Noise efficiency of fan designs

In summary, the conversation discussed the noise produced by different types of fans, specifically compressor blades and household fans. It was mentioned that noise is often related to the velocity of the fan, with lower velocity resulting in less noise. Different fan designs, such as "waterwheel" and traditional designs, were also mentioned and their potential impact on noise and overall output.
  • #1
MisterX
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In particular I am wondering about compressor blades, but it's an interesting question to pose for household type fans as well. We can imagine "waterwheel" type schemes, and also the more traditional schemes where the axis of rotation is parallel to the flow. Which produces more noise per airflow? Also are there consequences of the various designs in terms of overall output?
 
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  • #2
Typically, noise is a function of velocity. So to move the same amount of air with low velocity, use a larger fan and make it spin slower. Similar issue exists for generating pressure (generating pressure requires high velocity).
 

1. What is noise efficiency and why is it important in fan designs?

Noise efficiency refers to how effectively a fan design can reduce the amount of noise it produces while still maintaining its performance. It is important in fan designs because excessive noise can be disruptive and unpleasant, especially in settings such as offices, homes, and hospitals.

2. How is noise efficiency measured in fan designs?

Noise efficiency is typically measured in decibels (dB), which is a unit of sound pressure. The lower the decibel level, the quieter the fan. In fan designs, noise efficiency is usually measured at a specific distance from the fan, such as 1 meter or 3 feet away.

3. What factors affect the noise efficiency of fan designs?

The noise efficiency of fan designs can be affected by various factors, such as the fan's motor, blade design, airflow, and housing. The fan's speed and the surrounding environment can also impact its noise efficiency.

4. Are there any industry standards or guidelines for noise efficiency in fan designs?

Yes, there are industry standards and guidelines for noise efficiency in fan designs. For example, the Air Movement and Control Association (AMCA) has established standards for measuring and reporting fan noise. Additionally, some countries have regulations for maximum allowable noise levels in certain settings, such as residential areas.

5. Can noise efficiency be improved in existing fan designs?

Yes, noise efficiency can be improved in existing fan designs through various methods. These include using noise-reducing materials in the fan's construction, optimizing the fan's motor and blade design, and implementing vibration-reducing techniques. Regular maintenance and cleaning can also help improve the noise efficiency of a fan over time.

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