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1、翻译Sealedbuildingdrainageandventsystems—anapplicationofactiveairpressuretransientcontrolandsuppressionAbstractTheintroductionofsealedbuildingdrainageandventsystemsisconsideredaviablepropositionforcomplexbuildingsduetotheuseofactivepressuretransientcontrolan
2、dsuppressionintheformofairadmittancevalvesandpositiveairpressureattenuatorscoupledwiththeinterconnectionofthenetwork'sverticalstacks.Thispaperpresentsasimulationbasedonafour-stacknetworkthatillustratesflowmechanismswithinthepipeworkfollowingbothappliancedi
3、schargegenerated,andsewerimposed,transients.Thissimulationidentifiestheroleoftheactiveairpressurecontroldevicesinmaintainingsystempressuresatlevelsthatdonotdepletetrapseals.Furthersimulationexerciseswouldbenecessarytoprovideproofofconcept,anditwouldbeadvan
4、tageoustoparallelthesewithlaboratory,andpossiblysite,trialsforvalidationpurposes.Despitethiscautiontheinitialresultsarehighlyencouragingandaresufficienttoconfirmthepotentialtoprovidedefinitebenefitsintermsofenhancedsystemsecurityaswellasincreasedreliabilit
5、yandreducedinstallationandmaterialcosts.Keywords:Activecontrol;Trapretention;TransientpropagationNomenclatureC+-characteristicequationscwavespeed,m/sDbranchorstackdiameter,mffrictionfactor,UKdefinitionviaDarcyΔh=4fLu2/2Dggaccelerationduetogravity,m/s2Kloss
6、coefficientLpipelength,mpairpressure,N/m2ttime,sumeanairvelocity,m/sxdistance,mγratiospecificheatsΔhheadloss,mΔppressuredifference,N/m2Δttimestep,sΔxinternodallength,mρdensity,kg/m3SuffixAappliancesideoftrapBbranchlocalconditionsatnodeTtrapatmatmosphericpr
7、essureFfrictionRroomSsystemsideoftrapwwaterArticleOutlineNomenclature1.Introduction—airpressuretransientcontrolandsuppression2.Mathematicalbasisforthesimulationoftransientpropagationinmulti-stackbuildingdrainagenetworks3.Roleofdiversityinsystemoperation4.S
8、imulationoftheoperationofamulti-stacksealedbuildingdrainageandventsystem5.Simulationsignconventions6.Waterdischargetothenetwork7.Surchargeatbaseofstack18.Sewerimposedtransients9.Trapsealoscillationandretentio
