《建筑给排水_外文文献翻译（中英文对照）》-毕业设计（论文）.doc

w PAGE 本科毕业设计 外文文献及译文 文献、资料题目：Sealed building drainage and vent systems 文献、资料来源：国道数据库 文献、资料发表（出版）日期：2005.9.12 院 （部）： 市政与环境工程学院 专 业： 给水排水工程 班 级： 姓 名： 学 号： 指导教师： 翻译日期： 2012.06 w 外文文献： Sealed building drainage and vent systems —an application of active air pressure transient control and suppression Abstract The introduction of sealed building drainage and vent systems is considered a viable proposition for complex buildings due to the use of active pressure transient control and suppression in the form of air admittance valves and positive air pressure attenuators coupled with the interconnection of the networks vertical stacks. This paper presents a simulation based on a four-stack network that illustrates flow mechanisms within the pipework following both appliance discharge generated, and sewer imposed, transients. This simulation identifies the role of the active air pressure control devices in maintaining system pressures at levels that do not deplete trap seals. Further simulation exercises would be necessary to provide proof of concept, and it would be advantageous to parallel these with laboratory, and possibly site, trials for validation purposes. Despite this caution the initial results are highly encouraging and are sufficient to confirm the potential to provide definite benefits in terms of enhanced system security as well as increased reliability and reduced installation and material costs. Keywords: Active control; Trap retention; Transient propagation Nomenclature \o Click to view the MathML source C+-——characteristic equations \o Click to view the MathML source c——wave speed, m/s \o Click to view the MathML source D——branch or stack diameter, m \o Click to view the MathML source f——friction factor, UK definition via Darcy \o Click to view the MathML source Δh=4fLu2/2Dg \o Click to view the MathML source g——acceleration due to gravity, \o Click to view the MathML source m/s2 \o Click to view the MathML sourc