ASHRAE.HandBook_20-2008 FANS

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1、RelatedCommercialResourcesCHAPTER20FANSTypesofFans............................................................................20.1SystemEffects...........................................................................20.7PrinciplesofOperation................

2、...........................................20.1Selection..................................................................................20.7TestingandRating..................................................................20.4ParallelFanOperation...........

3、................................................20.7FanLaws.................................................................................20.4Noise........................................................................................20.8FanandSystemPressu

4、reVibration..................................................................................20.8Relationships.......................................................................20.5ArrangementandInstallation................................................

5、.20.8TemperatureRiseAcrossFans................................................20.6Control....................................................................................20.9DuctSystemCharacteristics...................................................20.6Sy

6、mbols.................................................................................20.10AFANisanairpumpthatcreatesapressuredifferenceandbladesoftheimpellerimpartkineticenergytotheairbychangingcausesairflow.Theimpellerdoesworkontheair,impartingtoitsvelocity

7、.Velocitychangeisinthetangentialandradialvelocityitbothstaticandkineticenergy,whichvaryinproportion,depend-componentsforcentrifugalfans,andintheaxialandtangentialingonthefantype.velocitycomponentsforaxial-flowfans.Fanefficiencyratingsarebasedonidealconditions

8、;somefansareCentrifugalfanimpellersproducepressurefromthe(1)centrif-ratedatmorethan90%totalefficiency.However,actualconnectionsugalforcecreatedbyrotatingtheaircolumncontainedbetweentheoft