◆High filtration efficiency, but not blindly improve efficiency
◆ low resistance
◆ large dust capacity
◆ price is cheap and environmentally friendly
Test instrument and procedure
*main technical parameters of EN779 test board
item | parameter |
Test condition | Temperature 10-38 ºC Humidity 20-60% |
Air volume range | 300-5400m3/h |
Resistance range of the filter to be measured
| 0-600Pa |
System air temperature and humidity range | -40°C～60ºC 0～100% RH |
Test size range | 0.2-3.0μm(EN779) 0.3- 10μm(ASHRE 52.2) |
Test aerosol | DEHS |
The loading of dust | ASHRAE dust |
Test result
Physical performance
material | Character | gsm | Thickness (um) |
A | 60G-A4 | 60 | 400 |
B | HY-25-99% | 30 | 250 |
C | M26161-A4 | 30 | 190 |
Resistance
material | resistanceΔP（Pa） |
A | 77.5 |
B | 110 |
C | 130 |
filtration efficiency comparison
300 times SEM
1000 times SEM
Layered gradient ♠Many fine fibers, part of the silk structure,
♠Not enough three-dimensional porosity
has been formed,
♠High air resistance
3000 times SEM
1.Mean fiber diameter: A-7μm,B-5μm,C-5μm
2. B and C have the same average fiber diameter, fiber gram weight and filtration efficiency Similar, but the ΔP is quite different
Results analysis and summary
Quality factor( q f )=ln(1/P ) /ΔP
*particle size of A,B,C >=4μm, q f Of A,B,C=0.025,0.021 ,0.017
*The q f of material A, B and C to PM2.5 were respectively are 0.102, 0.077 and 0.066
*Basic weight (Gsm ) comparison :A>B=C
*Thickness comparison: A>B>C
*Resistance comparison: A<B<C
*Filtration efficiency comparison : A<B=C
Results analysis and summary
Quality factor( q f )=ln(1/P ) /ΔP
*The q f of material A, B and C to PM2.5 , A>B>C, A has best performance
*SEM analysis: A and B form three-dimensional mesh structure, A is coarse and fine fiber staggered structure, B is fine fiber uniform structure, material C There are many fine fibers, forming a planar structure .
*Haagen - Poiseuille law Δ P =8μHv/πr^4n
At a constant flow rate, The resistance is inversely proportional to r^4 . Therefore, the resistance of materials B and C is larger
Results analysis and summary
The realization of the combination of process A and process B is the future direction of technology development, A reflect the characteristics of low resistance and high efficiency, in a certain support strength, can support more three-dimensional space, improve the efficiency of dust and interception efficiency!
