Abstract

The benefits of nanofibrous media have been extensively explored in laboratory-scale research but are less clear in real filtration applications. Thus, this study investigated the links between the size-resolved filtration efficiency of nanofibrous media mounted in portable air cleaners in a chamber test and results from the media mounted in a cone-shape filter holder in a more conventional duct test. Results showed a similar trend for the filtration efficiency curves for these two experimental tests, despite differences in test type, challenge aerosol, instrumentation, and the calculation of filtration efficiency. Long-term operation, surface area blockage, and isopropyl alcohol treatment adversely impacted the filtration efficiency of the tested nanofibrous media in the chamber test, with a different magnitude of impact for three different media tested. The filtration efficiencies were lower than most of the previously reported data in the literature, which may be due to the differences in medium type, fiber diameter, filter thickness, porosity, face velocity, filter charge, and the number of filter layers. This study suggests the needs for determining the performance of nanofibrous media in terms of filtration efficiency and quality factor in real environmental systems.

Copyright © 2021 American Association for Aerosol Research

摘要

纳米纤维介质的好处已在实验室规模的研究中得到广泛探索，但在实际过滤应用中却不太清楚。因此，本研究调查了在腔室测试中安装在便携式空气净化器中的纳米纤维介质的尺寸分辨过滤效率与在更传统的管道测试中安装在锥形过滤器支架中的介质的结果之间的联系。尽管测试类型、挑战气溶胶、仪器和过滤效率计算存在差异，但结果显示这两个实验测试的过滤效率曲线具有相似的趋势。长期运行、表面积堵塞和异丙醇处理对腔室测试中被测纳米纤维介质的过滤效率产生不利影响，测试的三种不同介质具有不同程度的影响。过滤效率低于文献中先前报道的大多数数据，这可能是由于介质类型、纤维直径、过滤厚度、孔隙率、面速度、过滤电荷和过滤层数的差异。这项研究表明，需要根据实际环境系统中的过滤效率和质量因素来确定纳米纤维介质的性能。

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