建筑给水排水毕业设计专业外文翻译.docx

翻译Sealed building drainage and vent systems—an application of active air pressure transient control and suppressionAbstractThe 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 NomenclatureC+- characteristic equations /science?_ob=MathURL_method=retrieve_udi=B6V23-4H3BKW0-3_mathId=mml26_user=1021790_cdi=5691_rdoc=1_ArticleListID=543804161_acct=C000050480_version=1_userid=1021790md5=32d70ed8f007bdacebb4213ef78dd119c wave speed, m/s /science?_ob=MathURL_method=retrieve_udi=B6V23-4H3BKW0-3_mathId=mml27_user=1021790_cdi=5691_rdoc=1_ArticleListID=543804161_acct=C000050480_version=1_userid=1021790md5=41c52da2d630fe97cbe78aafd7940b44D branch or stack diameter, m /science?_ob=MathURL_method=retrieve_udi=B6V23-4H3BKW0-3_mathId=mml30_user=1021790_cdi=5691_rdoc=1_ArticleListID=543804161_acct=C000050480_version=1_userid=1021790md5=8ea1d4c53590c0a24e95ac4a1b10494ef frictio