Performance of nanofibrous media in portable air cleaners

Figures & data

Table 1. Specifications for three tested nanofibrous media.

Media	Polymer	Substrate	Basis weight (g/m^2)	Mean fiber diameter (nm)	Pressure drop (Pa)	Air permeability (m^3/m^2/min)
M1	PA6^a	Filter article corrugated	0.02	119	31	29.7
M2	PA6	Filter article corrugated	0.03	100	67.4	13.9
M3	PA6	Polyether sulfones (PES) spunbond	0.03	96	34	3.54

^a Polyamide 6.

Table 2. Experimental approach for Chamber Test (CT) and Duct Test (DT).

Purpose	Media	Test Type
Comparison/Sample variation	M1, M2, M3	CT^b, DT^c
Repeatability	M1, M2, M3	CT, DT
Media loading	M3	CT
Media discharge (IPA)^a	M1, M2, M3	CT, DT
Face velocity variation	M1, M2, M3	CT

^a Isopropanol alcohol.

^b Chamber test

^c Duct test

Figure 1. Schematic diagram of the Chamber Test (CT) apparatus for portable air cleaner media efficiency testing.

Figure 2. Schematic diagram of the Duct Test (DT) apparatus for media efficiency testing.

Figure 3. Filtration efficiency of (a) left column: three nanofibrous media in both Chamber Test (CT) and Duct Test (DT), (b) center column: three samples (A, B, C) from each nanofibrous media of M1, M2, M3 in Chamber Test, (c) right column: three samples (a–c) from each nanofibrous media of M1, M2, M3 in Duct Test. η_PM1 is the filtration efficiency based on the monitor-reported mass concentration of >1-micron particles.

Figure 4. Effects of three months of indoor particle loading (M3-D stands for the initial filter medium and M3-D-l stands for the final medium after long term operation) on filtration efficiency of M3 filter media in Chamber Test (CT). ηƞ_PM1 is the filtration efficiency based on the monitor-reported mass concentration of >1-micron particles.

Figure 5. Filtration efficiency of three filter media before and after exposure to IPA (shown with i in legend) for Chamber Test (CT, left column) Duct Test (DT, right column) for three different media samples (rows) η_PM1 is the filtration efficiency based on the monitor-reported mass concentration of >1-micron particles.