Study on the Nature Ventilation Performance of the Dynamic Ventilation Shaft within a Low-Carbon House

• Main Authors: Ping-Lung Yu, 余品龍
• Other Authors: Yu-Pei Ke
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/67988224078490827910

碩士 === 國立高雄第一科技大學 === 營建工程研究所 === 99 === Taiwan is in the subtropical regions, resulting in hot and humid indoor environment. This study was conducted on a low-carbon house, which is 17.7, 5.7, and 6.95 meters in length, width, and height, respectively. A dynamic ventilation shaft of 1.85m by 1.6m is located at the middle of the house. According to buoyancy effect and stack effect, the dynamic ventilation shaft could drive the hot air out and enhance indoor ventilation. In this study, numerical simulations were compared with field measurements to validate the Computational Fluid Dynamics (CFD) software. This software was the major tool to investigate the natural ventilation of the low-carbon house. Considering the dynamic ventilation shaft parameters affecting indoor ventilation, this study used orthogonal array method to simulate the building ventilation in three modes: buoyancy ventilation, wind-driven ventilation, and both combined. For design of dynamic ventilation shaft, raising it to make the vent area equal to 2 times of cross-sectional area at wind-driven mode is more appropriate. At buoyancy mode, the vent area close to the cross-sectional area would be proper. Regarding the directions of wind and windows, windows facing the wind would result in the best ventilation. With the same air channel length, accumulate more heat in the vent shaft and stairwells could drive the indoor ventilation better.