Electrostatically assisted air coarse filtration for energy efficient ambient particles removal: Long-term performance in real environment and influencing factors

Tian, Enze; Gao, Yilun; Mo, Jinhan

doi:10.1016/j.buildenv.2019.106348

Cited by 24 publications

(16 citation statements)

References 49 publications

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“…The variation of filtration efficiency is caused by the fluctuation of air temperature, moisture, particle concentration, and accumulation. [ 19 ] It is shown in Figure S16 (Supporting Information) that the PDA‐140@PET filter is insensitive to moisture when the air moisture content is below 9.5 g kg −1 (equally 48% relative humidity at 25 °C, or 65% relative humidity at 20 °C). SEM images in Figure S17 (Supporting Information) show the morphology of the PDA‐140@PET filter after the long‐term testing.…”

Section: Resultsmentioning

confidence: 99%

“…[ 53 ] However, in the 30 d running, though the air resistance of the PDA‐140@PET filter increased from 9.5 to 17.4 Pa, it is still far lower than equally high‐efficiency commercial filters (>100 Pa at equal air filtration velocity). [ 32 ] Compared with a commercial pleated electret filter which served the same period (Table S3, Supporting Information), [ 19 ] the EAA PDA‐140@PET filter showed higher average filtration efficiency and lower air resistance. In all, the EAA PDA‐140@PET filter showed steady high filtration efficiency and an acceptable air resistance increase in a 30 day long‐term running period, thus gave a superior performance to ventilation filtrations.…”

Section: Resultsmentioning

confidence: 99%

“…To overcome the challenge, continuous electrostatic charging of the airborne PM and/or the filter material was proposed as a promising method. [ 19–29 ] Most of these trials are however based on medium‐high efficiency filters. These filters are either thin membranes to have limited dust‐holding capacity or have equivalently >50 Pa air resistance at 1 m s −1 filtration velocity.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ultralow Resistance Two‐Stage Electrostatically Assisted Air Filtration by Polydopamine Coated PET Coarse Filter

Tian

Gao

et al. 2021

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Airborne particulate matters (PM) pose serious health threats to the population, and efficient filtration is needed for indoor and vehicular environments. However, there is an intrinsic conflict between filtration efficiency, air resistance, and service life. In this study, a two‐stage electrostatically assisted air (EAA) filtration device is designed and the efficiency‐air resistance‐filter life envelope is significantly improved by a thin coating of polydopamine (PDA) on the polyethylene terephthalate (PET) coarse filter by in situ dopamine polymerization. The 8 mm thick EAA PDA‐140@PET filter has a high filtration efficiency of 99.48% for 0.3 µm particles, low air resistance of 9.5 Pa at a filtration velocity of 0.4 m s−1, and steady performance up to 30 d. Compared with the bare PET filter, the penetration rate for 0.3 µm particles is lowered by 20×. The coated PDA is of submicron thickness, 10−3 × the gap distance between filter fibers, so low air resistance could be maintained. The filter shows steadily high filtration efficiency and an acceptable increase of air resistance and holds nearly as many particles as its own weight in a 30 day long‐term test. The working mechanism of the EAA coarse filter is investigated, and the materials design criteria are proposed.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ultralow Resistance Two‐Stage Electrostatically Assisted Air Filtration by Polydopamine Coated PET Coarse Filter

Tian

Gao

et al. 2021

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“…However, this conclusion should not be regarded as a general difference between filter-based air cleaners and electrostatic air cleaners. Tian et al [41][42][43][44] developed electrostatically assisted mechanical filters. Tian et al [45] also presented a comprehensive quality factor (CQF) to evaluate the performance of electrostatic particle removal technologies.…”

Section: Electrostatic Precipitator Vs Mechanical Filtrationmentioning

confidence: 99%

Electrostatic Precipitators as an Indoor Air Cleaner—A Literature Review

et al. 2020

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Many people spend most of their time in an indoor environment. There is a positive relationship between indoor environmental quality and the health, wellbeing, and productivity of occupants in buildings. The indoor environment is affected by pollutants, such as gases and particles. Pollutants can be removed from the indoor environment in various ways. Air cleaning devices are commonly marketed as benefitting the removal of air pollutants and consequently, improving indoor air quality. Depending on the type of cleaning technology, air cleaners may generate undesired and toxic by-products. Different air filtration technologies such as electrostatic precipitators have been introduced to the market. The electrostatic precipitator (ESP) has been used in buildings because it can remove particles while only causes low pressure drops. Electrostatic precipitators can be either in-duct or standalone units. This review aims to give an overview of ESP use, methods for testing this product, the performance of existing ESPs in removing pollutants, their by-products, and the existing market for ESPs.

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“…Compared with medium-efficiency media filters widely used in existing air conditioning systems, electrostatic filters have similar filtration efficiency and lower resistance [14][15][16][17][18]. Another reason to consider using electrostatic filters in HVAC systems is that electrostatic filters can disinfect in addition to physically trapping pollutants.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Kong

et al. 2021

Buildings

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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.

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Electrostatically assisted air coarse filtration for energy efficient ambient particles removal: Long-term performance in real environment and influencing factors

Cited by 24 publications

References 49 publications

Ultralow Resistance Two‐Stage Electrostatically Assisted Air Filtration by Polydopamine Coated PET Coarse Filter

Ultralow Resistance Two‐Stage Electrostatically Assisted Air Filtration by Polydopamine Coated PET Coarse Filter

Electrostatic Precipitators as an Indoor Air Cleaner—A Literature Review

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

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