Pressure Drop in Circular Duct Calculator

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Pressure

Continuity Equation for Ducts

Friction Factor

Parameters of Ducts

Pressure Loss in Ducts

✖Friction Factor in Duct is dimensionless number depending upon the surface of the duct.ⓘ Friction Factor in Duct [f]			+10% -10%
✖Length of Duct is defined as the measurement or extent of something from end to end of ducts.ⓘ Length of Duct [L]			+10% -10%
✖Mean Velocity of Air is defined as the time average of the velocity of a fluid at a fixed point, over a somewhat arbitrary time interval T counted from some fixed time t0.ⓘ Mean Velocity of Air [V_mean]			+10% -10%
✖Diameter of Circular Duct is a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.ⓘ Diameter of Circular Duct [d]			+10% -10%

✖Pressure drop due to friction is the decrease in the value of the pressure due to the influence of friction.ⓘ Pressure Drop in Circular Duct [Pf]

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Formula

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Pressure Drop in Circular Duct

Formula

`"Pf" = (0.6*"f"*"L"*"V"_{"mean"}^2)/("d"/4)`

Example

`"83669.72mmAq"=(0.6*"0.8"*"19m"*("15m/s")^2)/("0.01m"/4)`

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Pressure Drop in Circular Duct Solution

STEP 0: Pre-Calculation Summary

Formula Used

Pressure Drop = (0.6*Friction Factor in Duct*Length of Duct*Mean Velocity of Air^2)/(Diameter of Circular Duct/4)
Pf = (0.6*f*L*V_mean^2)/(d/4)
This formula uses 5 Variables

Variables Used

Pressure Drop - (Measured in Pascal) - Pressure drop due to friction is the decrease in the value of the pressure due to the influence of friction.
Friction Factor in Duct - Friction Factor in Duct is dimensionless number depending upon the surface of the duct.
Length of Duct - (Measured in Meter) - Length of Duct is defined as the measurement or extent of something from end to end of ducts.
Mean Velocity of Air - (Measured in Meter per Second) - Mean Velocity of Air is defined as the time average of the velocity of a fluid at a fixed point, over a somewhat arbitrary time interval T counted from some fixed time t0.
Diameter of Circular Duct - (Measured in Meter) - Diameter of Circular Duct is a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.

STEP 1: Convert Input(s) to Base Unit

Friction Factor in Duct: 0.8 --> No Conversion Required
Length of Duct: 19 Meter --> 19 Meter No Conversion Required
Mean Velocity of Air: 15 Meter per Second --> 15 Meter per Second No Conversion Required
Diameter of Circular Duct: 0.01 Meter --> 0.01 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

Pf = (0.6*f*L*V_mean^2)/(d/4) --> (0.6*0.8*19*15^2)/(0.01/4)

Evaluating ... ...

Pf = 820800

STEP 3: Convert Result to Output's Unit

820800 Pascal -->83669.7247706422 Millimeter Water (4 °C) (Check conversion here)

FINAL ANSWER

83669.7247706422 ≈ 83669.72 Millimeter Water (4 °C) <-- Pressure Drop

(Calculation completed in 00.004 seconds)

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Home » Physics » Refrigeration and Air Conditioning » Ducts » Pressure » Pressure Drop in Circular Duct

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Created by Abhishek Dharmendra Bansile

Vishwakarma Institute of Information Technology, Pune (VIIT Pune), Pune

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National Institute Of Technology (NIT), Hamirpur

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< 17 Pressure Calculators

Length of Duct given Pressure Loss due to Friction

Go Length of Duct = (2*Pressure Loss due to Friction in Ducts*Hydraulic Mean Depth)/(Friction Factor in Duct*Air Density*Mean Velocity of Air^2)

Pressure Loss due to Friction in Ducts

Go Pressure Loss due to Friction in Ducts = (Friction Factor in Duct*Length of Duct*Air Density*Mean Velocity of Air^2)/(2*Hydraulic Mean Depth)

Pressure Drop in Square Duct

Go Pressure Drop = (0.6*Friction Factor in Duct*Length of Duct*Mean Velocity of Air^2)/((Side^2)/(2*(Side+Side)))

Pressure Drop in Circular Duct

Go Pressure Drop = (0.6*Friction Factor in Duct*Length of Duct*Mean Velocity of Air^2)/(Diameter of Circular Duct/4)

Pressure Loss due to Gradual Contraction given Pressure Loss Coefficient at Section 1

Go Dynamic Pressure Loss = 0.6*Velocity of Air at Section 1^2*Pressure Loss Coefficient*Pressure Loss Coefficient at 1

Pressure Loss due to Gradual Contraction given Velocity of Air at Point 2

Go Dynamic Pressure Loss = 0.6*Velocity of Air at Section 2^2*Pressure Loss Coefficient*Pressure Loss Coefficient at 2

Dynamic Loss Coefficient given Equivalent Additional Length

Go Dynamic Loss Coefficient = (Friction Factor in Duct*Equivalent Additional Length)/Hydraulic Mean Depth

Pressure Loss Coefficient at Outlet of Duct

Go Pressure Loss Coefficient at 2 = (Cross-Sectional Area of Duct at Section 2/Cross-Sectional Area of Duct at Section 1-1)^2

Pressure Loss Coefficient at Inlet of Duct

Go Pressure Loss Coefficient at 1 = (1-Cross-Sectional Area of Duct at Section 1/Cross-Sectional Area of Duct at Section 2)^2

Total Pressure required at Inlet to Duct

Go Total Pressure Required = Pressure Loss due to Friction in Ducts+Velocity Pressure in Ducts

Pressure Loss due to Sudden Contraction given Velocity of Air at point 2

Go Dynamic Pressure Loss = 0.6*Velocity of Air at Section 2^2*Pressure Loss Coefficient at 2

Pressure Loss due to Sudden Enlargement

Go Dynamic Pressure Loss = 0.6*(Velocity of Air at Section 1-Velocity of Air at Section 2)^2

Pressure Loss due to Sudden Contraction given Velocity of Air at Point 1

Go Dynamic Pressure Loss = 0.6*Velocity of Air at Section 1^2*Dynamic Loss Coefficient

Dynamic Loss Coefficient given Dynamic Pressure Loss

Go Dynamic Loss Coefficient = Dynamic Pressure Loss/(0.6*Velocity of Air^2)

Pressure Loss at Suction

Go Dynamic Pressure Loss = Dynamic Loss Coefficient*0.6*Velocity of Air^2

Dynamic Pressure Loss

Go Dynamic Pressure Loss = Dynamic Loss Coefficient*0.6*Velocity of Air^2

Pressure Loss at Discharge or Exit

Go Dynamic Pressure Loss = 0.6*Velocity of Air^2

Pressure Drop in Circular Duct Formula

Pressure Drop = (0.6*Friction Factor in Duct*Length of Duct*Mean Velocity of Air^2)/(Diameter of Circular Duct/4)
Pf = (0.6*f*L*V_mean^2)/(d/4)

Pressure drop in ducts

Pressure loss in ductwork has three components, frictional losses along duct walls and dynamic losses in fittings, and component losses in duct-mounted equipment. Due to physical items with known pressure drops, such as hoods, filters, louvers, or dampers.

How to Calculate Pressure Drop in Circular Duct?

Pressure Drop in Circular Duct calculator uses Pressure Drop = (0.6*Friction Factor in Duct*Length of Duct*Mean Velocity of Air^2)/(Diameter of Circular Duct/4) to calculate the Pressure Drop, The Pressure drop in circular duct formula is defined as the pressure drops in the direction of flow, the pressure drop is due to Fluid friction or Momentum change due to change of direction and/or velocity in circular ducts. Pressure Drop is denoted by Pf symbol.

How to calculate Pressure Drop in Circular Duct using this online calculator? To use this online calculator for Pressure Drop in Circular Duct, enter Friction Factor in Duct (f), Length of Duct (L), Mean Velocity of Air (V_mean) & Diameter of Circular Duct (d) and hit the calculate button. Here is how the Pressure Drop in Circular Duct calculation can be explained with given input values -> 8529.024 = (0.6*0.8*19*15^2)/(0.01/4).

FAQ

What is Pressure Drop in Circular Duct?

The Pressure drop in circular duct formula is defined as the pressure drops in the direction of flow, the pressure drop is due to Fluid friction or Momentum change due to change of direction and/or velocity in circular ducts and is represented as Pf = (0.6*f*L*V_mean^2)/(d/4) or Pressure Drop = (0.6*Friction Factor in Duct*Length of Duct*Mean Velocity of Air^2)/(Diameter of Circular Duct/4). Friction Factor in Duct is dimensionless number depending upon the surface of the duct, Length of Duct is defined as the measurement or extent of something from end to end of ducts, Mean Velocity of Air is defined as the time average of the velocity of a fluid at a fixed point, over a somewhat arbitrary time interval T counted from some fixed time t0 & Diameter of Circular Duct is a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.

How to calculate Pressure Drop in Circular Duct?

The Pressure drop in circular duct formula is defined as the pressure drops in the direction of flow, the pressure drop is due to Fluid friction or Momentum change due to change of direction and/or velocity in circular ducts is calculated using Pressure Drop = (0.6*Friction Factor in Duct*Length of Duct*Mean Velocity of Air^2)/(Diameter of Circular Duct/4). To calculate Pressure Drop in Circular Duct, you need Friction Factor in Duct (f), Length of Duct (L), Mean Velocity of Air (V_mean) & Diameter of Circular Duct (d). With our tool, you need to enter the respective value for Friction Factor in Duct, Length of Duct, Mean Velocity of Air & Diameter of Circular Duct and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Pressure Drop?

In this formula, Pressure Drop uses Friction Factor in Duct, Length of Duct, Mean Velocity of Air & Diameter of Circular Duct. We can use 1 other way(s) to calculate the same, which is/are as follows -

Pressure Drop = (0.6*Friction Factor in Duct*Length of Duct*Mean Velocity of Air^2)/((Side^2)/(2*(Side+Side)))

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