Noise generated in Blade Dampers
Sound power noise generated by blade dampers in ventilation systems.
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 calculations. Noise Rating (NR) curves. Sound transmission through walls. Calculate 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.