Noise generated in Blade Dampers
The noise - sound power level - generated in single opposed blade dampers can be estimated from the chart below:
- 1 mm water H2O = 9.81 Pa = 9.81 N/m2 = 1 kg/m2 = 0.0736 mm mercury = 0.9677 10-4 atm = 0.00142 psi = 0.0394 in H2O
The noise level generated depends on the volume flow through the damper and can be corrected using the table below
| Volume Flow (m3/h) | Noise Correction (dB) |
|---|---|
| 100 | -10 |
| 200 | -7 |
| 500 | -3 |
| 1000 | 0 |
| 2000 | 3 |
| 4000 | 6 |
| 8000 | 9 |
| 16000 | 17 |
Related Topics
• Acoustics
Room acoustics and acoustic properties, decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation.
• Noise and Attenuation
Noise is usually defined as unwanted sound - noise, noise generation, silencers and attenuation in HVAC systems.
Related Documents
Fans - Noise Power Generation
The sound generated by a fan depends on the motor power, the volume capacity, the static pressure increase and the discharged volume.
HVAC Dampers - Pressure Loss
Pressure head loss in HVAC dampers.
Noise Attenuation in Rotary Heat Exchanges
Sound attenuation vs. frequency in rotating heat exchangers.
Signals - Adding Decibels
The logarithmic decibel scale is convenient when adding signal values like sound power, pressure and others from two or more sources.
Sound Intensity, Power and Pressure Levels
Introduction to decibel, sound power, intensity and pressure.
Sound Power
Sound power from sources like fans, jet engines, cars, humans and more.