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Duct Pressure Drop Calculator

Translation missing: es.pages.duct_pressure_loss_estimator.banner_title

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  • Translation missing: es.pages.duct_pressure_loss_estimator.friction_loss: Translation missing: es.pages.duct_pressure_loss_estimator.friction_loss_des
  • Translation missing: es.pages.duct_pressure_loss_estimator.dynamic_loss: Translation missing: es.pages.duct_pressure_loss_estimator.dynamic_loss_des

Translation missing: es.pages.duct_pressure_loss_estimator.concepts_definitions:

  • Translation missing: es.pages.duct_pressure_loss_estimator.air_density: \(\rho\) [kg/m³]. Standard: \(1.204\ \text{kg/m}^3\). Translation missing: es.pages.duct_pressure_loss_estimator.air_density_des
  • Translation missing: es.pages.duct_pressure_loss_estimator.air_viscosity \(\mu\) [Pa·s]: Translation missing: es.pages.duct_pressure_loss_estimator.air_viscosity_des \(1.825 \times 10^{-5}\ \text{Pa·s}\).
  • Translation missing: es.pages.duct_pressure_loss_estimator.airflow_rate \(Q\) [m³/s or CFM]: Translation missing: es.pages.duct_pressure_loss_estimator.airflow_rate_des (CFM or m³/s).
  • Translation missing: es.pages.duct_pressure_loss_estimator.duct_area \(A\) [m²]: Translation missing: es.pages.duct_pressure_loss_estimator.duct_area_des
    • Translation missing: es.pages.duct_pressure_loss_estimator.circular_ducts_diameter \[A = \pi \left(\frac{D}{2}\right)^2\]
    • Translation missing: es.pages.duct_pressure_loss_estimator.rectangular_ducts_diameter_txt_1 \(W\) Translation missing: es.pages.duct_pressure_loss_estimator.rectangular_ducts_diameter_txt_2 \(H\): \[A = W \times H\]
  • Translation missing: es.pages.duct_pressure_loss_estimator.air_velocity \(V\): Translation missing: es.pages.duct_pressure_loss_estimator.air_velocity_des \[V = \frac{Q}{A}\].
  • Translation missing: es.pages.duct_pressure_loss_estimator.hydraulic_diameter ($D_h$): Translation missing: es.pages.duct_pressure_loss_estimator.hydraulic_diameter_des
    • Translation missing: es.pages.duct_pressure_loss_estimator.circular_ducts: \(\;D_h = D\)
    • Translation missing: es.pages.duct_pressure_loss_estimator.rectangular_ducts: \(\;D_h = \frac{2WH}{W+H}\)

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Translation missing: es.pages.duct_pressure_loss_estimator.friction_loss_cal_dw_equation_txt_1 Translation missing: es.pages.duct_pressure_loss_estimator.friction_loss_cal_dw_equation_txt_2:

\[\Delta P_\text{ Translation missing: es.pages.duct_pressure_loss_estimator.friction } = f \cdot \frac{L}{D_h} \cdot \left(\frac{\rho V^2}{2}\right)\]

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  • \(\Delta P_\text{friction}\) = Translation missing: es.pages.duct_pressure_loss_estimator.ploss_friction [Pa]
  • \(f\) = Translation missing: es.pages.duct_pressure_loss_estimator.darcy_friction_factor
  • \(L\) = Translation missing: es.pages.duct_pressure_loss_estimator.length_duct [m]
  • \(D_h\) = Translation missing: es.pages.duct_pressure_loss_estimator.hydraulic_diameter_simple [m]
  • \(\rho\) = Translation missing: es.pages.duct_pressure_loss_estimator.air_density_simple [kg/m³]
  • \(V\) = Translation missing: es.pages.duct_pressure_loss_estimator.air_velocity_simple [m/s]
Translation missing: es.pages.duct_pressure_loss_estimator.friction_factor_heading (\(f\))

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  1. Translation missing: es.pages.duct_pressure_loss_estimator.friction_factor_txt_2 (Re): Translation missing: es.pages.duct_pressure_loss_estimator.friction_factor_txt_3

    \[\mathrm{Re} = \frac{\rho V D_h}{\mu}\]

    • Translation missing: es.pages.duct_pressure_loss_estimator.friction_factor_if (\(\mathrm{Re} \leq 2300\)), Translation missing: es.pages.duct_pressure_loss_estimator.friction_factor_txt_4 laminar \[f = \frac{64}{\mathrm{Re}}\].
    • Translation missing: es.pages.duct_pressure_loss_estimator.friction_factor_if (\(\mathrm{Re} > 4000\)), Translation missing: es.pages.duct_pressure_loss_estimator.friction_factor_txt_4 turbulent.
  2. Translation missing: es.pages.duct_pressure_loss_estimator.friction_factor_txt_5 \(\varepsilon / D_h\): Translation missing: es.pages.duct_pressure_loss_estimator.friction_factor_txt_6 \(\varepsilon\) Translation missing: es.pages.duct_pressure_loss_estimator.friction_factor_txt_7 \(D_h\).

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\[f = \frac{0.25}{\left[\log_{10}\!\left(\frac{\varepsilon}{3.7 D_h} + \frac{5.74}{\mathrm{Re}^{0.9}}\right)\right]^2}\]

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\[\Delta P_\text{ Translation missing: es.pages.duct_pressure_loss_estimator.dynamic } = K \cdot \left(\frac{\rho V^2}{2}\right)\]

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  • \(\Delta P_\text{ Translation missing: es.pages.duct_pressure_loss_estimator.dynamic }\) = Translation missing: es.pages.duct_pressure_loss_estimator.friction_factor_txt_11 [Pa]
  • \(K\) = Translation missing: es.pages.duct_pressure_loss_estimator.friction_factor_txt_12
  • \(\rho\) = Translation missing: es.pages.duct_pressure_loss_estimator.air_density_simple [kg/m³]
  • \(V\) = Translation missing: es.pages.duct_pressure_loss_estimator.friction_factor_txt_13 [m/s] Translation missing: es.pages.duct_pressure_loss_estimator.friction_factor_txt_14

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\[\Delta P_\text{ Translation missing: es.pages.duct_pressure_loss_estimator.friction } = \sum \Delta P_\text{ Translation missing: es.pages.duct_pressure_loss_estimator.friction } + \sum \Delta P_\text{ Translation missing: es.pages.duct_pressure_loss_estimator.dynamic }\]

Translation missing: es.pages.duct_pressure_loss_estimator.total_pressure_loss_txt_2 [Pa] Translation missing: es.pages.duct_pressure_loss_estimator.total_pressure_loss_txt_3 \[1~\text{Pa} \approx 0.00401463~\text{in. w.c.}\]

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Why Calculate Pressure Loss?

In any ventilation system, air encounters resistance as it flows through ducts, elbows, fittings, and other components. This resistance results in pressure loss that your fan must overcome. Accurate pressure loss calculation allows you to:

  • Select the appropriate fan with adequate static pressure
  • Optimize energy consumption by avoiding oversizing
  • Ensure airflow rates meet ventilation requirements
  • Reduce operating costs over the system's lifetime
  • Prevent` performance issues such as excessive noise or insufficient airflow

How Our Calculator Works

Our tool uses fundamental fluid mechanics principles and industry-recognized equations to provide reliable results:

Friction Losses

Friction losses are calculated using the Darcy-Weisbach equation, which accounts for:

  • Duct length and diameter
  • Material roughness (polypropylene, galvanized steel, etc.)
  • Air velocity and Reynolds number
  • Air density and viscosity

Dynamic Losses (Minor Losses)

Each change in direction or cross-section creates turbulence that dissipates energy. Our calculator includes loss coefficients (K-factors) for:

  • 90° and 45° elbows
  • Reducers and enlargements
  • T-junctions
  • Duct entries and exits
  • Grilles and dampers

Total Pressure Loss

The system automatically sums all losses (friction + dynamic) and provides the total static pressure required, expressed in Pascals (Pa) or inches of water column (in. w.c.).

Typical Applications

This calculator is particularly useful for sizing ventilation systems in:

  • Laboratories and fume hoods: Calculating losses in chemical fume extraction networks
  • Industrial facilities: Sizing corrosive vapor extraction systems
  • Cleanrooms: Optimizing ventilation networks to maintain differential pressures
  • Pharmaceutical facilities: Designing extraction systems compliant with GMP standards
  • Chemical plants: Calculating losses in ducts carrying aggressive gases

Selecting the Right Plastec Fan

When sizing your system with our calculator, remember that Plastec polypropylene fans offer significant advantages for corrosive environments:

  • Corrosion resistance: Non-metallic construction eliminating rust and chemical degradation
  • Lightweight design: Reduced structural loads and simplified installation
  • Durability: UV resistance with HALS additives, UL94-V0 flame retardant compliance
  • Smart controls: Integration with CONTROL E-SEAT, L.COM, and CAPTUR monitoring systems
  • Explosion-resistant options: Carbon-Impregnated Polypropylene (CIP) for hazardous locations
  • Quick delivery: Manufactured within 48 hours

How to Use the Calculator

1

Define your duct sections

Enter diameter (or rectangular dimensions), length, and material.

2

Add your fittings

Select the type and quantity of each fitting (elbows, tees, reducers, etc.).

3

Specify air conditions

Enter volumetric flow rate (CFM or m3/h), temperature, and altitude if necessary.

4

Get your results

The calculator displays losses per section, dynamic losses, and total system loss.

Technical Support and Fan Selection

Once pressure losses are calculated, our technical team can help you:

  • Select the optimal Plastec fan meeting your flow and pressure requirements
  • Verify compatibility with smart control systems (CONTROL E-SEAT, L.COM, CAPTUR)
  • Optimize configuration to maximize energy efficiency
  • Integrate monitoring via MODBUS for real-time supervision

Need Assistance?

Our team of experienced engineers is available to support you in your ventilation projects. Whether you need help interpreting calculator results or designing a complete system, we're here to help.

Contact us today to discuss your project and discover how Plastec Ventilation can optimize your corrosive ventilation systems.

Contact us

Additional Resources

For a complete ventilation solution, also discover our other tools:

  • Lab Fume Hood Flow Calculator: Quick airflow sizing for fume hoods
  • Fan Selection: Complete range of polypropylene fans and blowers
  • Technical Documentation: Installation guides and technical datasheets
  • Industry Applications: Solutions specific to your sector

Plastec Ventilation - Global leader in corrosion-resistant ventilation solutions with 20+ years of experience serving 80+ countries. Rapid manufacturing (48 hours) of polypropylene fans and blowers for demanding environments.

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