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1、4502OptimumDuctDesignforVariableAirVolumeSystems,Part2:OptimizationofVAVDuctSystemsTaecheolKimJeffreyD.Spitler,Ph.D.,P.E.RonaldD.Delahoussaye,Ph.D.MemberASHRAEABSTRACTductdesignproblem.DesignconstraintsforVAVductsystemsareaddedaspenaltytermstotheobjectivefunctionforanyCurrentductdesignmethodsfor
2、variableairvolumeviolationoftheconstraints.TheNelderandMeaddownhill(VAV)systemsarebasedontheuseofpeakconstantairflow.simplexmethod(NelderandMead1965)isappliedtosearchHowever,VAVsystemsoperatemuchofthetimeatanoff-peakforacontinuousdesignsolutionfortheconstrainedductloadconditionandtheimpactofvary
3、ingairflowratestothedesignproblem,andapenaltyapproachforintegerprogram-sizingofductsystemshasnotbeenconsidered.Thisandamingisemployedtoimposepenaltiesofdiscreteviolationoncompanionpaperintroduceanoptimumductdesignproce-theobjectivefunctiontoenforcethesearchtoconvergetodureforVAVsystemstoinvestig
4、atetheimportanceofthevary-nominalductsizes.Ductfittinglosscoefficientsfordifferentingairflowstothesystemdesign.Hourlyairflowrequirements,designconditionsaresoughtusingaductfittingdatabasepart-loadfancharacteristics,andductstaticpressurecontrolprogramasdescribedinASHRAE(1993).areincorporatedintot
5、heproblemformulation.Constraints,suchasdiscreteductsizesandvelocitylimitations,areincor-ThisVAVoptimizationprocedure,theNelderandMeadporatedintotheductdesignprocedure.Inpart1,thedomaindownhillsimplexmethodwithapenaltyapproachforintegerofaVAVoptimizationproblemisanalyzedtodefinetheprob-programmin
6、g,isappliedtoseveralVAVductsystemsunderlemcharacteristicsandtosuggestanoptimizationprocedure.differentdesignconditions,suchasdifferentelectricrates,Inpart2,theVAVductdesignprocedureisfullydevelopedanddifferentductworkcosts,anddifferentsystemoperatingappliedtoseveralVAVductsystemswithdifferentpar
7、ameterschemes.Theoptimizedresultsarecomparedtothosederivedvalues.Theresultsareanalyzedtocompareductdesignmeth-fromequalfriction,staticregain,andtheT-method.Through-ods,andtheeffectofseveralfactorsthatinfluenceoptimalouttheco
