout of luminaires that will provide that lit appearance. Written by renowned lighting expert Christopher (Kit) Cuttle, the book: explains the difference between vision and perception, which is the distinction between providing lighting to make things visible, and providing it to influence the appearance of everything that is visible; demonstrates how lighting patterns generated by three-dimensional objects interacting with directional lighting are strongly influential upon how the visual perception process enables us to recognize object attributes, such as lightness, colourfulness, texture and gloss; reveals how a designer who understands the role of these lighting patterns in the perceptual process may employ them either to reveal, or to subdue, or to enhance the appearance of selected object attributes by creating appropriate spatial distributions of light; carefully explains calculational techniques and provides easy-to-use spreadsheets, so that layouts of lamps and luminaires are derived that can be relied upon to achieve the required illumination distributions. Practical lighting design involves devising three-dimensional light fields that create luminous hierarchies related to the visual significance of each element within a scene. By providing you with everything you need to develop a design concept - from the understanding of how lighting influences human perceptions of surroundings, through to engineering efficient and effective lighting solutions – Kit Cuttle instills in his readers a new-found confidence in lighting design.
Author: Nicole L. Peterson
Publisher:
ISBN:
Category : Daylighting
Languages : en
Pages : 94
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Book Description
This thesis identifies and explores computer-based lighting metrics, assessing their effectiveness in evaluating the quality and quantity of daylight to bridge the space between research and practice. Ultimately, this thesis will demonstrate why using singular metrics is not as effective as using several, complementary metrics in expressing the luminous environment. There are many challenges in practice and research- respectively, time or capabilities of a design team and lack of transparency or unrealistic metric criteria. Moreover, each metric- illuminance and luminance, point-in-time and annual- addresses different luminous qualities. It is critical to understand the nuances, as the results and corresponding design recommendations are highly dependent on the metrics used, and each metric carries technical inadequacies and limitations. Aiming to study these challenges and critique the current landscape of computational lighting design, the objectives of this thesis are to: 1) Evaluate computational lighting metrics for their ability to provide an understanding of the luminous environment, and 2) Investigate the capabilities, assumptions, and methods used in computational lighting metrics as they are developed in the research community and used in practice. These objectives are examined with exploratory vignettes. The vignettes elucidate each metric's strengths, limitations, and assumptions in a clearer, holistic way so that consultants within the field will be more knowledgeable. The outcome is a compendium of information and guidelines to help designers make informed decisions as they relate to selecting appropriate daylight metrics.
