Quick Answer
Calculate BIM MEP Duct Friction Loss per Unit Length (Circular/Rectangular)
Calculator
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Find Engineering Solutions →Result Interpretation
BIM MEP Duct Friction Loss per Unit Length (Circular/Rectangular) calculator computes Pressure Drop per Unit Length in Pa/m using the defined engineering formula and the input values provided. Pressure Drop per Unit Length is expressed in Pa/m. No universal acceptance threshold is defined by this calculator.
Worked Example
Verified calculation
Given:
- Hydraulic Diameter = 0.3
- Air Velocity = 5
- Air Density = 1.204
- Darcy Friction Factor = 0.02
Expected Result:
- Pressure Drop per Unit Length = 0.50166666666667
Engineering Interpretation:
Under the given input conditions, the calculated result is: Pressure Drop per Unit Length = 0.50166666666667 Pa/m.
The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from deterministically validated test cases.
Formula / Method
pressure drop per unit length = (darcy friction factor / (2.0 * hydraulic diameter)) * (air density * pow(air velocity, 2) / 2.0)Formula family: formula_bim_bim_mep_duct_friction_loss_calculator_circular_rectangular_ducts
Variables
| Symbol | Label | Role | Description |
|---|---|---|---|
| hydraulic_diameter | Hydraulic Diameter | INPUT | Hydraulic Diameter |
| air_velocity | Air Velocity | INPUT | Air Velocity |
| air_density | Air Density | INPUT | Air Density |
| friction_factor | Darcy Friction Factor | INPUT | Darcy Friction Factor |
| pressure_drop_per_unit_length | Pressure Drop per Unit Length | OUTPUT | Pressure Drop per Unit Length |
Calculation Steps
- Enter the hydraulic diameter in m.
- Enter the air velocity in m/s.
- Enter the air density in kg/m³.
- Enter the darcy friction factor in dimensionless.
- Step 1: Compute pressure drop per unit length.
- Read the pressure drop per unit length (Pa/m) from the results.
Engineering Summary
Calculate BIM MEP Duct Friction Loss per Unit Length (Circular/Rectangular)
Frequently Asked Questions
What does this calculator calculate?
The BIM MEP Duct Friction Loss per Unit Length (Circular/Rectangular) calculator estimates Pressure Drop per Unit Length based on the input parameters you provide
Why is hydraulic diameter important in this calculation?
hydraulic diameter is directly proportional to pressure drop per unit length. When you enter hydraulic diameter in m, the calculator uses it in the engineering formula to compute the output
How should I interpret the result pressure drop per unit length?
The calculator outputs pressure drop per unit length in Pa/m. The result is computed directly from the input values using the defined engineering formula
What units should I use for the inputs?
Enter each value in the units shown next to the input field: Hydraulic Diameter (m), Air Velocity (m/s), Air Density (kg/m³), Darcy Friction Factor (dimensionless). Make sure all inputs use the specified units for consistent results
What assumptions does this calculator use?
This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment
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