Evaluation of characterization and filtration performance of air cleaner materials

Zhou, Zeng; Zhou, Binbin; Tseng, Chao Heng; Hu, Shih−Cheng; Shiue, Angus; Leggett, Graham

doi:10.1007/s13762-020-02966-9

Cited by 7 publications

(7 citation statements)

References 37 publications

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“…The corresponding curve between flow and pressure was a ‘wet curve’, and a dry test was conducted to obtain a ‘dry curve’. The two curves and semi-dry curves show the pore characteristics of the sample, and the cumulative distribution curve of the pore size can be calculated by accumulating the flow [ 22 , 23 ]. The average pore size and pore size distribution of MBs are shown in Table 3 .…”

Section: Resultsmentioning

confidence: 99%

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Improvement of Polytetrafluoroethylene Membrane High-Efficiency Particulate Air Filter Performance with Melt-Blown Media

Shim

Jang

Moon³

et al. 2021

Polymers

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Polytetrafluoroethylene (PTFE) membrane filters are widely used in low-load application areas, such as industrial cleanrooms, due to their low initial pressure drop. In this study, melt-blown (MB) nonwoven was introduced as a pre-filtration layer at the front end of a high-efficiency particulate air (HEPA) filter to improve the filter performance of the PTFE membrane. Pre-filtration reduces the average particle size, which reaches the PTFE membrane and reduces the dust load on the HEPA filters. A comparative analysis of the HEPA filters by composite MB and PTFE was conducted. Regarding the MB composite on the PTFE, low-weight and high-weight MB composites were effective in increasing dust filtration efficiency, and the dust loading capacity of the PTFE composite with high-weight MB increased by approximately three times that of the PTFE membrane. In addition, the filter was installed on an external air conditioner in an actual use environment and showed a high efficiency of 99.984% without a change in differential pressure after 120 days.

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Section: Resultsmentioning

confidence: 99%

“…Conventional PTFE HEPA filters provide high particle removal efficiency. However, filter design must consider such that the pressure drop can increase quickly as accumulated particles clog the filter pores [ 23 , 26 , 27 ].…”

Section: Resultsmentioning

confidence: 99%

Improvement of Polytetrafluoroethylene Membrane High-Efficiency Particulate Air Filter Performance with Melt-Blown Media

Shim

Jang

Moon³

et al. 2021

Polymers

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“…To achieve the required fiber diameter and filter performance, PP is typically melt-blown. , In the melt blowing process, as seen in Figure S1 (Supporting Information), a polymer is extruded through small-diameter holes (0.2–1 mm) with L/D (length/diameter) ratios on the order of 10–30 and hole densities of 50–500 holes per centimeter. ,, Hot air is blown on either side of the extrusion point and stretches the fibers as they are collected against a mesh conveyor belt. Fibers undergo extreme elongation (factors on the order of 250) and cooling (10 3 °C/s). , Filtration occurs by the following four major mechanisms: inertial impaction, interception, diffusion, and electrostatic interaction. − The formation of smaller fibers as well as thicker and denser matts will improve all filtration characteristics, except electrostatic interaction, and generally increase the pressure drop. ,, An electret is an electric analog of a magnet and creates a permanent electric field. The formation of electrets in fibrous filter media creates the ability to significantly enhance filtration efficiency without increasing the pressure drop.…”

Section: Introductionmentioning

confidence: 99%

Polymer, Additives, and Processing Effects on N95 Filter Performance

Larsen

Cheng

Daemen

et al. 2021

ACS Appl. Polym. Mater.

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The current severe acute respiratory syndrome coronavirus 2 (SARS-COV-2) pandemic has highlighted the need for personal protective equipment, specifically filtering facepiece respirators like N95 masks. While it is common knowledge that polypropylene (PP) is the industry standard material for filtration media, trial and error is often required to identify suitable commercial precursors for filtration media production. This work aims to identify differences between several commercial grades of PP and demonstrate the development of N95 filtration media with the intent that the industry partners can pivot and help address N95 shortages. Three commercial grades of high melt flow index PP were melt blown at Oak Ridge National Laboratory and broadly characterized by several methods including differential scanning calorimetry (DSC), X-ray diffraction (XRD), and neutron scattering. Despite the apparent similarities (high melt flow and isotacticity) between PP feedstocks, the application of corona charging and charge enhancing additives improve each material to widely varying degrees. From the analysis performed here, the most differentiating factor appears to be related to crystallization of the polymer and the resulting electret formation. Materials with higher crystallization onset temperatures, slower crystallization rates, and larger number of crystallites form a stronger electret and are more effective at filtration.

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“…However, the above researches focus primarily on the effect of a single factor on the capture efficiency and pressure drop, such as the analysis of air velocity, particle diameter and shape of fibrous media. [40][41][42][43][44] It is more effective to combine all of these important parameters (fluid velocity and viscosity, particle diameter and density and fiber size, etc.) into single dimensionless numbers to evaluate the filtration performance of multi-fiber filters, and consequently, an optimal strategy can be developed by integrating different methods.…”

Section: Introductionmentioning

confidence: 99%

Dimensionless study of the fiber arrangement on particle filtration characteristics in a multi-fiber filter

Fan,

Yang,

Zhang

et al. 2023

Journal of Industrial Textiles

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In this paper, two-dimensional numerical simulations are performed to investigate the particle filtration performance of multi-fiber filters using computational fluid dynamics ( CFD) technology. We combine fluid and particle properties as well as fiber size into single dimensionless numbers to analyze the influence of fiber arrangements on the system pressure drop and capture efficiency during the filtration process. The results indicate that the motion and deposition of aerosol particles significantly depend on the combined effects of Brownian diffusion, interception and inertial impaction mechanisms. The capture of aerosol particles with diameters less than 0.1 [Formula: see text] is strongly determined by the Brownian diffusion mechanism. For the case where interception and inertia impaction mechanisms dominate, particles with diameters in the range of 1–10 [Formula: see text] are more easily captured. In addition, the filter with a staggered fiber array structure exhibits a higher capture efficiency than that of parallel and random cases. From the quality factor standpoint, filters with both the staggered and random fiber arrangements show a better filtration performance. The research results can provide a fundamental understanding of the particle filtration process and the theoretical basis for filter design and optimization.

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Evaluation of characterization and filtration performance of air cleaner materials

Cited by 7 publications

References 37 publications

Improvement of Polytetrafluoroethylene Membrane High-Efficiency Particulate Air Filter Performance with Melt-Blown Media

Improvement of Polytetrafluoroethylene Membrane High-Efficiency Particulate Air Filter Performance with Melt-Blown Media

Polymer, Additives, and Processing Effects on N95 Filter Performance

Dimensionless study of the fiber arrangement on particle filtration characteristics in a multi-fiber filter

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