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
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.
Fans - generated Noise Power
The sound generated by a fan depends on the motor power, the volume capacity, the static pressure increase and the discharged volume.
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 from sources like fans, jet engines, cars, humans and more.