4 The Foibles, Follies and Fixes of Flex...4_The Foibles, Follies and Fixes of Flex Created Date...
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Transcript of 4 The Foibles, Follies and Fixes of Flex...4_The Foibles, Follies and Fixes of Flex Created Date...
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J@HC?
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,K*3+'>%62:+$4'%='0*L#7'M#""-'1&+2+*74 .2%76>:$-'6$+7'N#:/'O+2K#$$#%&
??@JCP
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The2CausesofReducedAirFlow
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C('F2#>:#%&
?Q@III
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9#3#7'L$('F"+G
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,K*3+'=2%K'!"#$%&'("#)"*+',$+-%).')/"+0,(%'-'R4':/+'!#2'8%&7#:#%&3'8%&:2*>:%2$'%='!K+2#>*
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?J@JPQ
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TheDuctDesignProcess
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DuctDesignReferenceBooks
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AvailableStaticPressure
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EquivalentLength
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FrictionRate
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IB@C-VPB
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IH@C-CPB
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Fittingsdominatepressuredrops…
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Poorlyinstalledflexductcanbejustasbadforairflow
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FromFantasytoReality
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DuctLayout
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DuctLayout
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DuctLayout
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DuctLayout
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DuctLayout
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FifthEdition
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“Installductfullyextended,donotinstallinthecompressedstateoruseexcesslengths.Thiswillnoticeablyincreasefrictionlosses”.
AirDuctCouncilFlexibleDuctPerformance&InstallationStandards
InstallationGuidelines
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PressureDropResearch
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Air
BlowerNozzle
Chamber
Temperature T1Temperature T2
Entry Duct> 10 Dd
Temperature T3
PiezometerRings
Test Duct
Exit Duct> 4 Dd
VSD
Air
BlowerNozzle
Chamber
Temperature T1Temperature T2
Entry Duct> 10 Dd
Temperature T3
PiezometerRings
Test Duct
Exit Duct> 4 Dd
VSD
DataAcquisition(DAQ)setup
• ANSI/ASHRAEStandard120requirementswereusedtodesignthesystemandprocessthedataafteracquisition.
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ANSI/ASHRAEStandard120TestingProtocol
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/@AB$C$/AD,/E$A6'8-'1-$F%G$!#)6087$91*6*.*3
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8”
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ComputationalFluidDynamics(CFD)ComputerGeneratedModelofAirFlowinFlex
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v/U: 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3
ComputationalFluidDynamics(CFD)ComputerGeneratedModelofAirFlowinFlex
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TheNewASHRAEDuctCalculator
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QuickReferenceTool
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LaboratoryDatacomparedwithin10%ofcalculatedvalues,soASHRAEpublishedformulaswereusedto
createthistool.
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CompressionGraphic
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PGQ$&*
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RoundSheetMetalDuctvsFlexibleDuct4%,15%,30%Compression
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200cfm /650fpm
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8”RoundSheetMetalDuct=9”FlexibleDuctat4%compression
.08”-.09”FrictionLoss
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8”RoundMetalDuct=10”FlexibleDuctat15%Compression,12”FlexibleDuctat30%Compression
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IsRigidDucttheAnswer?
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UniformMechanicalCode
603.4.1LengthLimitation. Factory-madeflexibleairductsandconnectorsshallbenotmorethan5feet(1524mm)inlengthandshallnotbeusedinlieuofrigidelbowsorfittings.Flexibleairductsshallbepermittedtobeusedasanelbowataterminaldevice.Exception: Residentialoccupancies.
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FlexDuctSystemsThatWork
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[*L#&'M+*"4
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HH@CC-BHJ
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AdvantagesofFlexDuct
• Options• Cost• Noisecontrol• Energyefficiency
Butithastoinstalledproperly!
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AlwaysCarryFlexDuct!
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Questions?
Lastone
