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| CALC : Flow : Flowrate 006 : Flow Rate From Av Volume Flow Coefficient and Pressure Losses : Calculator
Description : Calculate the volume flow rate Q from the volume flow coefficient Av and the friction pressure loss ΔPf.
Discussion : The volume flowrate Q is independent of the diameter.
Input Variables :
- ΔPf = Fluid Friction Pressure Loss
- ρ = Fluid Density
- Av = Volume Flow Coefficient Av or Cv
Output Variables :
- Q = Fluid Volume Flowrate
Calculation :
Q = Av √( ΔPf / ρ )
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| CALC : Flow : Flowrate 009 : Flow Rate From Total Flow Coefficient Factor Av or Cv and Pressure Difference : Calculator
Description : Calculate flow rate Q from the friction pressure loss ΔPf and a list of Av flow coefficient values.
Discussion : The Av coefficients are converted to equivalent K factors relative to section diameter Do and then summed to calculate the total K value. Changing the section diameter Do does not affect the friction pressure loss ΔPf.
Input Variables :
- ΔPf = Fluid Friction Pressure Loss
- ρ = Fluid Density
- Av = K Friction Factor List
- Do = Section Internal Diameter
Output Variables :
- K = Dimensionless Friction Pressure Loss Factor K
- Ke = K Equivalent Friction Factor List
- Q = Fluid Volume Flowrate
Calculation :
Loop i
Ke[i] = ( π 2 Do 4 ) / ( 8 Av[i] 2 )
End of i Loop
K = ArraySum( Ke )
Q = π Do 2 √( ΔPf / ( 8 K ρ ) )
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| CALC : Flow : Friction 016 : Pressure Loss From Av Volume Flow Coefficient and Flow Rate : Calculator
Description : Calculate the friction pressure loss ΔPf from the flow coefficient Av and the volume flow rate Q.
Discussion : The friction pressure loss ΔPf is independent of the diameter used.
Input Variables :
- ρ = Fluid Density
- Av = Volume Flow Coefficient Av or Cv
- Q = Fluid Volume Flowrate
Output Variables :
- ΔPf = Fluid Friction Pressure Loss
Calculation :
ΔPf = Q 2 ρ / Av 2
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| CALC : Flow : Friction 018 : Pressure Loss From Total Flow Coefficient Factor Av or Cv and Flow Rate : Calculator
Description : Calculate the friction pressure loss ΔPf from a list of Av coefficient values. :new:The tool converts the Av coefficients to equivalent K factor values relative to section diameter Do, then sums the equivalent K values. Changing the section diameter Do does not affect the friction pressure loss ΔPf.
Input Variables :
- ρ = Fluid Density
- Av = K Friction Factor List
- Do = Section Internal Diameter
- Q = Fluid Volume Flowrate
Output Variables :
- ΔPf = Fluid Friction Pressure Loss
- K = Dimensionless Friction Pressure Loss Factor K
- Ke = K Equivalent Friction Factor List
Calculation :
Loop i
Ke[i] = ( π 2 Do 4 ) / ( 8 Av[i] 2 )
End of i Loop
K = ArraySum( Ke )
ΔPf = 8 K ρ Q 2 / ( π 2 Do 4 )
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| CALC : Flow : Friction 021 : Volume Flow Coefficients Factor Av or Cv From Flowrate and Pressure Loss : Calculator
Description : Calculate the volume flow coefficient Av or Cv, Kv etc from the volume flow rate Q and the friction pressure loss ΔPf.
Discussion : The volume flow coefficient Av is independent of diameter.
Input Variables :
- ΔPf = Fluid Friction Pressure Loss
- ρ = Fluid Density
- Q = Fluid Volume Flowrate
Output Variables :
- Av = Volume Flow Coefficient Av or Cv
Calculation :
Av = Q √( ρ / ΔPf )
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| CALC : Flow : Friction 022 : Volume Flow Coefficient Factors Av or Cv From K Friction Factor : Calculator
Description : Calculate the volume flow coefficient Av or Cv, Kv etc from the friction factor or pressure loss factor K.
Discussion : The volume flow coefficient Av can also be expressed as Cv (US, UK and Metric) or Kv.
Input Variables :
- D = Section Internal Diameter
- K = Dimensionless Friction Pressure Loss Factor K
Output Variables :
- Av = Volume Flow Coefficient Av or Cv
Calculation :
Av = π D 2 / √( 8 K )
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| CALC : Flow : Friction 023 : Volume Flow Factor Av or Cv From Discharge Coefficient Cd : Calculator
Description : Calculate the volume flow coefficient Av or Cv, Kv etc from the discharge coefficient Cd.
Discussion : The discharge coefficient Cd should be positive and less than 1. Other values of Cd will give invalid results. The volume flow coefficient can also be expressed as Cv (US, UK and Metric) and Kv. Changes in height are ignored. D2 should be smaller than D1.
Figures :
Input Variables :
- Cd = Dimensionless Discharge Coefficient Cd
- D1 = Section 1 Internal Diameter
- D2 = Section 2 Internal Diameter
Output Variables :
- Av = Volume Flow Coefficient Av or Cv
Calculation :
Av = π D2 2 / √( 8 ( 1 / Cd 2 - 1 )( 1 - D2 4 / D1 4 ) )
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| CALC : Flow : Friction 041 : Friction Pressure Loss From Static Pressure Difference : Calculator
Description : Calculate the friction pressure loss ΔPf from the static pressure difference ΔP between sections with varying diameter.
Discussion : The static pressure difference ΔP is the measured pressure difference. It is different from the friction pressure loss ΔPf because of the different velocity pressure in the sections. Changes in diameter between the two measurement points (D1 and D2) do not affect the result.
Figures :
Input Variables :
- ΔP = Fluid Static Pressure Difference
- ρ = Fluid Density
- D1 = Section 1 Internal Diameter
- D2 = Section 2 Internal Diameter
- Q = Fluid Volume Flowrate
Output Variables :
- ΔPf = Fluid Friction Pressure Loss
Calculation :
ΔPf = ΔP + 8 ρ Q 2 / π 2 ( D2 4 - D1 4 ) / ( D2 4 D1 4 )
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| CALC : Flow : Friction 042 : Static Pressure Difference From Friction Pressure Loss : Calculator
Description : Calculate the static pressure difference ΔP from the friction pressure loss ΔPf between sections with varying diameter.
Discussion : The friction pressure loss is the pressure lost by fluid friction. It is different to the static pressure difference ΔP, the measured pressure difference, because of the different velocity pressure in the sections. Changes in diameter between the two measurement points (D1 and D2) do not affect the result.
Figures :
Input Variables :
- ΔPf = Fluid Friction Pressure Loss
- ρ = Fluid Density
- D1 = Section 1 Internal Diameter
- D2 = Section 2 Internal Diameter
- Q = Fluid Volume Flowrate
Output Variables :
- ΔP = Fluid Static Pressure Difference
Calculation :
ΔP = ΔPf - 8 ρ Q 2 / π 2 ( D2 4 - D1 4 ) / ( D2 4 D1 4 )
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