- Developed over the last decade, AcousticCalc helps designers predict sound levels at the room level from a distant sound source. The program uses the ASHRAE Handbook and ASHRAE's 1991 Algorithms for HVAC Acoustics handbook methods with the 'Source-Path-Receiver' model. This easy-to-use Windows-based program allows a user to define and save unlimited number of sound sources.
- Find Lindab's ventilation products. Calculate diffusers, chilled beams, dampers, silencers, fans & ducts leakage. Create wiring schemes and simulate your indoor climate. Save & share your projects.
- Sound Attenuator Selection Software and Acoustical Duct System Analysis Register: Sound Attenuator Selection Software and Acoustical Duct System Analysis Kinetics Noise Control, Inc. Can save you time and money by working with you to design economically quiet duct systems.
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Duct System Design Guide First Edition ©2003 McGill AirFlow Corporation McGill AirFlow Corporation One Mission Park Groveport, Ohio 43125 Duct System Design. The data for the calculations is extracted from the drawing and the calculations performed via items on the Utilities Menu. The overall results including duct sizes, pressure drops terminal NR levels, damper out-of-balance pressures and noise levels at selected frequencies can all be displayed on screen on the actual duct layout drawing. Daisy powerline 1000 owners manual.
The velocity reduction method can be used for sizing air ducts
The Velocity Reduction Method can be used when sizing air ducts. The method can be summarized to
- Select suitable velocities for main and branch ducts from the table below
- Find the sizes of main and branch ducts from the air flow rates and the velocities by using eq. 1 and the charts below
- From velocities and duct dimensions - find the frictional pressure loss in the main and branch ducts using the friction chart below
- Add minor dynamic loss
Proper Velocities
A proper velocity depends on application and environment. The table below indicate commonly used velocities:
| Type of Duct | Comfort Systems | Industrial Systems | High Speed Systems | |||
|---|---|---|---|---|---|---|
| m/s | ftm | m/s | ftm | m/s | ftm | |
| Main ducts | 4 - 7 | 780 - 1380 | 8 - 12 | 1575 - 2360 | 10 - 18 | 1670 - 3540 |
| Main branch ducts | 3 - 5 | 590 - 985 | 5 - 8 | 985 - 1575 | 6 - 12 | 1180 - 2360 |
| Branch ducts | 1 - 3 | 200 - 590 | 3 - 5 | 590 - 985 | 5 - 8 | 985 - 1575 |
Be aware that high velocity close to outlets and inlets may generate unacceptable noise.
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Velocities commonly used for different applications:
- upstream medium pressure VAV boxes: 2000 to 2500 fpm (10 - 13 m/s)
- transport of fumes, mist or very light particulates: 2400 fpm (12 m/s)
- dust collection systems with small particulate: 3500 fpm (18 m/s)
- dust collection systems with heavy particulate like metals: 5000 fpm (25 m/s)
Sizing Ducts
Sizes of ducts are then given by the continuity equation like:
A = q / v (1)
where
A = duct cross sectional area (m2)
q = air flow rate (m3/s)
v= air speed (m/s)
Alternatively in Imperial units
Ai = 144 qi / vi (1b)
where
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A = duct cross sectional area (sq.in.)
q = air flow rate (cfm)
v= air speed (fpm)
Frictional Pressure Loss
404bypass 1 0 4 – redirection made easy home. Estimate friction loss in main and branch ducts from the charts below:
Pagico 7 5 build 1900 download free. Air Ducts Sizing Spreadsheet Template
Air Ducts Spreadsheet Template - The Velocity Method
The velocity method can be done manual or more or less semi automatic with the spreadsheet template below.
This template is based on the in the spreadsheet. Customize sections, airflows, duct sizes and minor dynamic loss coefficients - add pressure loss paths and evaluate and reconfigure the system to fit your criteria. Summarize pressure loss for each path and add damper pressure losses manually to balance the system. https://cooldfiles730.weebly.com/vce-reader-for-mac.html.
The Google Docs spreadsheet template can be opened and copied here! The spreadsheet can also be downloaded as an excel file. Use the Google Docs 'File' menu on the top of the template. Outkast stankonia zip rar free.
Insert air ducts to your Sketchup model with the Engineering ToolBox Sketchup Extension
Related Topics
- Ventilation - Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more
Related Documents
Duct Acoustic Calculation Software Pdf
- Air Ducts - Friction Loss Diagram - A major loss diagram for air ducts - Imperial units ranging 10 - 100 000 cfm
- Air Ducts - Sizing - Air flow and required duct area
- Air Ducts - Velocity Diagram - Air flow volume, duct size, velocity and dynamic pressure
- Design of Ventilation Systems - Design procedure for ventilation systems - air flow rates, heat and cooling loads, air shifts according occupants, air supply principles
- Duct Sizing - Equal Friction Method - The equal friction method for sizing air ducts is easy and straightforward to use
- Duct Velocity - Calculate velocities in circular and rectangular ducts - imperial and SI-units - online calculator
- Ducts - Diameter and Cross-Sectional Area - Circular ducts and cross-sectional areas
- Ductwork Support - Ductwork support and recommended distance between hangers
- Dynamic Pressure - Dynamic pressure is the kinetic energy per unit volume of a fluid
- Equation of Continuity - The Equation of Continuity is a statement of mass conservation
- Equivalent Diameter - Rectangular and Circular HVAC Ducts - Equivalent diameter for rectangular and circular ducts - air flows between 100 - 50000 cfm
- Friction Head Loss in Air Ducts - Online Calculator - Head loss or major loss in air ducts - equations and online calculator for rectangular and circular ducts - Imperial and SI units
- HVAC Abbreviations - Commonly used HVAC abbreviations
- Noise Generated in Air Ducts - Noise generated form air flow in ducts
- Pressure Classifications of Duct Systems - Duct systems are commonly divided into three pressure classifications
- Sizing Circular Ducts - A rough guide to maximum air volume capacity of circular ducts in comfort, industrial and high speed ventilation systems
- Spiral Ducts - Dimensions - Standard dimensions of spiral ducts - Imperial units
- Typical Air Duct Velocities - Typical air duct velocities in applications like ventilation systems or compressed air systems
- Velocity Classification of Ventilation Ducts - Recommended air velocities in ventilation ducts
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