Predicting air pressure in drainage stack of high-rise building 被引量：1

Predicting air pressure in drainage stack of high-rise building

在线阅读下载PDF

导出

摘要 It is necessary to understand the features of air pressure in a drainage stack of a high-rise building for properly designing and operating a drainage system. This paper presents a mathematical model for predicting the stack performance. A step function is used to describe the effect of the air entrainment caused by the water discharged from branch pipes. An additional source term is introduced to reflect the gas-liquid interphase interaction （GLII） and stack base effect. The drainage stack is divided into upper and base parts. The air pressure in the upper part is predicted by a total variation diminishing （TVD） scheme, while in the base part, it is predicted by a characteristic line method （CLM）. The predicted results are compared with the data measured in a real-scale high- rise test building. It is found that the additional source term in the present model is effective. It intensively influences the air pressure distribution in the stack. The air pressure is also sensitive to the velocity-adjusting parameter （VAP）, the branch pipe air entrainment, and the conditions on the stack bottom. It is necessary to understand the features of air pressure in a drainage stack of a high-rise building for properly designing and operating a drainage system. This paper presents a mathematical model for predicting the stack performance. A step function is used to describe the effect of the air entrainment caused by the water discharged from branch pipes. An additional source term is introduced to reflect the gas-liquid interphase interaction （GLII） and stack base effect. The drainage stack is divided into upper and base parts. The air pressure in the upper part is predicted by a total variation diminishing （TVD） scheme, while in the base part, it is predicted by a characteristic line method （CLM）. The predicted results are compared with the data measured in a real-scale high- rise test building. It is found that the additional source term in the present model is effective. It intensively influences the air pressure distribution in the stack. The air pressure is also sensitive to the velocity-adjusting parameter （VAP）, the branch pipe air entrainment, and the conditions on the stack bottom.

作者 E. S. W. WONG 李应林朱祚金

机构地区 Industrial Center School of Engineering Science

出处《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2013年第3期351-362,共12页 应用数学和力学（英文版）

基金 Project supported by the National Natural Science Foundation of China (No. 10972212)

关键词 air pressure in drainage stack characteristic line method stack base effect interphase interaction air pressure in drainage stack, characteristic line method, stack base effect,interphase interaction

分类号 TU823 [建筑科学]

引文网络
相关文献

参考文献22

1Wong, E. S. W., Chan, D. W. T., and Zhu, Z. J. Fluctuation behaviors of air pressure in a high-rise building drainage system. Journal of Architechtural Engineering, 17(2), 82-84 (2011).
2Swaffield, J. A., Jack, L. B., and Campbell, D. P. Control and suppression of air pressure transients in building drainage and vent systems. Building and Environment, 39(7), 783-794 (2004).
3Kelly, D. A., Swaffield, J. A., Jack, L. B., Campbell, D. P., and Gormley, M. Pressure tran- sient identification of depleted appliance trap seals: a pressure pulse technique. Building Services Engineering Research and Technology, 29(2), 165-181 (2008).
4Swaflield, J. A. and Campbell, D. P. Air pressure transient propagation in building drainage vent systems, an application of unsteady flow analysis. Building and Environment, 27(3), 357-365 (1992).
5Swaffield, J. A. and Campbell, D. P. Numerical modelling of air pressure transient propagation in building drainage vent systems, including the influence of mechanical boundary conditions. Buildin9 and Environment, 27(3), 455-467 (1992).
6Swaffield, J. A. and Campbell, D. P. The simulation of air pressure propagation in building drainage and vent systems. Building and Environment, 30(1), 115-127 (1995).
7Wright, G. B., Jack, L. B., and Swaffield, J. A. Investigation and numerical modeling of roof drainage system under extreme events. Building and Environment, 41, 126-135 (2006).
8Swaffield, J. A. Sealed building drainage and vent systems--an application of active air pressure transient control and suppression. Building and Environment, 41, 1435-1446 (2006).
9Swaffield, J. A. Simulation of building drainage flows, waste solid transport and vent system transients. Building Services Engineering Research & Technology, 17(2), B4-B8 (1996).
10McDougall, J. A. and Swaffield, J. A. Simulation of building drainage system operation under water conservation design criteria. Building Services Engineering Research & Technology, 21(1), 41 51 (2000).