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Mitigating particulate matter exposure in naturally ventilated buildings during haze episodes

机译：减轻雾霾发作期间自然通风的建筑物中的颗粒物暴露

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摘要

The effectiveness of a low energy fan-filter unit (FFU) in mitigating human. exposure to airborne particulate matter (PM) during haze episodes in a naturally ventilated hostel room is presented. The study adopts a case reference method by conducting a series of field tests in a test room equipped with FFU and in a reference room with no FFU. PM concentrations were monitored simultaneously indoors and outdoors; including mass concentrations of PM10, PM2.5 and PM1 as well as differential number concentrations of particles ranging from 0.35 mu m to 12.5 mu m. On average the FFU system reduced PM10, PM2.5, and PM1 particle concentrations by 80.9%, 80.4% and 78.5% respectively inside the test room relative to ambient air concentrations on a real-time comparison basis. The use of FFU operating with a MERV 13 filter during haze episodes is also effective in reducing human exposure to PM-bound toxic trace elements (TrElems) in naturally ventilated indoor environments. The majority of the TrElems (As, Be, Cd, Co, Cr, Ni, Pb, Mn, Zn and Cu) Were reduced indoors with I/O ratio of much less than 1. Additionally, FFU demonstrates slight alleviation of thermal discomfort compared to the reference room (whose windows and doors were closed to prevent penetration of haze particles) and achieves thermal conditions within the 80%-90% in the adaptive thermal comfort zone described in ASHRAE Standard 55-2013. The improved thermal conditions with FFU is attributable to provision of increased air exchange (ACH of 4.1 h(-1)) to displace the indoor generated heat and moisture.
机译：低能耗风扇过滤器单元（FFU）在缓解人体疾病方面的功效。介绍了在自然通风的宿舍房间内在霾发作期间暴露于空气中的颗粒物（PM）的情况。该研究采用案例参考方法，即在配备FFU的测试室和没有FFU的参考室中进行一系列现场测试。在室内和室外同时监测PM浓度；包括PM10，PM2.5和PM1的质量浓度，以及0.35微米至12.5微米范围内不同数量的颗粒浓度。平均而言，相对于周围空气浓度，FFU系统平均可将测试室内的PM10，PM2.5和PM1颗粒浓度分别降低80.9％，80.4％和78.5％。在雾霾发作期间，使用带有MERV 13过滤器的FFU还可有效减少人体在自然通风的室内环境中与PM结合的有毒微量元素（TrElems）的暴露。在室内，大多数TrElem（As，Be，Cd，Co，Cr，Ni，Pb，Mn，Zn和Cu）的还原度均小于1。此外，与FFU相比，FFU略微减轻了热不适感进入参考室（关闭门窗以防止雾霾颗粒渗透），并达到ASHRAE标准55-2013中所述的适应性热舒适区中80％-90％的热条件。用FFU改善的热条件归因于提供了更多的空气交换（ACH为4.1 h（-1）），以取代室内产生的热量和水分。

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