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Numerical Evaluation of Ventilation Efficiency of Window Type Ventilation SystemsNumerical Evaluation of Ventilation Efficiency of Window Type Ventilation Systems

Authors
Yang, Young KwonKim, Min YoungMoon, Jin WooPark, Jin Chul
Issue Date
Sep-2019
Publisher
World Scientific Publishing Co. Pte Ltd
Keywords
computational fluid dynamics; louver; ventilation; Window ventilation system
Citation
International Journal of Air-Conditioning and Refrigeration, v.27, no.3, pp 1 - 13
Pages
13
Journal Title
International Journal of Air-Conditioning and Refrigeration
Volume
27
Number
3
Start Page
1
End Page
13
URI
https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/36896
DOI
10.1142/S2010132519500275
ISSN
2010-1325
2010-1333
Abstract
Ventilation in buildings is the simplest and most convenient way to purify indoor air. However, when the ventilation is not enough due to natural ventilation, it should be cleaned by mechanical ventilation or air purifier. This process requires building energy. Therefore, it is possible to save the energy of the building by merely increasing the natural ventilation efficiency. This study conducted airflow analysis simulations to investigate the effects of changes in the shape of ventilation openings and louvers on the ventilation efficiency of a window ventilation system. The streamlined window opening exhibited a greater increase in airflow (41.3%) than did the conventional window (24.3%) for the ventilation model with four openings. It was also observed that flow separation and wakes were generated by the adverse pressure gradient arising from the increased airflow speed when a louver was employed. Based on these results, it can be concluded that using a louver as a wind augmentation device is an obstacle to improving the airflow in a window ventilation system. © 2019 World Scientific Publishing Company.
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