Conventional wisdom holds that carefully designed exterior louver systems tuned to a building'... more Conventional wisdom holds that carefully designed exterior louver systems tuned to a building's earth latitude and its glass wall's compass orientations do a better job of regulating sunlight than interior louver systems due to the intuition-friendly observation that exterior systems reflect or shade the sunlight before it ever enters the building. A multi-criteria, multi-variable analysis performed on a 3600 SF multipurpose space came to different conclusions. The results showed that when accounting for such design criteria as carbon footprint, glare, optimal daylighting and solar heat gain of the interior, tuned exterior louvers perform well against some measures but fared poorly in others, making the decision between types of louver systems a matter of setting performance priorities and aesthetic preference in any given building. This paper summarizes a student's independent research study in which she tested her studio project's arrangement of sun louvers in a la...
Carbon impact estimation software programs have simplified the processes for evaluating the carbo... more Carbon impact estimation software programs have simplified the processes for evaluating the carbon contribution of proposed buildings and can be relatively accurate down to building assembly. However, the simplifying assumption that a building's embodied carbon is entirely a function of the production and installation, while a building's carbon-in-use is the province of a building's operational life can lead to misleading results, and hence, faulty decisions, when the lifespans of a building's individual materials differ greatly from the building's lifespan. The primary study became a way to point out those disparities between material life expectancy and carbon impact by studying the impact of three alternative roof assemblies.
This paper reports on an experimental study that investigated the impact of clear and diffusing g... more This paper reports on an experimental study that investigated the impact of clear and diffusing glass types on the design and performance of daylighting systems. Scale models of toplighting and sidelighting systems were tested in the lab under the standard CIE overcast sky. Quantitative analysis of the test results documented, with a good level of accuracy, the impact of different glass types on the overall efficiency of daylighting systems, and showed their impact on the distribution of light intensities inside the spaces tested. The findings and recommendations of this study should be helpful to architects and engineers who do design (or engineer) daylighting systems
This paper addresses a timely topic, which is designing and enhancing the performance of daylight... more This paper addresses a timely topic, which is designing and enhancing the performance of daylighting systems in buildings early in the design phase. Currently in academia, the design of daylighting systems lacks the emphasis, rigor, and time normally given to electric lighting systems. However, only in a few higher education institutions, more attention is being gradually given to the study of daylighting systems. Undoubtedly, the substantial environmental and economic benefits of daylighting make its study a must to include in both architecture and architectural engineering curricula. In this paper, the author shares his experience teaching undergraduate students the principles of the design of daylighting systems; implementing laboratory-oriented studies as the educational tool. The paper starts with a brief survey of the existing design-assisting tools, discusses three advanced design methodologies, which are computer programs, outdoor model testing, and indoor model testing, and...
Indeed, design of daylighting systems is increasingly becoming an integral part of the design of ... more Indeed, design of daylighting systems is increasingly becoming an integral part of the design of energy-efficient buildings. In order to accurately design, test, and analyze daylighting systems, a controlled luminous environment is required to simulate different sky conditions, under which a physical model can be tested. An artificial sky dome is needed. This paper reports on the ongoing effort to build an Artificial Sky Dome for the School of Architecture at Oklahoma State University. The paper discusses the technical challenges faced by the team in charge of designing the Artificial Sky Dome. Challenges that relate to the structure of the dome, uniform distribution of light sources, avoiding the star effect, effect of internal reflections, models of different sky conditions, control of sky luminance, and the need for a post-construction calibration of the lighting control system. The construction of the Artificial Sky Dome is expected to be completed by the end of summer 2005. Thi...
Thesis (Ph. D.)--Illinois Institute of Technology, 2001. Includes bibliographical references (lea... more Thesis (Ph. D.)--Illinois Institute of Technology, 2001. Includes bibliographical references (leaves 186-192).
Conventional wisdom holds that carefully designed exterior louver systems tuned to a building'... more Conventional wisdom holds that carefully designed exterior louver systems tuned to a building's earth latitude and its glass wall's compass orientations do a better job of regulating sunlight than interior louver systems due to the intuition-friendly observation that exterior systems reflect or shade the sunlight before it ever enters the building. A multi-criteria, multi-variable analysis performed on a 3600 SF multipurpose space came to different conclusions. The results showed that when accounting for such design criteria as carbon footprint, glare, optimal daylighting and solar heat gain of the interior, tuned exterior louvers perform well against some measures but fared poorly in others, making the decision between types of louver systems a matter of setting performance priorities and aesthetic preference in any given building. This paper summarizes a student's independent research study in which she tested her studio project's arrangement of sun louvers in a la...
Carbon impact estimation software programs have simplified the processes for evaluating the carbo... more Carbon impact estimation software programs have simplified the processes for evaluating the carbon contribution of proposed buildings and can be relatively accurate down to building assembly. However, the simplifying assumption that a building's embodied carbon is entirely a function of the production and installation, while a building's carbon-in-use is the province of a building's operational life can lead to misleading results, and hence, faulty decisions, when the lifespans of a building's individual materials differ greatly from the building's lifespan. The primary study became a way to point out those disparities between material life expectancy and carbon impact by studying the impact of three alternative roof assemblies.
This paper reports on an experimental study that investigated the impact of clear and diffusing g... more This paper reports on an experimental study that investigated the impact of clear and diffusing glass types on the design and performance of daylighting systems. Scale models of toplighting and sidelighting systems were tested in the lab under the standard CIE overcast sky. Quantitative analysis of the test results documented, with a good level of accuracy, the impact of different glass types on the overall efficiency of daylighting systems, and showed their impact on the distribution of light intensities inside the spaces tested. The findings and recommendations of this study should be helpful to architects and engineers who do design (or engineer) daylighting systems
This paper addresses a timely topic, which is designing and enhancing the performance of daylight... more This paper addresses a timely topic, which is designing and enhancing the performance of daylighting systems in buildings early in the design phase. Currently in academia, the design of daylighting systems lacks the emphasis, rigor, and time normally given to electric lighting systems. However, only in a few higher education institutions, more attention is being gradually given to the study of daylighting systems. Undoubtedly, the substantial environmental and economic benefits of daylighting make its study a must to include in both architecture and architectural engineering curricula. In this paper, the author shares his experience teaching undergraduate students the principles of the design of daylighting systems; implementing laboratory-oriented studies as the educational tool. The paper starts with a brief survey of the existing design-assisting tools, discusses three advanced design methodologies, which are computer programs, outdoor model testing, and indoor model testing, and...
Indeed, design of daylighting systems is increasingly becoming an integral part of the design of ... more Indeed, design of daylighting systems is increasingly becoming an integral part of the design of energy-efficient buildings. In order to accurately design, test, and analyze daylighting systems, a controlled luminous environment is required to simulate different sky conditions, under which a physical model can be tested. An artificial sky dome is needed. This paper reports on the ongoing effort to build an Artificial Sky Dome for the School of Architecture at Oklahoma State University. The paper discusses the technical challenges faced by the team in charge of designing the Artificial Sky Dome. Challenges that relate to the structure of the dome, uniform distribution of light sources, avoiding the star effect, effect of internal reflections, models of different sky conditions, control of sky luminance, and the need for a post-construction calibration of the lighting control system. The construction of the Artificial Sky Dome is expected to be completed by the end of summer 2005. Thi...
Thesis (Ph. D.)--Illinois Institute of Technology, 2001. Includes bibliographical references (lea... more Thesis (Ph. D.)--Illinois Institute of Technology, 2001. Includes bibliographical references (leaves 186-192).
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