Simulation Study of a Novel Cylindrical Micro-Electrostatic Particulate Air Filter with High Filtration Efficiency and Low Resistance

Buildings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 465
Author(s):  
Junyi He ◽  
Junjie Liu ◽  
Lingchang Kong ◽  
Pan Wang ◽  
Xin Zhang
Keyword(s):  
Filtration Efficiency ◽  
Air Filter ◽  
Cylindrical Structure ◽  
Plate Structure ◽  
Energy Saving Potential ◽  
Filtration Performance ◽  
Aerosol Pollution ◽  
Electrostatic Filter ◽  
New Type ◽  
Improved Performance

The purification of indoor pathogenic microorganisms has become a topic of concern. The use of nonwoven media air filters causes high resistance, and the problem of noise limited their application under high air volume. Thus, we propose a micro-electrostatic filter, which has improved performance compared to an electrostatic filter, with a new type of cylindrical structure to tackle indoor pathogenic microbial aerosol pollution. Through simulation, it is found that the filtration performance of a cylindrical structure is better than that of a plate structure under all simulation conditions. For particles larger than 1 μm, the shortest theoretical length of the dust collecting plate required for the cylindrical structure is 34% shorter than that for the plate structure. For 0.1 μm particles, the filtration efficiency of the cylindrical structure is nearly 20~30% (the maximum value is 29.76%) higher than that of the plate structure, while the air velocity is 1.5 m/s~2.5 m/s. The resistance of the cylindrical micro-electrostatic filter is only half of that of the combined plate type micro-electrostatic filter, indicating that the cartridge structure has enormous energy-saving potential. The introduction of the quality factor further proves that the integrated filtration performance of the cartridge micro-electrostatic filter is better. The application of cylindrical micro-electrostatic filters in HVAC systems can help improve indoor air quality and reduce health risks.

Preparation and filtration performance of the circular weft-knitted seamless weft-insertion fabric materials

2019 ◽  
pp. 152808371985532 ◽  
Author(s):  
Fei Tian ◽  
Gaoming Jiang ◽  
Zhe Gao
Keyword(s):  
Pore Size ◽  
Production Efficiency ◽  
Filtration Efficiency ◽  
High Porosity ◽  
Filtration Performance ◽  
Air Particulate ◽  
Forming Technology ◽  
New Type ◽  
High Production ◽  
Fabric Materials

Air particulate matter pollution has become a severe environment concern calling for filtration materials with great filtration performance. As the development of seamless forming technology, knitted filtration materials gradually show great potential. This study aimed to develop a novel kind of knitted seamless structure for filtration materials of filter bags with high production efficiency and excellent filtration performance. A new type of the circular weft-knitted seamless weft-insertion fabric (CKSW) filtration materials were developed on the modified circular knitting machine. This CKSW filtration materials consisting of the ground yarns, connection yarns and weft-insertion yarns, polyester full drawn yarns, and polyester draw texturing yarns with different yarn configurations were employed to realize series of CKSW samples. The polytetrafluoroethylene filaments with tourmaline particles were used to verify whether the static electric material produced an adsorption filtration effect on the CKSW filtration materials or not. After pretreatment, the filtration performance of the CKSW filtration materials was evaluated by analyzing its pore size, porosity, and filtration efficiency. Ultimately, the CKSW filtration materials with ground yarns and weft insertion yarns of draw texturing yarn and the connection yarns of full drawn yarn exhibited the most excellent filtration performance. The CKSW filtration materials show a high porosity of 87.14%, the pore size of 67.55 µm, and good filtration efficiency of 91.57% with the particles size of ≥ 5.0 µm. The successful fabrication of such knitted filtration materials may provide ideas for the development of filtration materials with new architecture mainly used as filter bags for baghouse.

Oil-treated pleated fibrous air filters for motor vehicle engine intake application

2019 ◽  
Vol 234 (2-3) ◽  
pp. 702-713
Author(s):  
Ajay Kumar Maddineni ◽  
Dipayan Das ◽  
Ravi Mohan Damodaran
Keyword(s):  
Pressure Drop ◽  
Motor Vehicle ◽  
Life Time ◽  
Filtration Efficiency ◽  
Air Filters ◽  
Air Filter ◽  
Filtration Performance ◽  
Vehicle Engine ◽  
Air Intake ◽  
The Difference

In this work, oil-treated pleated fibrous air filters were developed, characterized, and evaluated for motorcycle engine intake application. The effect of pleat geometry on the filtration performance was examined. Pleat pitch and pleat height were found to play important roles in determining the filtration efficiency, pressure drop, and dust holding capacity. A pleated fibrous filter prepared with optimum levels of pleat pitch and pleat height showed the best filtration performance. The treatment to the pleated filter by viscous oil yielded remarkably higher dust holding capacity and filtration efficiency, both at cleaned and clogged conditions. A statistical analysis revealed that the weight of oil played a significant role in deciding the filtration performance. The oil-treated pleated filter was installed in a commercial air intake system and its filtration performance was assessed. The filter element displayed a significant delay in evolution of pressure drop during dust loading as compared to the untreated one. However, the difference in filtration efficiency between the oil-treated and untreated filter elements was not found to be too high. Nevertheless, both of them met the standard filtration performance as per the best practices followed by the automotive industry. Overall, the oil treatment to cellulosic filters was found to be highly advantageous for motorcycle application. Practical implications of such air filter system were discussed in terms of service life, fuel consumption, and CO2 emission during filter life time.

scholarly journals Filtration efficiency improvement of air filter paper for fine particles by electrospinning technology

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 5220-5233
Author(s):  
Weiyin Su ◽  
Lanfeng Hui ◽  
Xiaoyan Ma ◽  
Qian Yang ◽  
Wanhong Sun
Keyword(s):  
Pore Size ◽  
Filter Paper ◽  
Fine Particles ◽  
Filtration Efficiency ◽  
Research Progress ◽  
High Porosity ◽  
Air Filter ◽  
Filtration Performance ◽  
Initial Resistance ◽  
Good Filtration

Due to great advantages, such as simple operation, high porosity, and good fiber continuity, the working principle and research progress of electrospinning technology was studied and polyvinyl alcohol (PVOH) nanofibers were prepared via this process. Air filter paper was used as the receiving substrate to prepare electrospun nano air filter paper (NAFP). The PVOH concentration, static voltage, and receiving distance, were tested to explore the influence of spinning parameters on the filtration performance. Further, the microfiber morphology of the electrospun NAFP was observed. The performance of filter paper, including air permeability, pore size, initial resistance, filtration efficiency, and dust retention, were tested. The results showed that the electrospun NAFP had better filtration performance compared to the air filter paper, and simultaneously they had lower initial resistance and higher precision filtration efficiency. The nanofiber influenced the surface of the air filter paper, as it sharply reduced the pore size. When the spinning condition was 10%, 21 kV, and 15 cm, the pore size decreased approximately 0.6 times of the original, which meant the electrospun NAFP could capture particles ≥ 0.2 μm in size. Finally, after three repeated uses, the good filtration performance was maintained.

Penetration Performance of Melt-Blown Polypropylene Electret Nonwoven Web against DEHS Aerosols

2011 ◽  
Vol 393-395 ◽  
pp. 1318-1321 ◽  
Author(s):  
Hui Ming Xiao ◽  
Gang Jin Chen ◽  
Ye Ping Song
Keyword(s):  
Particle Size ◽  
Aerosol Particle ◽  
Chemical Properties ◽  
Filtration Efficiency ◽  
Air Filter ◽  
Filtration Performance ◽  
Aerosol Particle Size ◽  
The Stability ◽  
The Impact ◽  
Electrostatic Mechanism

High filtration efficiency of melt-blown polypropylene nonwoven web used as air filter extremely depends on its elelctret characteristics. In this paper, penetration performance of DEHS(diethyl hexyl sebacate) aerosol while flowing through melt-blown polypropylene electret nonwoven web is studied by the method of aerosol penetration measurement as a function of particle size, and the contribution of mechanical and electrostatic mechanism to its capture ability is proposed. The stability of filtration performance after exposure to DEHS for a period of time is measured and the impact of DEHS and other challenge aerosols with different chemical properties on filtration performance is compared. The results show that the higher filtration efficiency of melt-blown polypropylene electret nonwoven web mainly depends on its high electret charge. Aerosol penetration drops off with the increase of aerosol particle size and decreases in the order of basic weight sequence of 20, 40 and 60 g/m2. The most penetration particle size (MPPS) appears at 0.08 m in diameter. The electret charge of the web was cleared away during the course of exposure to challenge aerosol after 5 minutes. The electriferous property of aerosol particle also influences the filtration performance of polypropylene electret nonwoven web. The electret web displays the best filtration performance for ionized aerosol.

scholarly journals Antimicrobial Air Filters Using Natural Sea Salt Particles for Deactivating Airborne Bacterial Particles

2019 ◽  
Vol 17 (1) ◽  
pp. 190
Author(s):  
Sang Bin Jeong ◽  
Ki Joon Heo ◽  
Byung Uk Lee
Keyword(s):  
Escherichia Coli ◽  
Environmental Exposure ◽  
Staphylococcus Epidermidis ◽  
Deposition Time ◽  
Filtration Efficiency ◽  
Sea Salt ◽  
Air Filters ◽  
Air Filter ◽  
Aerosol Process ◽  
Microbial Contaminants

We developed an antimicrobial air filter using natural sea salt (NSS) particles. Airborne NSS particles were produced via an aerosol process and were continuously coated onto the surface of an air filter under various deposition times. The filtration efficiency and bactericidal performance of the NSS-coated filter against aerosolized bacterial particles (Staphylococcus epidermidis, Escherichia coli) were evaluated quantitatively. The filtration efficiency of the tested filter ranged from 95% to 99% depending on the deposition time, and the bactericidal performance demonstrated efficiencies of more than 98% against both tested bacterial bioaerosols when the NSS deposition ratio was more than 500 μg/cm2. The experimental results indicated that the NSS-coated filters have the potential to be used as effective antimicrobial air filters for decreasing environmental exposure to microbial contaminants.

Rotor Design and Optimization in Internal Lobe Pumps

1997 ◽  
Vol 50 (11S) ◽  
pp. S133-S141 ◽  
Author(s):  
Giovanni Mimmi ◽  
Paolo Pennacchi
Keyword(s):  
Flow Rate ◽  
Performance Comparison ◽  
Definite Function ◽  
Pump Design ◽  
Design And Optimization ◽  
Performance Indexes ◽  
New Type ◽  
Improved Performance ◽  
Lobe Pump ◽  
Rotor Curvature

The topic of this paper is the design of internal lobe pumps and their optimization which is based on specific performance indexes. Internal lobe pumps can be classified as different types depending on the shape of the lobe of the outer rotor. First, the design of internal lobe pumps with elliptical, sinusoidal, and polycircular lobe profiles is considered. The latter is a new type of lobe profile with special shape whose curvature follows a definite function. Then we introduce the performance indexes used for the comparison. Some of these indexes, such as the flow rate irregularity, are commonly used for performance comparison, while others, such as the specific slipping and the rotor curvature, are particularly suitable in this case. The comparisons are made with the circular type that had been analyzed by the authors in previous papers (see eg, Mimmi, Pannacchi, and Savi (1996), Internal Lobe Pump Design, Mechanics in design - Proc CSME Forum ’96, SA Meguid (ed), Toronto, Ontario, Canada). It is not easy to univocally state the superiority of one type with respect to the others, however, it is possible to notice that elliptical and polycircular types are comparable to the circular ones in terms of flow rate irregularity, but have improved performance in terms of specific slipping and rotor curvature.

scholarly journals Decontamination performance of air filter paper impregnated with zirconium hydroxide on sulfur mustard

2021 ◽  
Vol 267 ◽  
pp. 02063
Author(s):  
Xingqi Huang ◽  
Ting Zhao ◽  
Chunxiao Yan ◽  
Yanren Jin ◽  
Yue Wu ◽  
...  
Keyword(s):  
Filter Paper ◽  
Degradation Rate ◽  
Sulfur Mustard ◽  
Filtration Efficiency ◽  
Zirconium Hydroxide ◽  
Order Reaction ◽  
Reaction Products ◽  
Air Filter ◽  
First Order ◽  
Before And After

Using zirconium hydroxide as a decontaminant, a kind of self-decontaminating air filter paper that can effectively degrade HD was successfully prepared by impregnating. The morphology and filtration efficiency of the filter paper before and after immersing were compared. The filtration efficiency increased linearly and slowly, with the regression equation: η=0.0001L+99.971. The liquid-solid decontamination reaction of HD on zirconium hydroxide powder and self-decontaminating filter paper conformed to the kinetic of quasi-first-order reaction and found that half-lives were 0.4 h and 2.1 h respectively. Good degradation performance for HD was exhibited and the degradation rate reached more than 99 % in 12 hours. Reaction products were analysed by GC-MS, which displayed that HD was decomposed through the substitution of chlorine and the elimination of H on α-C. The ultimate decontamination products were thiodiglycol and 2-hydroxyethyl vinyl sulfide without erosive toxicity.

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