Thesis (Ph. D.)--University of Michigan, 1962. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (v. 1, leaves 174-187).

Thesis--Erlangen, 1927. / Vita. Includes bibliographical references (p. [4]).

The latter half of the 20th century saw the development of lightweight tensioned translucent membranes as shading devices and their increasing use in providing daylight and daylight control. Buildings with high lighting consumption and long operation hours in particular are including translucent membranes in their daylighting strategies. For this reason, the use of reliable tools for the prediction of the lighting environment experienced in daylit spaces, which exploit translucent membranes, has become essential. To date most analytic efforts related to predicting daylighting performance has concentrated on the analysis of light penetration through glass openings. Little attention has been paid to the light transmission through fabric membranes. The membranes itself are normally in tensioned creating double curvature shapes. The simulation of light transmitted through membranes involves the modelling of complex geometries, which places significant demand to their modelling. This thesis explores the daylighting performance of sports buildings that include translucent membranes as part of their daylighting strategy. Performance of these buildings has been assessed by field illuminance measurements, physical scale modelling in artificial sky and three-dimensional modelling using Radiance software. The accuracy of the simulation tools is assessed against the lighting data recorded in the field study. Findings show that physical scale models tend to overestimate the illuminance levels and daylight factors of the sports halls. On the other hand, Radiance simulations proved to be accurate in terms of daylight factors and illuminance distribution in the playing areas. Finally, a questionnaire has been distributed among the occupants of the three case study buildings and one totally artificially illuminated sports centre. The purpose of this survey is to evaluate the users satisfaction towards the lighting environment of the enclosures. The ability to accurately predict the daylighting performance in membrane sports buildings is significant for the development of research in daylighting and sustainable architecture. In addition, the further use of translucent membranes for the control of natural light in all type of buildings relies on the possibility to confidently predict their daylighting performance.

We are now facing the challenge of sustainable development. This thesis focuses on the building illumination of one downtown hospitality building, the Renaissance Vancouver Hotel (RVH), to demonstrate three options for sustainable development of architectural lighting. The thesis employs architectural exterior lighting based on the technology of light emitting diodes (LEDs) as a vehicle to demonstrate how to reduce the energy consumption and maintenance costs of decorative lighting on building façades via three transformative lighting strategies. These three transformative lighting strategies demonstrate three possibilities of applying LEDs to develop architectural creativity and energy sustainability for an outdoor decorative lighting system. The first transformation utilizes LEDs for the retrofit of existing compact fluorescent lights (CFLs) on the RVH’s façades and rooftop, in order to improve and diversify the building’s illumination in a sustainable manner. The second transformation optimizes the yearly programming of the new outdoor decorative LED lighting in accordance with differing seasonal and temporal themes in order to save energy, demonstrate architectural creativity via versatile lighting patterns, and systematically manage the unstable generation of renewable energy. The third transformation explores the potential of on-site electricity generation in an urban context instead of its purchase from BC Hydro. Photovoltaic (PV) panels will generate the electrical requirements of the RVH’s decorative exterior LED lighting. This transformation will transfer daytime solar energy to electricity for night outdoor building illumination; consequently, it can encourage outdoor activities in the nighttime for Vancouverites, and is a means of compensating for the limited daytime hours in Vancouver’s winter months.

Radiosity is a global illumination algorithm used by artists, architects, and engineers for its realistic simulation of lighting. Since the illumination model is global, complexity and run time grow as larger environments are provided. Algorithms exist which generate an incremental result and provide weighting based on the user's view of the environment. This thesis introduces an algorithm for directing and focusing radiosity calculations relative to the user's point-of-view and within the user's field-of-view, generating visually interesting results for a localized area more quickly than a traditional global approach. The algorithm, referred to as perspective-driven radiosity, is an extension of the importance-driven radiosity algorithm, which itself is an extension of the progressive refinement radiosity algorithm. The software implemented during research into the point-of-view/field-of-view-driven algorithm can demonstrate both of these algorithms, and can generate results for arbitrary geometry. Parameters can be adjusted by the user to provide results that favor speed or quality. To take advantage of the scalability of programmable graphics hardware, the algorithm is implemented as an extension of progressive refinement radiosity on the GPU, using OpenGL and GLSL. Results from each of the three implemented radiosity algorithms are compared using a variety of geometry.

Thesis (doctoral)--Basel, 1946. / "Sonderdruck aus: Die Buchmalerei des 16. Jahrhunderts in der Schweiz." Vita. Includes bibliographical references.

We are now facing the challenge of sustainable development. This thesis focuses on the building illumination of one downtown hospitality building, the Renaissance Vancouver Hotel (RVH), to demonstrate three options for sustainable development of architectural lighting. The thesis employs architectural exterior lighting based on the technology of light emitting diodes (LEDs) as a vehicle to demonstrate how to reduce the energy consumption and maintenance costs of decorative lighting on building façades via three transformative lighting strategies. These three transformative lighting strategies demonstrate three possibilities of applying LEDs to develop architectural creativity and energy sustainability for an outdoor decorative lighting system. The first transformation utilizes LEDs for the retrofit of existing compact fluorescent lights (CFLs) on the RVH’s façades and rooftop, in order to improve and diversify the building’s illumination in a sustainable manner. The second transformation optimizes the yearly programming of the new outdoor decorative LED lighting in accordance with differing seasonal and temporal themes in order to save energy, demonstrate architectural creativity via versatile lighting patterns, and systematically manage the unstable generation of renewable energy. The third transformation explores the potential of on-site electricity generation in an urban context instead of its purchase from BC Hydro. Photovoltaic (PV) panels will generate the electrical requirements of the RVH’s decorative exterior LED lighting. This transformation will transfer daytime solar energy to electricity for night outdoor building illumination; consequently, it can encourage outdoor activities in the nighttime for Vancouverites, and is a means of compensating for the limited daytime hours in Vancouver’s winter months.

The reduction of fossil fuel consumption and the associated decrease in greenhouse gas emissions are vital to combat global warming and this can be accomplished, in part, by the use of natural light to provide illumination in buildings. Demand for artificial lighting and the availability of daylight often correspond, so savings can be significant. To assess the performance of several innovative daylighting devices and to develop improved models for more established technology, quantitative measurement of output was necessary. This was achieved by the development of simply constructed photometric integrators which were calibrated by the innovative use of daylight as a source of illuminance. These devices were found to be consistent and accurate in measuring the luminous flux from a number of devices and in a number of locations. The novel light rod was assessed as a core daylighting technology and found to transmit light with high efficiency at aspect ratios of up to 40. It was found to have higher transmittance than the light pipe and with a considerably smaller diameter, could be used in space-restricted applications. Light rods were bent by infra-red heating and found to lose minimal transmittance. The light rod emitter was modified to give a variety of types of light distribution, including side emission and the results were visually and quantitatively assessed. Energy saving capacity was assessed and a model of performance developed for the first time. The long-term measurement of light pipe performance and measurement of length and diameter effects led to several improved models of performance for European latitudes. Several means of improving yield were investigated, including novel cone concentrators, laser cut panels and innovative high-efficiency reflective films. The concentrators and films were found to give significantly higher output than a standard light pipe, increasing energy savings and associated benefits for the user.

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Thesis (doctoral)--Basel, 1946. / "Sonderdruck aus: Die Buchmalerei des 16. Jahrhunderts in der Schweiz." Vita. Includes bibliographical references.