Abstract
The study aims at lowering the pressure drop and extending the service life at a given set of filter materials implementing a space between the filter layers. As design factors, the web-to-web space was implemented by inserting either a bulk air gap or porous spacer web between the filter webs. The effect of spacing, either by the air gap or by the spacer web, on the pressure drop reduction was apparent for 4-layer constructions, and the effect was greater at the higher face velocity. The use of spacer web was more effective than the air gap in reducing the pressure drop, because the porous, fluffy spacer web acted as an effective air flow channel between the compact filter layers. The loading capacity was also increased with the spacer web implementation, effectively delaying the clogging point and extending the service life. Employing both experimental investigation and numerical simulation, this study intended to provide a practical design solution to the important problem in the field of air filtration. The results of this study can be used as a practical design guide to reduce pressure drop via depth filtration.
Highlights
Particulate matter (PM), consisting of solid particles, liquid aerosol, and gas and vapor compounds [1,2,3], is often classified by its aerodynamic diameter
While the conventional high efficiency particulate air (HEPA) filters provide very high removal efficiency, at the filter design, it should be considered that the pressure drop can increase quite steeply as the accumulated particles clog the pores of the filter [20,21,22]
In terms of quality factor (QF), a higher value of QF is desirable as it means higher filtration efficiency, or lower particle penetration, at the unit pressure drop
Summary
Particulate matter (PM), consisting of solid particles, liquid aerosol, and gas and vapor compounds [1,2,3], is often classified by its aerodynamic diameter. To manufacture conventional fiber-based filter media, the meltblown nonwoven process is typically employed using a polypropylene polymer [16]. High efficiency particulate air (HEPA) filters are used to provide maximum filtration performance for the most penetrating particle size, 0.1~0.5 μm count median diameter (CMD) [17,18,19]. While the conventional HEPA filters provide very high removal efficiency, at the filter design, it should be considered that the pressure drop can increase quite steeply as the accumulated particles clog the pores of the filter [20,21,22]. In terms of QF, a higher value of QF is desirable as it means higher filtration efficiency, or lower particle penetration, at the unit pressure drop
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