Assessment of Ventilation Efficiency for the Courtyard of Buildings

• Main Authors: I-AnHung, 洪一安
• Other Authors: Hsien-Te Lin
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/88161265817044596640

博士 === 國立成功大學 === 建築學系 === 102 === This study investigates the ventilation environment above the ground 1.5m of the courtyard space for the rectangle courtyard building in summer. It applies the Taguchi method to simplify the various factors and experiment compositions, then uses the Computation Fluid Dynamic (CFD) simulation to propose the Ventilation Potential (VP). This study also sorts the CFD simulation data of the previous researches to analyze and simplify the assessment factors, and calculates their efficiency for different level, including wind directions, aperture ratio, opening sides, courtyard’s width-to-depth ratio and building height. Finally, it creates an assessment system by several tables and regression formulas of courtyard wind environment. Almost all related researches showed that the wind directions usually play a significant role affects wind environment, it can get higher VP value especially when the incident angle of prevailing wind direction is oblique to courtyard opening. Besides, the more opening sides and aperture ratio can increase the VP value as well. Furthermore, the different opening sides go with the different influence factors, such as the influence factor for one-side opening group and the adjacent side openings group is wind direction; For the opposite-side openings group, its influence factors are wind direction, aperture ratio and building height; and the three side openings group’s influence factors are wind direction and aperture ratio; As for the four side openings group’s influence factors are aperture ratio and building height. At last, the study measures the wind speeds of several courtyard buildings, using them to compare with this assessment system, the result shows that the correlation is high(r=0.82), and the standard deviation is 0.13. It reveals the assessment system is reliable. So, general users can easily use the assessment system to understand the wind environment of a courtyard building approximately, and applies it to the architectural design for assuring the comfort of courtyard environment in the future.