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Dry Aerosol Coating of Anti-viral Particles on Commercial Air Filters Using a High-volume Flow Atomizer

Category: Control Techniques and Strategy

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DOI: 10.4209/aaqr.2019.04.0212
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Dae Hoon Park1, Yun Haeng Joe2, Jungho Hwang 1

  • 1 School of Mechanical Engineering, Yonsei University, Seoul 03722, Koreav
  • 2 Climate Change Research Division, Korea Institute of Energy Research, Daejeon 34129, Korea

Highlights

  • High-volume flow atomizer (over 200 L min–1) was designed and fabricated.
  • The atomizer had 8.5 times higher particle generation rate than TSI 9302 atomizer.
  • Commercial air filter unit was coated with SiO2-Ag NPs by dry aerosol-coating method.
  • Performance evaluation of the fabricated anti-viral filter was carried out.

Abstract

Filtration is a common air cleaning technique used to remove airborne particulates. However, microorganisms can survive and multiply on the filter surface of heating, ventilating, and air-conditioning systems. These multiplied microorganisms eventually disperse in air. The most conventional method used for coating pristine air filter media with anti-viral material is wet coating using the solution process method, wherein the filter media needs to be soaked in a solution containing a large amount of dispersed anti-viral material, followed by a dry process comprising heated air flow. However, using heated air flow requires additional cost with respect to time and energy and often causes deformation of the filter material. In contrast, the aerosol-coating method is a dry process, wherein aerosolized anti-viral material can be directly deposited onto the filter media under atmospheric pressure and room temperature conditions. In this work, we design a laboratory-made atomizer to generate aerosol particles of high concentration at high flow rate conditions (over 200 L min-1). The generated anti-viral material (SiO2–Ag nanoparticles) with liquid droplets are dried through sheath air flow and utilized to directly coat a commercial air filter unit. The fabricated anti-viral filter is evaluated for filtration and anti-viral activity against aerosolized bacteriophage MS2.

Keywords

High-volume flow atomizer Air filter Anti-viral Dry aerosol coating


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