scholarly journals Air Filters: Cleanable Air Filter Transferring Moisture and Effectively Capturing PM2.5 (Small 11/2017)

Small ◽  
2017 ◽  
Vol 13 (11) ◽  
Author(s):  
Xinglei Zhao ◽  
Yuyao Li ◽  
Ting Hua ◽  
Pan Jiang ◽  
Xia Yin ◽  
...  
Keyword(s):  
Air Filters ◽  
Air Filter

scholarly journals Air filtration improvement of konjac glucomannan-based aerogel air filters through physical structure design

2021 ◽  
Author(s):  
Hong Qian ◽  
Ying Fang ◽  
Kao Wu ◽  
Hao Wang ◽  
Bin Li ◽  
...  
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Surface Area ◽  
Physical Structure ◽  
Structure Design ◽  
Air Filtration ◽  
Air Filters ◽  
Air Filter ◽  
Purification Time

Abstract This study presents two methods to improve the air filtration performance of konjac glucomannan (KGM)-based aerogel air filters through physical structure design by changing the pore-size distribution and the surface area, using an air purifier. Results indicated that KGM-based aerogels had a comparable filtration effect with the commercial air filter with a longer purification time. This purification time could be shortened by over 50%, by changing the pore-size distribution from large size to small size or increase the surface area with the fold structure. This should boost the development of polysaccharide-based aerogel used as the air filter.

scholarly journals Eco-Friendly Poly(Vinyl Alcohol) Nanofiber-Based Air Filter for Effectively Capturing Particulate Matter

2021 ◽  
Vol 11 (9) ◽  
pp. 3831
Author(s):  
Han-Jung Kim ◽  
Dong-In Choi ◽  
Sang-Keun Sung ◽  
Su-Han Lee ◽  
Sang-Jin Kim ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Quality Factor ◽  
Vinyl Alcohol ◽  
Nonwoven Fabric ◽  
Poly Vinyl Alcohol ◽  
Contamination Level ◽  
Plastic Pollution ◽  
Air Filters ◽  
Air Filter ◽  
Filter Surface

Due to the increasing use of polypropylene-based nonwoven dust masks and air filters, environmental problems that occur due to the plastic pollution resulting from the disposal of these materials have also increased. Hence, an eco-friendly air filter based on PVA nanofibers (NFs) was fabricated by electrospinning on a nonwoven fabric, and its performance was evaluated as a filter capable of blocking or capturing particulate matter. The quality factor of the optimized PVA NF-based air filter was found to be 0.010606 Pa−1, which is lower than that of a HEPA filter (0.015394 Pa−1), but higher than that of a cabin air filter (0.010517 Pa−1) and a dust mask (0.009102 Pa−1). The contamination level of the PVA NF-based filter was analyzed by optical and structural analyses of the filter surface. Finally, the filter was soaked in water to selectively remove the contaminated PVA NF layer, and the remaining nonwoven fabric was able to be reused to make the filter.

scholarly journals Dissemination of Cronobacter spp. (Enterobacter sakazakii) in a Powdered Milk Protein Manufacturing Facility

2008 ◽  
Vol 74 (19) ◽  
pp. 5913-5917 ◽  
Author(s):  
N. Mullane ◽  
B. Healy ◽  
J. Meade ◽  
P. Whyte ◽  
P. G. Wall ◽  
...  
Keyword(s):  
Milk Protein ◽  
Microbial Contamination ◽  
Protein Processing ◽  
Pulsed Field Gel Electrophoresis ◽  
Enterobacter Sakazakii ◽  
Powdered Milk ◽  
Air Filters ◽  
Air Filter ◽  
Manufacturing Facility ◽  
Processing Facility

ABSTRACT The microbial contamination of air filters and possible links to contaminated product in a powdered milk protein-processing facility were investigated. Over a 10-month period, seven air filters, the environment, and powdered product were analyzed for the presence of Cronobacter spp. The effects of air filter installation, maintenance, and subsequent dissemination of Cronobacter were investigated. A total of 30 isolates were characterized by pulsed-field gel electrophoresis (PFGE). PFGE revealed the presence of three clonal populations distributed throughout the manufacturing site. This study highlights the need for proper installation of air filters to limit the dissemination of microorganisms into processing sites.

scholarly journals Recent advances in antimicrobial air filter

2018 ◽  
Vol 67 ◽  
pp. 03016 ◽  
Author(s):  
A.A.I.A.S. Komaladewi ◽  
K. Khoiruddin ◽  
I.W. Surata ◽  
I.D.G.A. Subagia ◽  
I.G. Wenten
Keyword(s):  
Air Quality ◽  
Fine Particles ◽  
Antibacterial Properties ◽  
Antimicrobial Activities ◽  
Inorganic Nanoparticles ◽  
Secondary Source ◽  
Air Filters ◽  
Air Filter ◽  
Air Stream ◽  
And Performance

The worsening air quality has become an environmental issue since it has a serious effect on human health. This is generally attributed to airborne particles including various pathogens and others fine particles. Even though air filters show excellent removal efficiency towards pathogens, the captured microorganism can remain viable in the filter, grow, and re-suspended into an air stream resulting in a secondary source of pollutants. Considerable studies have been conducted to develop air filters which also have antibacterial properties for solving this issue. Results of several studies showed that air filters with antimicrobial activities have been successfully prepared by incorporating inorganic nanoparticles and natural plant extracts. With antibacterial properties, the air filters may be potentially used to control air quality, particularly for indoor spaces e.g. hospitals, by removing fine particles and inhibiting microorganism. In this paper, the recent development of antimicrobial air filter is reviewed. In addition, preparation and performance of developed antimicrobial filters are discussed. Prospects and challenges of antimicrobial air filter are also pointed out.

scholarly journals Antimicrobial Air Filter Coating with Plant Extracts Against Airborne Microbes

2020 ◽  
Vol 10 (24) ◽  
pp. 9120
Author(s):  
Ha Ram Byun ◽  
Seon Young Park ◽  
Ee Taek Hwang ◽  
Byoung In Sang ◽  
Jiho Min ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Plant Extracts ◽  
Photoelectron Spectroscopy ◽  
Micrococcus Luteus ◽  
Polymeric Coating ◽  
Tea Tree Oil ◽  
Air Filters ◽  
Air Filter ◽  
Tea Tree ◽  
Airborne Microbes

Antimicrobial air filters are required to protect humans from the risk of secondary bioaerosol pollution as well as airborne particles. Three plant extracts (tea-tree oil, rosemary, and garlic) were selected to replace antimicrobial chemicals in air filters. The antimicrobial activity of plant extracts was investigated using Micrococcus luteus and Escherichia coli. Phytochemicals present in the three plant extracts were identified using a gas chromatograph coupled with a mass spectrometer. The extracts were spray-coated on polyethylene terephthalate filter surfaces using silicate polymeric coating and evaluated via X-ray photoelectron spectroscopy and a scanning electron microscope with energy dispersive spectroscopy. After coating, an increase of 9.1% in the pressure drop was observed. The strain Micrococcus luteus was used to evaluate the antimicrobial activity of the air filter. After bioaerosol exposure, the tea-tree oil-coated filters immediately induced M. luteus cell inactivation (40–55%), whereas the rosemary and garlic coated filters did not. However, 48 h after exposure, a significant M. luteus inactivation of 99.99%, 99.0%, and 99.9% was recorded for concentrations of 2.89, 6.73, and 11.51 mg/cm2 for the tea-tree, rosemary, and garlic extracts, respectively. The coated filters exhibited high antimicrobial activity, thereby indicating significant potential for application as self-cleaning air filters.

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.

Experiments on Backward-Facing Step Flows Preceding a Filter

2007 ◽  
Author(s):  
S. Yao ◽  
C. Krishnamoorthy ◽  
F. W. Chambers
Keyword(s):  
Reynolds Number ◽  
Turbulent Flow ◽  
Separated Flow ◽  
Reynolds Numbers ◽  
Velocity Profiles ◽  
Step Height ◽  
Reattachment Point ◽  
Backward Facing Step ◽  
Air Filters ◽  
Air Filter

The resistance of automotive air filters alters upstream pressure gradients and thereby affects flow separation, the velocity distributions over the filter, and the performance of the filter. Air filters provide a resistance sufficient to alter flows, but not enough to make face velocities uniform. The backward-facing step flow is an archetype with a separation that resembles those found in automotive air filter housings. To gain insight to the problem of separation and filters, experiments were conducted measuring velocity fields for air flows in a 10:1 aspect ratio rectangular duct with a backward-facing step with and without the resistance of an air filter mounted downstream. The expansion ratio for the step was 1:2. The filter was mounted 4.25 and 6.75 step heights downstream of the step; locations both upstream and downstream of the nominal 6 step-height no-filter reattachment point. Experiments were performed at four Reynolds numbers between 2000 and 10,000. The Reynolds numbers were based on step height and inlet maximum velocity. The inlet velocity profiles at the step were developed. A Laser Doppler Anemometer (LDA) was used to measure velocity profiles and map separated regions between the step and the filter. The results indicate that the filter tends to decrease the streamwise velocity on the non-separated side of the channel and increase it on the separated, step, side compared to the no-filter flow. Non-separated flow tends to separate due to the deceleration and separated flow reattaches before the filter, whether the filter is placed at 4.25 or 6.75 step heights. The literature shows that without a filter the reattachment location depends on the Reynolds number in the laminar and transitional regimes, but is constant for turbulent flow. However, the area of the reversed flow may vary with Reynolds number for turbulent flow. With the filter at 4.25 step heights, the area of reversing flow is reduced significantly, and the Reynolds number has little effect on the main properties of the flow. With the filter at 6.75 step heights, the reversing flow area decreases as the Reynolds number increases though the reattachment point is fixed just upstream of the filter.

scholarly journals Perbandingan Penggunaan Filter Udara Standar dan Racing Terhadap Performa dan Emisi Gas Buang Mesin Sepeda Motor Empat Langkah

2018 ◽  
Vol 3 (2) ◽  
pp. 130-137
Author(s):  
Agus Fatkhuniam ◽  
M. Burhan Rubai Wijaya ◽  
Angga Septiyanto
Keyword(s):  
Experimental Research ◽  
Exhaust Emissions ◽  
Descriptive Statistics ◽  
Air Filters ◽  
Gas Emissions ◽  
Air Filter ◽  
Vehicle Performance ◽  
Co Gas

This research aims to determine the performance increase of using racing air filters compared to standard air filters on a four-stroke vehicle. Performance being tested are power, torque and exhaust emissions. This is an experimental research conducted on a Honda Supra X 125 PGM-FI motorcycle. Data were analyzed using descriptive statistics and the collection is presented in the form of tables, graphs, and calculated averages. Results show that racing air filter 1 have a power of 7.35 HP (2.3% increase) and racing air filter 2 have a power of 7,3 HP (1.6% increase). The torque tests shows that Racing filter 1 has a torque of 10,588 Nm and the racing air filter 2 has a torque of 10,585 Nm, while standard filter has only 10.42 Nm. CO gas emissions resulting from the use of racing air filters 1 increased by 28% from standard air filters and for racing air filter 2 CO 2 emissions decreased by 6%. At the exhaust emissions of HC, racing air filters 1 emissions increased by 16% and racing air filter 2 decreased by 9%. Penelitian ini bertujan untuk membuktikan adanya perbedaan filter udara racing dengan filter udara standar terhadap performa kendaraan empat langkah, berupa daya, torsi dan emisi gas buang. Penelitian dilakukan secara eksperimen pada sepeda motor Supra X 125 PGM-FI. Analisis data menggunakan statistik deskriptif dengan penyajian data berupa tabel, grafik. Hasil penelitian menunjukkan bhawa perhitungan rata-rata. sebesar 7,35 Hp dengan meningkat 2,3% dan filter udara racing 2 meningkat sebesar 1,6 % menjadi 7,3 HP dibandingkan dari hasil filter udara standar sebesar 7,18 Hp, torsi filter udara racing 1 meningkat sebesar 1,6% menjadi 10,588 N.m dan filter udara racing 2 meningkat 1,5% menjadi 10,585 N.m dibandingkan hasil dari penggunaan filter standar sebesar 10,42 N.m. Emisi gas buang CO yang dihasilkan dari penggunaan filter udara racing 1 meningkatan 28% dari filter udara standar 0,803% menjadi 1,034% dan CO filter udara racing 2  ada penurunan 6% menjadi 0,754% dari CO filter udara standar 0,803%, dengan selisih perbedaan 0,231% dan 0,049% dari penggunaan filter udara standar. Pada emisi gas buang HC filter udara racing 1 terdapat peningkatan sebesar 16% menjadi 142 ppm dari hasil filter standar dan penurunan 9% dari penggunaan filter udara racing 2 sebesar 111 ppm dibandingkan HC yang dihasilkan filter standar sebesar 122 ppm, dengan selisih 20 ppm dan 11 ppm dari HC yang dihasilkan filter udara standar.

scholarly journals The The Effect of Modified Air Filters to Improve Performance of Matic Motorcycles 110 cc

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Edi Widodo
Keyword(s):  
Combustion Chamber ◽  
Everyday Life ◽  
Major Effect ◽  
Improve Performance ◽  
Air Filters ◽  
Air Filter ◽  
Optimum Performance ◽  
Motorized Vehicles

At this time the fuel motor has a very important role in everyday life, especially in the field of transportation. The development of motorcycle technology is now on the matic system which has various shortcomings and adventages. This automatic motorbike also uses an air filter, air filter is one of the important components on a motorcycle that has a major effect on the performance of the engine that function as a filter for air impurities that will enter the combustion chamber. Because of the importance of the function of the air filter, it is necessary to do research with the aim of knowing the effect of the air filter on increasing the power and torque on a 110 cc automatic motorbike. Variant air filters are standar air filters, modified air filter, and testing without air filters. The test was carried out using a dynotest engine with different rpm from 2000 rpm – 4000 rpm, the test is carried out with the aim of knowing the increase in power and torque in each air filter being test. From the result of the study showed that the air filterless test produced an increase in power and the highest torque of 8.6 HP and 23.45 Nm of torque, when compared to standart air filters and modification filters. Altough the best improvement result are obtained from testing without air filters, the fuel motor must continue to use the air filter as a support to obtain optimum performance on motorized vehicles

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