Journal
BUILDING AND ENVIRONMENT
Volume 44, Issue 9, Pages 1970-1979Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.buildenv.2009.01.013
Keywords
Buoyancy-driven ventilation; CFD simulation; Reduced-scale air model; Turbulence model
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This research focuses on developing a reliable methodology for predicting the performance of buoyancy-driven ventilation in atrium buildings during the design stage using both computational fluid dynamics (CFD) and scale model tests. The results show several features. First, the agreement between CFD simulation and measurement results in the heated zone is better with rng k-epsilon and zero-equation turbulent schemes; whereas, in the atrium space, the laminar and zero-equation CFD models provide better results. Second, the external ambient temperature has a larger effect on the temperature distribution in the atrium space than the thermal load inside the building. Third, the position of the stack openings that create a direct ventilation path can improve the internal thermal environment. The size of the stack openings also affects the temperature distribution in the atrium space. Lastly, due to the small temperature difference in hot and humid climates, a buoyancy-only ventilation strategy is not very effective in such a situation. That is, when a low-rise atrium building is situated in a hot and humid environment, additional efforts such as wind-driven ventilation, wind-buoyancy ventilation or mechanically driven ventilation will be necessary to achieve the thermal comfort desired. (C) 2009 Elsevier Ltd. All rights reserved.
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