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CENTRIFUGALPRINCIPLESTERMS
AgendaTYPESOFBLOWERSBASICENGINEERINGLAWSFANLAWSTEMPERATUREEFFECTSBLOWERCURVECHARACTERISTICSBLOWERCONTROLBLOWERSURGEBLOWERSELECTION
Ablowerisalowpressure,highvolumecompressorWhatisaBlower?TypesOfBlowers
ConstantFlow-VariablePressureRotaryLobeHelicalScrewTypesOfBlowersPositiveDisplacement
VariableFlow-ConstantPressureTypesOfBlowersDynamic
VOLUMEPRESSURERegenerative:PropertiesofbothLobeandCFLimitedflow,varyingpressureHPincreasesasFlowdecreasesRotaryLobe:ConstantFlow/VariablePressureHPincreasesasFlowdecreasesConstantPressure/VariableFlowHPdecreasesasFlowdecreasesCentrifugal:TypesOfBlowersTypicalCurve
SCFM=Standardcubicfeetperminute“Standard”isaspecificsetofconditions.Ourstandardis14.7psia,68?Fand36%RH(unlessotherwisespecified)FlowBasicEngineeringLaws
NM3/HR=NormalCubicMetersPerHour“Normal”isaspecificsetofconditions.Ourstandardis1.013Bara,0?Cand0%RH(unlessotherwisespecified)FlowBasicEngineeringLaws
Vn=Vs*(Tn/TS)ThechangeinvolumeisdirectlyrelatedtothechangeintemperatureThomas’sLawBasicEngineeringLaws
Vn=Vs*(Ps/Pn)ThechangeinvolumeisinverselyrelatedtothechangeinpressureBoyle’sLawBasicEngineeringLaws
CORRECTIONNECESSARYFORACCURATEAMOUNTOFGASTRANSFERACTUALm3/hr30°C1.000BAR(A)60%RH(TYPICALONLY)“MAXIMUM”CASEGASNORMALm3/hr0°C1.013BAR(A)0%RH(FIXED)STANDARDGASEQUALOXYGENVOLUMEACT=VOLUMENORMTACTTNORM((PACTPNORM((SCFM=“Standard”isaspecificsetofconditions.Ourstandardis14.7psia,68?Fand36%RH(unlessotherwisespecified)NM3/HR=“NORMAL”isaspecificsetofconditions.Ourstandardis1.013Bara,0DegCand0%RH(unlessotherwisespecified)BasicEngineeringLaws
Thevolumeofairincfmenteringtheblowerinletisdirectlyproportionaltothespeedinrpm’sQn=Qs*(RPMn)/(RPMs)Qn=newflowincfmQs=originalflowincfmR
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