Investigation of pressure drop in flexible ventilation ducts under different compression ratios and bending angles
Publication in refereed journal

香港中文大學研究人員
替代計量分析
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其它資訊
摘要Due to the large degree of freedom in terms of design and installation, flexible ventilation ducts are commonly used in ventilation systems. However, excessive use of flexible ducts may lead to greater pressure drop and higher energy consumption. This study conducted experimental measurements to characterize the pressure drop in flexible ventilation ducts with different compression ratios and bending angles. This investigation first measured the pressure drop in straight flexible ducts with four compression ratios under various airflow rates. The calculated friction factor for the straight flexible ducts was negatively associated with the compression ratio. Next, the pressure drops in single-bend flexible ducts with various bending angles from 30 degrees to 150 degrees were measured under various airflow rates. The calculated loss coefficient of the bend increased with the bending angle for single-bend flexible ducts. Finally, the influence of the intermediate duct length on the pressure drop across two bends was experimentally investigated. When the length of the intermediate duct was greater than eight times the inner diameter, the pressure drop across a double-bend flexible duct could be calculated from the friction factors and loss coefficients with a relative error less than 1%. The data obtained in this study can be used to calculate the total pressure loss in flexible ventilation ducting systems in buildings.
著者Ho Kam Dai, Wenjie Huang, Liye Fu, Chao-Hsin Lin, Daniel Wei, Zhongzhe Dong, Ruoyu You, Chun Chen
期刊名稱Building Simulation
出版年份2021
月份8
卷號14
期次4
頁次1251 - 1261
國際標準期刊號1996-3599
電子國際標準期刊號1996-8744
語言美式英語

上次更新時間 2021-14-06 於 23:59