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Silva, F. C. et al. Luminous performance of direct sunlighting systems in classrooms. In: CONFERENCE ON PASSIVE AND LOW ENERGY ARCHITECTURE, 20., 2003, Santiago do Chile. Anais... Santiago do Chile, 2003.
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Abstract

The objective of this on-going research is to develop natural lighting systems with the best achievable geometry comprised of light-shelves, skylights, reflective surfaces and finish materials, to redirect sunlight more deeply and for longer periods into classroom environments in existing buildings at the Federal University of Uberlandia, while simultaneously shading areas close to windows and under roof openings against excessive direct solar incidence. The construction elements will have to be durable, be relatively easy to manufacture repeatably at a low cost, and possess adaptive flexibility to several existing situations. A parallel purpose to comfortable environments is to obtain electric energy conservation, thus monitoring of light levels, temperature and humidity, and electric light usage was done prior to prototype implementation and is still underway to obtain full year-round performance data. All proposed prototype designs were tested in computer lighting simulator applications such as Radiance and using a model at 1 /10 scale in field measurements under clear sky, on a solar azimuth and solar altitude angle-adaptive platform specially designed to act as a heliodon. In the model, interior light levels were measured using Li-Cor photometric sensors linked to a data logger, and overall room appearance was photographed. All acquired data was compared to mathematical and virtual image results obtained with the simulators. At this stage, one selected prototype design was refined for construction, evaluating structural strength, efficient water shedding and ease of maintenance, among other considerations. During the development of prototype design, room environmental conditions were monitored. Full-scale prototypes were then built and installed, and POE monitoring was begun. The experience gained is being applied to project development and implem entation of energy-efficient retrofitting of the university infrastructure and to continuing education for design professionals.
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