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DIY爱好者发明大炮“安静版本”

我最近收到住在北京Bill的邮件。他用DIY大炮减少家里的颗粒污染。

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但是他像我一样想降低大炮的噪音。

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所以Bill用了DIY精神来设计一个“静音版本”。他用塑料方块制造了一个箱子,将噪音挡在里面。

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箱子前后端有开口,帮助通风,虽然我猜这样做可能会降低几个百分点的净化效果。为进一步降低噪音,他在里面还用了被子盖上风扇。

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结果噪音降低6 dB!这区别多大?如果你已经有大炮,低档噪音是52 dB。作为比较,Bill大炮的高档噪音比这个低2 dB。确实挺安静的!

如果你对用Bill的设计感兴趣,我建议关注两点:

  1. 这个设计应该会有点减少空气的流通性。我猜总体效果会降低至少几个百分点,但是要做比较测试后才能确知。
  2. 要注意避免风机超热。设计完了之后,先开高档看看温度。

支持Bill的作业!

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Noise

对不起,此内容只适用于美式英文。 For the sake of viewer convenience, the content is shown below in the alternative language. You may click the link to switch the active language.

The new Cannon kicks butt (scientific definition of kicking butt), but it’s noisier than the Original DIY. How noisy is it? As is my habit, I wanted to answer this question scientifically.

So I bought a decibel meter:

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And I tested the Cannon, Original DIY, Blue Air 203/270E, and IQ Health Pro Plus on their highest settings from 1.95 meters away. Here are the results:

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The cannon is noisier than I’d like, but it’s similar to the Blue Air on the high setting. To give you an idea of how loud that is, this decibel chart says that’s between “conversation at home” and “conversation in restaurant.”

It’s still louder than I’d like, but fortunately I’ve found that the Cannon is still very effective on the lower settings:

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So I recommend running the cannon on a lower setting if you find it noisy.

Conclusions: 

  1. Cannon-owners can use the lower settings without sacrificing much performance.
  2. For people who are particularly sensitive to noise, the Original may be a better choice.
  3. For people who are VERY sensitive to noise, the Philips AC4072is expensive (2,700 RMB), but it’s quite quiet on the low setting.

As always, I’m posting the data and methods below for fellow nerds.

(更多…)