Influence and optimization of building opening configurations on the performance of enhanced roof ventilation units (ERU): a numerical and orthogonal study
Enhanced roof ventilation units (ERU) can significantly enhance indoor airflow and thermal comfort, but their effectiveness is influenced by building opening configurations. Therefore, the performance of ERU under different building opening factors (window height (A), window size (B), door size (C),...
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Elsevier
2025-02-01
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| Series: | Case Studies in Thermal Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X25000139 |
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| author | Lei Tian Zu-An Liu You Li Jiawen Hou Yuling Xiao Fan Fei Yueqiu Xia Wanxiang Yao Hiroatsu Fukuda |
| author_facet | Lei Tian Zu-An Liu You Li Jiawen Hou Yuling Xiao Fan Fei Yueqiu Xia Wanxiang Yao Hiroatsu Fukuda |
| author_sort | Lei Tian |
| collection | DOAJ |
| description | Enhanced roof ventilation units (ERU) can significantly enhance indoor airflow and thermal comfort, but their effectiveness is influenced by building opening configurations. Therefore, the performance of ERU under different building opening factors (window height (A), window size (B), door size (C), window orientation (D), door orientation (G), and building orientation (O)) was explored through numerical simulations and orthogonal design. Meanwhile, these factors influence laws, degrees, significance levels, and optimal schemes were identified. The findings reveal that: (1) For volume flow rate, the influence ranking is O > C > B > D > G > A, while for outlet average air age and volume air age, the rankings are O > G > A > D > C > B and O > A > G > C > D > B; (2) The indoor combinatorial ventilation efficiency under optimal configuration is 9.75 %, the flow purification rate and air exchange efficiency are 20.21 % and 48.27 %; (3) The percentage dissatisfied (PDT and PDD) under optimal configuration are 0.31 %; (4) Local vortices can lead to poor ventilation performance, but indoor circulation can bring the air exchange efficiency approaching the ideal 50 %. (5) The opening configurations focus on building orientation and dominant wind direction. (6) Appropriate opening configurations are more conducive to ventilation than increasing the area openings. This research provides valuable insights for optimizing roof ventilation units and improving indoor thermal comfort. |
| format | Article |
| id | doaj-art-e0d5dc51c43a44b09853f53c857b3a95 |
| institution | Kabale University |
| issn | 2214-157X |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-e0d5dc51c43a44b09853f53c857b3a952025-02-02T05:27:21ZengElsevierCase Studies in Thermal Engineering2214-157X2025-02-0166105753Influence and optimization of building opening configurations on the performance of enhanced roof ventilation units (ERU): a numerical and orthogonal studyLei Tian0Zu-An Liu1You Li2Jiawen Hou3Yuling Xiao4Fan Fei5Yueqiu Xia6Wanxiang Yao7Hiroatsu Fukuda8School of Civil Engineering, Xuzhou University of Technology, Xuzhou, 221018, China; Faculty of Environmental Engineering, The University of Kitakyushu, Kitakyushu, 808-0135, JapanSchool of Civil Engineering, Xuzhou University of Technology, Xuzhou, 221018, China; Corresponding author.Asia-Japan Research Institute, Ritsumeikan University, Ibaraki, 567-8570, JapanSchool of Civil Engineering, Xuzhou University of Technology, Xuzhou, 221018, China; Corresponding author.Faculty of Environmental Engineering, The University of Kitakyushu, Kitakyushu, 808-0135, JapanFaculty of Environmental Engineering, The University of Kitakyushu, Kitakyushu, 808-0135, JapanFaculty of Environmental Engineering, The University of Kitakyushu, Kitakyushu, 808-0135, JapanFaculty of Environmental Engineering, The University of Kitakyushu, Kitakyushu, 808-0135, Japan; iSMART, Qingdao University of Technology, Qingdao, 266033, ChinaFaculty of Environmental Engineering, The University of Kitakyushu, Kitakyushu, 808-0135, JapanEnhanced roof ventilation units (ERU) can significantly enhance indoor airflow and thermal comfort, but their effectiveness is influenced by building opening configurations. Therefore, the performance of ERU under different building opening factors (window height (A), window size (B), door size (C), window orientation (D), door orientation (G), and building orientation (O)) was explored through numerical simulations and orthogonal design. Meanwhile, these factors influence laws, degrees, significance levels, and optimal schemes were identified. The findings reveal that: (1) For volume flow rate, the influence ranking is O > C > B > D > G > A, while for outlet average air age and volume air age, the rankings are O > G > A > D > C > B and O > A > G > C > D > B; (2) The indoor combinatorial ventilation efficiency under optimal configuration is 9.75 %, the flow purification rate and air exchange efficiency are 20.21 % and 48.27 %; (3) The percentage dissatisfied (PDT and PDD) under optimal configuration are 0.31 %; (4) Local vortices can lead to poor ventilation performance, but indoor circulation can bring the air exchange efficiency approaching the ideal 50 %. (5) The opening configurations focus on building orientation and dominant wind direction. (6) Appropriate opening configurations are more conducive to ventilation than increasing the area openings. This research provides valuable insights for optimizing roof ventilation units and improving indoor thermal comfort.http://www.sciencedirect.com/science/article/pii/S2214157X25000139Enhanced roof ventilation unit (ERU)Building opening configurationOrthogonal designNumerical simulationVentilation effect |
| spellingShingle | Lei Tian Zu-An Liu You Li Jiawen Hou Yuling Xiao Fan Fei Yueqiu Xia Wanxiang Yao Hiroatsu Fukuda Influence and optimization of building opening configurations on the performance of enhanced roof ventilation units (ERU): a numerical and orthogonal study Case Studies in Thermal Engineering Enhanced roof ventilation unit (ERU) Building opening configuration Orthogonal design Numerical simulation Ventilation effect |
| title | Influence and optimization of building opening configurations on the performance of enhanced roof ventilation units (ERU): a numerical and orthogonal study |
| title_full | Influence and optimization of building opening configurations on the performance of enhanced roof ventilation units (ERU): a numerical and orthogonal study |
| title_fullStr | Influence and optimization of building opening configurations on the performance of enhanced roof ventilation units (ERU): a numerical and orthogonal study |
| title_full_unstemmed | Influence and optimization of building opening configurations on the performance of enhanced roof ventilation units (ERU): a numerical and orthogonal study |
| title_short | Influence and optimization of building opening configurations on the performance of enhanced roof ventilation units (ERU): a numerical and orthogonal study |
| title_sort | influence and optimization of building opening configurations on the performance of enhanced roof ventilation units eru a numerical and orthogonal study |
| topic | Enhanced roof ventilation unit (ERU) Building opening configuration Orthogonal design Numerical simulation Ventilation effect |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X25000139 |
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