Simulação de desempenho luminoso para salas de aula em Natal-RN
The city of Natal has a significant daylight availability, although it use isn’t systematically explored in schools architecture. In this context, this research aims to determine procedures for the analysis of the daylight performance in school design in Natal-RN. The method of analysis is divide...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/19678 |
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| Resumo: | The city of Natal has a significant daylight availability, although it use isn’t systematically
explored in schools architecture. In this context, this research aims to determine procedures
for the analysis of the daylight performance in school design in Natal-RN. The method of
analysis is divided in Visible Sky Factor (VSF), simulating and analyzing the results. The
annual variation of the daylight behavior requires the adoption of dynamic simulation as data
procedure. The classrooms were modelled in SketchUp, simulated in Daysim program and the
results were assessed by means of spreadsheets in Microsoft Excel. The classrooms
dimensions are 7.20mx 7.20m, with windows-to-wall-ratio (WWR) of 20%, 40% and 50%, and
with different shading devices, such as standard horizontal overhang, sloped overhang,
standard horizontal overhang with side view protection, standard horizontal overhang with a
dropped edge, standard horizontal overhang with three horizontal louvers, double standard
horizontal overhang, double standard horizontal overhang with three horizontal louvers, plus
the use of shelf light in half the models with WWR of 40% and 50%. The data was organized
in spreadsheets, with two intervals of UDI: between 300lux and 2000 lux and between 300lux
and 3000lux. The simulation was performed with the weather file of 2009 to the city of NatalRN.
The graphical outputs are illuminance curves, isolines of UDI among 300lux and 2000 lux
and tables with index of occurrences of glare and to an UDI among 300lux 3000lux. The best
UDI300-2000lux performance was evidenced to: Phase 1 (models with WWR of 20%), Phase 2
(models with WWR of 40% and 50% with light shelf). The best UDI300-3000lux performance was
evidenced to: Phase 1 (models with WWR of 20% and 40% with light shelf) and Phase 2
(models with WWR of 40% and 50% with light shelf). The outputs prove that the daylight quality
mainly depends on the shading system efficacy to avoid the glare occurrence, which
determines the daylight discomfort. The bioclimatic recommendations of big openings with
partial shading (with an opening with direct sunlight) resulted in illuminances level higher than
the acceptable upper threshold. The improvement of the shading system percentage (from
73% to 91%) in medium-size of openings (WWR 40% and 50%) reduced or eliminate the glare
occurrence without compromising the daylight zone depth (7.20m). The passive zone was
determined for classrooms with satisfactory daylight performance, it was calculated the
daylight zone depth rule-of-thumb with the ratio between daylight zone depth and the height of
the window for different size of openings. The ratio ranged from 1.54 to 2.57 for WWR of 20%,
40% and 50% respectively. There was a reduction or elimination of glare in the passive area
with light shelf, or with awning window shading. |
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