Mixed-mode office buildings: energy savings and illuminance levels in a high-altitude tropical climate
Mixed-mode buildings (MM), which use both natural ventilation and mechanical cooling to provide thermal comfort and energy savings, have a high potential in climates where it is favorable to use natural ventilation (e.g., Brazil). In these buildings, operable windows are the source of natural ventil...
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| Κύριοι συγγραφείς: | , , |
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| Μορφή: | Online |
| Γλώσσα: | eng |
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Universidade Estadual de Campinas
2019
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| Διαθέσιμο Online: | https://periodicos.sbu.unicamp.br/ojs/index.php/parc/article/view/8653027 |
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| id |
oai:ojs.periodicos.sbu.unicamp.br:article-8653027 |
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| record_format |
ojs |
| institution |
Universidade Estadual de Campinas |
| collection |
OJS |
| language |
eng |
| format |
Online |
| author |
Brugnera, Rosilene Regolão Santesso, Caroline Antonelli Chvatal, Karin Maria Soares |
| spellingShingle |
Brugnera, Rosilene Regolão Santesso, Caroline Antonelli Chvatal, Karin Maria Soares Mixed-mode office buildings: energy savings and illuminance levels in a high-altitude tropical climate |
| author_facet |
Brugnera, Rosilene Regolão Santesso, Caroline Antonelli Chvatal, Karin Maria Soares |
| author_sort |
Brugnera, Rosilene Regolão |
| title |
Mixed-mode office buildings: energy savings and illuminance levels in a high-altitude tropical climate |
| title_short |
Mixed-mode office buildings: energy savings and illuminance levels in a high-altitude tropical climate |
| title_full |
Mixed-mode office buildings: energy savings and illuminance levels in a high-altitude tropical climate |
| title_fullStr |
Mixed-mode office buildings: energy savings and illuminance levels in a high-altitude tropical climate |
| title_full_unstemmed |
Mixed-mode office buildings: energy savings and illuminance levels in a high-altitude tropical climate |
| title_sort |
mixed-mode office buildings: energy savings and illuminance levels in a high-altitude tropical climate |
| description |
Mixed-mode buildings (MM), which use both natural ventilation and mechanical cooling to provide thermal comfort and energy savings, have a high potential in climates where it is favorable to use natural ventilation (e.g., Brazil). In these buildings, operable windows are the source of natural ventilation, lighting and heat gains, and their characteristics can influence energy consumption. This work aims to evaluate the energy and luminous performance of mixed-mode office buildings with operable windows in a high-altitude tropical climate in Brazil. The performance is evaluated concerning energy savings, air-conditioning operation hours, the period of use of natural ventilation and balance between energy demand and illuminance levels. It is considered variations in envelope parameters (window-to-wall ratio and solar orientation). The method is composed of computer simulations on Daysim and EnergyPlus programs. The results showed that the mixed-mode strategy has great potential to reduce air-conditioning energy consumption. The most significant reductions occurred with larger WWRs, reaching 39.4% of energy savings (north facade, WWR = 80%). Nevertheless, while the larger WWR provided more natural ventilation availability, it increased the discomfort by high illuminance, which reached about 90% of the office’s area. Therefore, when the mixed-mode system was used, the cases with a better balance between adequate illuminance levels and low energy consumption were the south facade with all WWRs and the east and west facades with WWR of 30%. It is important to emphasize that the adoption of these solutions depends on the building's design requirements. |
| publisher |
Universidade Estadual de Campinas |
| publishDate |
2019 |
| url |
https://periodicos.sbu.unicamp.br/ojs/index.php/parc/article/view/8653027 |
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| spelling |
oai:ojs.periodicos.sbu.unicamp.br:article-86530272020-03-13T17:53:51Z Mixed-mode office buildings: energy savings and illuminance levels in a high-altitude tropical climate Edifícios de escritórios de modo misto: economia de energia e níveis adequados de iluminância em um clima tropical de altitude Brugnera, Rosilene Regolão Santesso, Caroline Antonelli Chvatal, Karin Maria Soares Mixed-mode buildings Hybrid ventilation Energy consumption Visual comfort Hilgh-altitude tropical climate. Edifício de modo-misto Ventilação híbrida Consumo energético Conforto visual Clima tropical de altitude. Mixed-mode buildings (MM), which use both natural ventilation and mechanical cooling to provide thermal comfort and energy savings, have a high potential in climates where it is favorable to use natural ventilation (e.g., Brazil). In these buildings, operable windows are the source of natural ventilation, lighting and heat gains, and their characteristics can influence energy consumption. This work aims to evaluate the energy and luminous performance of mixed-mode office buildings with operable windows in a high-altitude tropical climate in Brazil. The performance is evaluated concerning energy savings, air-conditioning operation hours, the period of use of natural ventilation and balance between energy demand and illuminance levels. It is considered variations in envelope parameters (window-to-wall ratio and solar orientation). The method is composed of computer simulations on Daysim and EnergyPlus programs. The results showed that the mixed-mode strategy has great potential to reduce air-conditioning energy consumption. The most significant reductions occurred with larger WWRs, reaching 39.4% of energy savings (north facade, WWR = 80%). Nevertheless, while the larger WWR provided more natural ventilation availability, it increased the discomfort by high illuminance, which reached about 90% of the office’s area. Therefore, when the mixed-mode system was used, the cases with a better balance between adequate illuminance levels and low energy consumption were the south facade with all WWRs and the east and west facades with WWR of 30%. It is important to emphasize that the adoption of these solutions depends on the building's design requirements. Edifícios de modo misto (MM), os quais usam ventilação natural e resfriamento mecânico para proporcionar conforto térmico e economia de energia, tem um grande potencial em climas onde o uso da ventilação natural é favorável (ex. Brasil). Nesses edifícios, as janelas operáveis são fontes tanto de ventilação natural quanto iluminação e ganhos internos, e suas características podem influenciar no consumo de energia. Este trabalho tem como objetivo avaliar o desempenho energético e luminoso de edifícios de modo-misto com janelas operáveis em um clima tropical de altitude no Brasil. Considerando variações nos parâmetros do envelope (percentual de abertura na fachada e orientação solar), o desempenho é avaliado em relação à economia de energia, tempo de uso do ar condicionado, período de utilização da ventilação natural e o balanço entre a demanda de energia e os níveis de iluminância. O método é composto por simulações computacionais nos programas Daysim e EnergyPlus. Os resultados mostraram que a estratégia de modo-misto tem um grande potencial para reduzir o consumo do ar condicionado. As grandes reduções ocorreram nos maiores PAFs, atingindo 39,4% de economia de energia (fachada norte, PAF = 80%). Apesar disso, enquanto o maior PAF forneceu maior disponibilidade de ventilação natural, aumentou o desconforto devido a elevadas iluminâncias, atingindo cerca de 90% da área do escritório. Portanto, quando o modo misto foi usado, os casos com melhor equilíbrio entre níveis adequados de iluminância e baixo consumo de energia foram a fachada sul com todos os PAFs e as fachadas leste e oeste com PAF de 30%. É importante ressaltar que a adoção destas soluções depende dos requisitos de projeto do edifício. Universidade Estadual de Campinas 2019-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Case study; Experimental research (computer simulation) Estudo de caso; Pesquisa experimental (simulação computacional) application/pdf https://periodicos.sbu.unicamp.br/ojs/index.php/parc/article/view/8653027 10.20396/parc.v10i0.8653027 PARC Pesquisa em Arquitetura e Construção; Vol. 10 (2019): Continuous publication; e019016 PARC Pesquisa em Arquitetura e Construção; Vol. 10 (2019): Publicação contínua; e019016 PARC Pesquisa em Arquitetura e Construção; v. 10 (2019): Publicação contínua; e019016 1980-6809 eng https://periodicos.sbu.unicamp.br/ojs/index.php/parc/article/view/8653027/19388 Brazil; Contemporary Brasil; Contemporâneo Copyright (c) 2019 PARC Pesquisa em Arquitetura e Construção |