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Ultrafine particle removal and generation by portable air cleaners

机译：便携式空气滤清器去除和产生超细颗粒

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Portable air cleaners can both remove and generate pollutants indoors. To investigate these phenomena, we conducted a two-phase investigation in a 14.75m~3 stainless steel chamber. In the first phase, particle size-resolved (12.6-514nm diameter) clean air delivery rates (CADR) and efficiencies were determined, as were ozone emission rates, for two high-efficiency particle arresting (HEPA) filters, one electrostatic precipitator with a fan, and two ion generators without fans. The two HEPA air cleaners had count average CADR (standard deviation) of 188 (30) and 324 (44)m~3h~(-1); the electrostatic precipitator 284 (62)m~3h~(-1); and the two ion generators 41 (11) and 35 (13)m~3h~(-1). The electrostatic precipitator emitted ozone at a rate of 3.8±0.2mg h~(-1), and the two ion generators 3.3 + 0.2 and 4.3 + 0.2 mg h~(-1). Ozone initiates reactions with certain unsaturated organic compounds that produce ultrafine and fine particles, carbonyls, other oxidized products, and free radicals. During the second phase, five different ion generators were operated separately in the presence of a plug-in liquid or solid air freshener, representing a strong terpene source. For air exchange rates of between 0.49 and 0.96 h~(-1), three ion generators acted as steady-state net particle generators in the entire measured range of 4.61-157 nm, and two generated particles in the range of approximately 10 to 39-55 nm. Terpene and aldehyde concentrations were also sampled for one ion generator, and concentrations of terpenes decreased and formaldehyde increased. Given these results, the pollutant removal benefits of ozone-generating air cleaners may be outweighed by the generation of indoor pollution.
机译：便携式空气滤清器可以清除室内的污染物并产生污染物。为了研究这些现象，我们在14.75m〜3不锈钢室中进行了两阶段研究。在第一阶段中，对于两个高效的颗粒捕集（HEPA）过滤器，一个带电除尘器的静电除尘器，确定了粒径分离（直径为12.6-514nm）的清洁空气输送率（CADR）和效率，以及臭氧排放率。风扇和两个没有风扇的离子发生器。这两台HEPA空气净化器的平均CADR（标准差）为188（30）和324（44）m〜3h〜（-1）；静电除尘器284（62）m〜3h〜（-1）;两个离子发生器41（11）和35（13）m〜3h〜（-1）。静电除尘器以3.8±0.2mg h〜（-1）的速率释放臭氧，两个离子发生器分别为3.3 + 0.2和4.3 + 0.2 mg h〜（-1）。臭氧引发与某些不饱和有机化合物的反应，产生超细微粒，羰基，其他氧化产物和自由基。在第二阶段中，在插入式液体或固体空气清新剂（代表强萜源）的存在下，分别操作了五台不同的离子发生器。对于介于0.49和0.96 h〜（-1）之间的空气交换速率，三个离子发生器在整个4.61-157 nm的测量范围内充当稳态净粒子发生器，而两个离子发生器在大约10到39 nm的范围内起作用-55 nm。还为一台离子发生器采样了萜烯和醛的浓度，萜烯的浓度降低，甲醛增加。鉴于这些结果，产生室内空气污染可能会抵消产生臭氧的空气净化器在污染物去除方面的好处。

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