Natural ventilation for office building retrofit in dense urban context under hot and humid climate
Recent studies underline that simple and non-invasive retrofit solutions can recover natural ventilation potential in existing buildings under temperate climate. Nonetheless, the efficiency of these solutions in dense urban contexts under hot and humid climate remains unclear. This paper aims to eva...
Kaydedildi:
| Asıl Yazarlar: | , , |
|---|---|
| Materyal Türü: | Online |
| Dil: | eng |
| Baskı/Yayın Bilgisi: |
ANTAC - Associação Nacional de Tecnologia do Ambiente Construído
2021
|
| Online Erişim: | https://seer.ufrgs.br/ambienteconstruido/article/view/103510 |
| Etiketler: |
Etiketle
Etiket eklenmemiş, İlk siz ekleyin!
|
| id |
ojs-article-103510 |
|---|---|
| record_format |
ojs |
| spelling |
ojs-article-1035102021-03-12T21:59:21Z Natural ventilation for office building retrofit in dense urban context under hot and humid climate Fontenelle, Marilia Ramalho Bastos, Leopoldo Eurico Gonçalves Lorente, Sylvie natural ventilation; urban canyon; thermal comfort; retrofit; adaptive thermal comfort Recent studies underline that simple and non-invasive retrofit solutions can recover natural ventilation potential in existing buildings under temperate climate. Nonetheless, the efficiency of these solutions in dense urban contexts under hot and humid climate remains unclear. This paper aims to evaluate the thermal comfort gains caused by natural ventilation when retrofitting an office building in downtown Rio de Janeiro. Computational Fluid Dynamics (CFD) and thermal simulations are carried out on Ansys CFX and Designbuilder to assess indoor air flow before and after retrofit. The diagnosis of the current scenario indicates that the surrounding buildings block a significant part of the wind flow, and occupants experience only a few hours of thermal comfort during the year, especially on lower floors. To increase indoor air flow, the fixed upper windows were transformed into pivot windows and kept open permanently. This measure increases the annual hours of thermal comfort by 0.5-35%, depending on the floor and the adaptive comfort model. These findings suggest that natural ventilation itself may not be sufficient to ensure occupants' comfort throughout the year under the investigated context. ANTAC - Associação Nacional de Tecnologia do Ambiente Construído CAPES, FAPERJ 2021-03-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://seer.ufrgs.br/ambienteconstruido/article/view/103510 Ambiente Construído; v. 21, n. 2 (2021); 67-97 Ambiente Construído; v. 21, n. 2 (2021); 67-97 Ambiente Construído; v. 21, n. 2 (2021); 67-97 1678-8621 1415-8876 eng https://seer.ufrgs.br/ambienteconstruido/article/view/103510/60989 Direitos autorais 2021 Ambiente Construído https://creativecommons.org/licenses/by/4.0 |
| institution |
Universidade Federal do Rio Grande do Sul |
| collection |
OJS |
| language |
eng |
| format |
Online |
| author |
Fontenelle, Marilia Ramalho Bastos, Leopoldo Eurico Gonçalves Lorente, Sylvie |
| spellingShingle |
Fontenelle, Marilia Ramalho Bastos, Leopoldo Eurico Gonçalves Lorente, Sylvie Natural ventilation for office building retrofit in dense urban context under hot and humid climate |
| author_facet |
Fontenelle, Marilia Ramalho Bastos, Leopoldo Eurico Gonçalves Lorente, Sylvie |
| author_sort |
Fontenelle, Marilia Ramalho |
| title |
Natural ventilation for office building retrofit in dense urban context under hot and humid climate |
| title_short |
Natural ventilation for office building retrofit in dense urban context under hot and humid climate |
| title_full |
Natural ventilation for office building retrofit in dense urban context under hot and humid climate |
| title_fullStr |
Natural ventilation for office building retrofit in dense urban context under hot and humid climate |
| title_full_unstemmed |
Natural ventilation for office building retrofit in dense urban context under hot and humid climate |
| title_sort |
natural ventilation for office building retrofit in dense urban context under hot and humid climate |
| description |
Recent studies underline that simple and non-invasive retrofit solutions can recover natural ventilation potential in existing buildings under temperate climate. Nonetheless, the efficiency of these solutions in dense urban contexts under hot and humid climate remains unclear. This paper aims to evaluate the thermal comfort gains caused by natural ventilation when retrofitting an office building in downtown Rio de Janeiro. Computational Fluid Dynamics (CFD) and thermal simulations are carried out on Ansys CFX and Designbuilder to assess indoor air flow before and after retrofit. The diagnosis of the current scenario indicates that the surrounding buildings block a significant part of the wind flow, and occupants experience only a few hours of thermal comfort during the year, especially on lower floors. To increase indoor air flow, the fixed upper windows were transformed into pivot windows and kept open permanently. This measure increases the annual hours of thermal comfort by 0.5-35%, depending on the floor and the adaptive comfort model. These findings suggest that natural ventilation itself may not be sufficient to ensure occupants' comfort throughout the year under the investigated context. |
| publisher |
ANTAC - Associação Nacional de Tecnologia do Ambiente Construído |
| publishDate |
2021 |
| url |
https://seer.ufrgs.br/ambienteconstruido/article/view/103510 |
| work_keys_str_mv |
AT fontenellemariliaramalho naturalventilationforofficebuildingretrofitindenseurbancontextunderhotandhumidclimate AT bastosleopoldoeuricogoncalves naturalventilationforofficebuildingretrofitindenseurbancontextunderhotandhumidclimate AT lorentesylvie naturalventilationforofficebuildingretrofitindenseurbancontextunderhotandhumidclimate |
| _version_ |
1709370534177800192 |