Duct Design Basics Lesson 4 The Manual D Primer

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Presentation transcript:

Duct Design Basics Lesson 4 The Manual D Primer

Fitting Equivalent Length 4.5

What happens when we have a different reference velocity What happens when we have a different reference velocity? For example what would the EL be for the 1C fitting If we were designing a system to operate at 600 FPM?

Formula: ELFor Fitting = ELTable Value x [VFor Fitting ÷ VTable Value]2

Formula: ELFor Fitting = ELTable Value x [VFor Fitting ÷ VTable Value]2 ELFor Fitting = 35 x [600 ÷ 900]2 = 15.56

Formula: ELFor Fitting = ELTable Value x [VFor Fitting ÷ VTable Value]2 ELFor Fitting = 35 x [600 ÷ 900]2 = 15.56 0.444444….

What happens when we have a different reference friction rate What happens when we have a different reference friction rate? For example what would the EL be for the 1C fitting If we were designing a system to operate at a FR of 0.06?

Formula: ELFor Fitting = ELTable Value x [FRTable Value÷ FRFor Fitting] ELFor Fitting = 35 x [0.08 ÷ 0.06] = 46.67

Formula: ELFor Fitting = ELTable Value x [FRTable Value÷ FRFor Fitting] ELFor Fitting = 35 x [0.08 ÷ 0.06] = 46.67 1.3333….

What happens when we have a different reference friction rate and a different Velocity?

What happens when we have a different reference friction rate and a different Velocity? For example what would the EL be for the 1C fitting If we were designing a system to operate at a FR of 0.06 and a velocity of 600 FPM?

Formula: ELFor Fitting = ELTable Value x [FRTable Value÷ FRFor Fitting] x [VFor Fitting ÷ VTable Value]2

Formula: ELFor Fitting = ELTable Value x [FRTable Value÷ FRFor Fitting] x [VFor Fitting ÷ VTable Value]2 ELFor Fitting = 35 x [0.08 ÷ 0.06] x [600 ÷ 900]2 = 20.74

Formula: ELFor Fitting = ELTable Value x [FRTable Value÷ FRFor Fitting] x [VFor Fitting ÷ VTable Value]2 ELFor Fitting = 35 x [0.08 ÷ 0.06] x [600 ÷ 900]2 = 20.74 0.59

What would the EL be if we have a design for 500 FPM at 0.08 IWC?

Formula: ELFor Fitting = ELTable Value x [FRTable Value÷ FRFor Fitting] x [VFor Fitting ÷ VTable Value]2 ELFor Fitting = 75 x [0.08 ÷ 0.08] x [600 ÷ 700]2 = 55.1

What would the EL be if we have a design for 700 FPM at 0.06 IWC?

Formula: ELFor Fitting = ELTable Value x [FRTable Value÷ FRFor Fitting] x [VFor Fitting ÷ VTable Value]2 ELFor Fitting = 75 x [0.08 ÷ 0.06] x [700 ÷ 700]2 = 100

What would the EL be if we have a design for 500 FPM at 0.07 IWC?

Formula: ELFor Fitting = ELTable Value x [FRTable Value÷ FRFor Fitting] x [VFor Fitting ÷ VTable Value]2

Formula: ELFor Fitting = ELTable Value x [FRTable Value÷ FRFor Fitting] x [VFor Fitting ÷ VTable Value]2 ELFor Fitting = 75 x [0.08 ÷ 0.06] x [600 ÷ 700]2 = 74

Formula: ELFor Fitting = ELTable Value x [FRTable Value÷ FRFor Fitting] x [VFor Fitting ÷ VTable Value]2 ELFor Fitting = 75 x [0.08 ÷ 0.06] = 100 ELFor Fitting = 75 x [0.08 ÷ 0.10] = 60

Formula: ELFor Fitting = ELTable Value x [FRTable Value÷ FRFor Fitting] x [VFor Fitting ÷ VTable Value]2 ELFor Fitting = 75 x [0.08 ÷ 0.06] = 100 ELFor Fitting = 75 x [0.08 ÷ 0.10] = 60 ELFor Fitting = ELTable Value x [FRTable Value÷ FRFor Fitting] x [VFor Fitting ÷ VTable Value]2 ELFor Fitting = 75 x [600 ÷ 700] = 64.29 ELFor Fitting = 75 x [900 ÷ 700] = 96.42

Formula: ELFor Fitting = ELTable Value x [FRTable Value÷ FRFor Fitting] x [VFor Fitting ÷ VTable Value]2 ELFor Fitting = 75 x [0.08 ÷ 0.06] x [600 ÷ 700]2 = 74

For Math Lovers: A formula based on equal friction rates for the conversion from rectangular ducts to a circular equivalent. Round Duct Diameter (In) = 1.3 x [(a x b)0.625) ÷ (a + b)0.25] Where a = length of side one in inches and b = length of side 2 in inches a Side 1 Side 2 b

See Appendix 2 in Manual D for Conversion Charts and Formulas or use the ACCA Duct Slide Rule! For Math Lovers: A formula based on equal friction rates for the conversion from rectangular ducts to a circular equivalent. Round Duct Diameter (In) = 1.3 x [(a x b)0.625) ÷ (a + b)0.25] Where a = length of side one in inches and b = length of side 2 in inches a Side 1 Side 2 b

See Appendix 2 in Manual D for Conversion Charts and Formulas or use the ACCA Duct Slide Rule! For Math Lovers: A formula based on equal friction rates for the conversion from rectangular ducts to a circular equivalent. Round Duct Diameter (In) = 1.3 x [(a x b)0.625) ÷ (a + b)0.25] Where a = length of side one in inches and b = length of side 2 in inches a Side 1 Side 2 b