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AnalysisofIntroductionProducedbyZHEBackgroungResearchscopeGeneralpurpose

Urbanenvironmentpresentsimportantconstraintsfortheapplicationofnaturalventilation:lowerwindspeeds,higherambienttemperaturesduetourbanheatislandeffect,increasedoutdoornoiseandpollutionlevels.Hybridventilationisknowntoexploitthebenefitsofbothnaturalandmechanicalventilationmodes,tooptimizetheperformanceofventilation,bothfromthermalcomfortandindoorairquality.needfulbackgroundknowledgethemeaningofhybridventilationVerylimitedresearchhasbeencarriedoutregardingtheinfluenceoftheurbanenvironmentontheperformanceofnaturalandhybridventilationsystems.Severaltheoretical

andwindtunnelstudieshavebeenreported;however,onlyafewexperimentalurbancanyonstudiescanbefoundintheliterature.previousstudies

Existingempiricalmethodsproposecorrectionfactorstotakeintoaccountforthedecreaseofwindspeedintheurbanenvironmentbuttheyareofsimplifiednatureandtheyarenotproposedfordenseurbanenvironmentsanddeepcanyons.Besides,

onlyaminornumberofrealurbanbuildingswithhybridventilationsystemsexist,whereanextendedreviewofhybridventilationsystemsandexistingapplicationshasbeenprovidedbyDelsanteandVik.However,inmostcasestudies,veryfewrealmonitoringdataareprovided.existingproblems

SpecificresearchwasundertakenintheframeoftheURBVENTandRESHYVENTinordertostudytheimpactoftheurbanenvironmentontheefficiencyofnaturalandhybridventilationtechniques,respectively.Anumberoffieldandindoorexperimentalprocedureswereorganizedinatotalnumberofsevendifferenturbancanyons,duringsummer2001and2002,inAthens,Greece.theresearchscope

GeorgakisandSantamourishavecomparedthemeasuredagainstcalculatedairflowrates,usingAIOLOSsoftware,inanaturallyventilatedapartmentlocatedinadeeppedestriancanyon.Thestudywasperformedforsingle-sidedandcross-ventilationconfigurationsanditrevealedthatthepotentialofnaturalventilationisseriouslydecreasedintheurbanenvironment,whilehigherrorsmayoccurwhennon-appropriateclimaticdataareusedfornaturalventilationstudiesinurbanbuildings.experimentalmethodthepurposeoftheexperiment

Niachouetal.measuredtheindoorexchangeratesinthreetypicalbuildingapartmentsduringameasurementcampaign,organizedintwourbanstreetcanyonsnearthecentreofAthens,inordertostudytheimpactofurbanenvironmentontheperformanceofnaturalandhybridventilation,usingthetracergasdecaymethodwithone(N2O)andtwotracergases(N2OandSF6).experimentalmethod

Acomparativeanalysiswasperformedfortheestimationofair-exchangeratesbasedonsingle-andmultizonemethodologies.Itwasfoundthatwhenasingletracerisusedthenthesingle-zonemethodsaremoreaccurate;however,foramultizoneexperiment,amultitracergasisnecessaryandthemultizoneanalysisispreferable.theconclusionoftheexperiment

Inthepresentstudyafullcomparisonanalysis,takingintoaccountnominaltimeconstantsandair-exchangeefficiencies,isperformedfordifferentventilationsystemsunderspecificoutdoorconditionsintwourbanstreetcanyons.Amethodologytoestimatetheairexchangeefficiency,onthebasisofroommeanageofair,inmultitracergasexperimentsisintroduced.Thepresentpaperaimstoevaluatetheefficiencyofnaturalandhy

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