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Research Article

Design and performance of a novel miniaturized electrostatic sampler for efficient airborne particulate matter sampling

Xihui Liu2, Yan Wang2, Yilun Gao2, Cong Liu3(), Jinhan Mo1,2,4,5()
College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Department of Building Science, Tsinghua University, Beijing 100084, China
School of Energy and Environment, Southeast University, Nanjing 210096, China
Key Laboratory of Coastal Urban Resilient Infrastructures (Shenzhen University), Ministry of Education, Shenzhen 518060, China
Key Laboratory of Eco Planning & Green Building (Tsinghua University), Ministry of Education, Beijing 100084, China
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Abstract

Considering that people spend more than 80% of their time indoors, ambient particulate matter (PM) in the built environment could pose severe environmental health risks to public health. PM sampling, a technique for the enrichment of PM in the air, is essential for ambient PM composition analysis to understand its environmental and health effect. The filtering method that is widely used features a complex post-processing and carries the risk of pore clogging. It is a great challenge to sample airborne PM efficiently for subsequent analysis. Here, we proposed a novel miniaturized electrostatic sampler based on corona discharge and a modified vertically focused electric field for efficient PM sampling. Four intercoupling physical fields in the developed sampler were analyzed, including corona discharge, airflow, particle charging and particle deposition. The collection efficiencies for particles with various sizes (0.01–10 μm) were conducted by simulation and the lowest efficiency occurs at about 0.3–0.5 μm. With an increase in discharging voltage from −6 kV to −9 kV, the lowest efficiency rises from 88.2% to 96.6%. An electrostatic sampler entity was manufactured to test the collection efficiency of PM and the results are in good agreement with the simulation. The induced ring plate can significantly improve the total collection efficiency from 35% to 90% under −6 kV discharging voltage in the experiment. The novel electrostatic sampler exhibits potential and enlightenment for efficient and convenient PM sampling.

Keywords

particulate matterelectrostatic PM samplerelectric fieldparticle charging

Electronic Supplementary Material

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Building Simulation
Volume 16 Issue 8,
August 2023
Pages 1439-1450
DOI: 10.1007/s12273-023-1059-4
Cite this article:
Liu X, Wang Y, Gao Y, et al. Design and performance of a novel miniaturized electrostatic sampler for efficient airborne particulate matter sampling. Building Simulation, 2023, 16(8): 1439-1450. https://doi.org/10.1007/s12273-023-1059-4
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