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大炮能够净化多大的房间?

我测试所有能找到平面的风扇之后,

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……当中一台最突出。因为它独特的样子和它非常好的效果,我决定叫它“大炮”。

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在15m2的北京公寓,大炮大量地消除了颗粒,连很小的0.5微米颗粒也降低97%

但是在更大的房间内,效果怎么样?一般大的公司会用风量来算适用面积,但是这种算法会受到房子密封性和外面空气的污染程度的影响。因为中国的空气更脏,我觉得有必要在真实条件下做测试。

方法

幸亏我搬到大的四居室公寓,包括30.5m2的客厅。在这个客厅,我做了6次大炮高档测试。我用了激光测试仪来测试颗粒污染。每次测试持续了至少3个小时。

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我算了大炮从测试开始到最后一个小时消除百分之多少颗粒。

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这次测试跟之前做的测试有比较重要的区别:

  1. 这些测试是白天做的。很多人觉得PM 2.5是晚上最低,因为开车的人少(不过这个想法是错的,数据显示PM 2.5是晚上最高)。
  2. 这些测试是在人走动和开门的时候做的。这个比睡觉的时候的测试更保守,因为大炮要克服开门进来的脏空气。

结果

通过6次测试,即使有人走动和开门,大炮消除了92%的0.5微米颗粒和89%的2.5微米颗粒。

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这次测试有一个小意外:0.5微米的效果稍微比2.5微米效果要高。在之前做的测试,一般0.5微米的效果会低一点。我猜这是因为测试的时候有人走动,而走动对大颗粒的影响更大。

结论

大炮至少净化30.5m2的房间。这个比 3,6000元的Blue Air 203适用面积(22.3m2)要大。

跟之前一样,为了其他书呆子同胞们,我在贴子下面发布原始数据。

(更多…)

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Independent Tests

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.

Beijing-based Dr. Saint Cyr’s tests of air purifiers were one of my original inspirations for the whole DIY project, so I was happy to see that the DIY recently became a part of those tests:

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These are the first independent tests of the DIY, and the results parallel mine. You could also include the tests by doctors at the University of Michigan as independent  “proof of principle,” although they used a different fan and filter. The commonality is that all of the tests have shown that a simple filter and a fan can reduce particulate pollution in the home.

Dr. Saint Cyr’s review isn’t all glowing. He rightly notes that the cannon is noisy, which I’ve also written about (decibel counts and comparisons here). Tests show the cannon is still very effective on the lower settings, so I recommend running the cannon on the somewhat quieter settings. And for people who are sensitive to noise, I recommend the quieter Original.

Saint Cyr writes that we’re still in the early rounds of our design, and I think that’s right. In fact, we’re working on a new model that keeps the high performance with less noise. I’ll be posting more data on that in the coming months.