Ozone Generation by Indoor, Electrostatic Air Cleaners

Boelter, Kimberly J.; Davidson, Jane H.

doi:10.1080/02786829708965505

Cited by 146 publications

(118 citation statements)

References 11 publications

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“…With decreasing wire diameter, corona onset voltage decreased and the I-V curve shifted to a higher current for a given voltage. These results agreed well with data presented by Boelter and Davidson (1997).…”

Section: Esp Performancesupporting

confidence: 83%

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Loading Characteristics of a Miniature Wire-Plate Electrostatic Precipitator

Huang

Chen

2003

Aerosol Science and Technology

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In this work, in order to investigate the particle loading effects on the performance of an electrostatic precipitator (ESP), simultaneous measurements of the dust cake thickness accumulated on the collection plates, ESP's collection efficiency, corona discharge characteristics, and ozone concentration were conducted experimentally. A laboratory scale single stage wire-plate ESP was used for the aerosol loading test. Two kinds of particulate matter, cement and aluminum oxide (Al 2 O 3 ), were generated by using a Palas Powder Disperser. A displacement meter was used to monitor the dust cake thickness accumulated on the collection plates. A scanning mobility particle sizer was used to measure the particle size distribution and number concentration upstream and downstream of the ESP. Ozone generated by the ESP was sampled 20 cm downstream of the ESP exit and measured with an ozone analyzer. The Dioctyl Phthalate (DOP) was also used as a liquid challenge agent in order to investigate the loading effects of liquid particles on the ESP performance.The results showed that when challenged with cement particles, the ion current decreased with increasing dust cake thickness under a constant electrical field strength. Moreover, the collection efficiency and ozone generated by corona discharge decreased as the loading test progressed. For example, when the dust layer was about 5 mm in thickness, the output current and the ozone concentration decreased about 33 and 44%, respectively, and the collection efficiency (300 nm particle) decreased about 4% at a fixed electrical field strength of −4.2 kV/cm. However, the ion current increased as aluminum oxide particles deposited on the collection plates. The increase in ozone concentration and aerosol penetration was mainly due to the occurrence of back corona, evidenced by the existence of the caves on the surface of the dust layers. In the case of testing with cement particles, the ion current rises after about 20 min of loading test and then decreases with time, while ozone concentration increases synchronously.

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Section: Esp Performancesupporting

confidence: 83%

“…For example, the ozone concentration decreased from 6,200 ppb to 2,500 ppb as wire diameter decreased from 0.8 mm to 0.3 mm at a flow rate of 50 L/min. This trend also agreed with a previous study (Boelter and Davidson 1997).…”

Section: Esp Performancesupporting

confidence: 82%

Loading Characteristics of a Miniature Wire-Plate Electrostatic Precipitator

Huang

Chen

2003

Aerosol Science and Technology

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“…The commercial air cleaner showed an ozone generation rate of 2.5 × 10 -3 mg s -1 , even though this generation was affected by the relative humidity, kind and dimension of the electrode material, and current (Boelter and Davidson, 1997). To reduce ozone generation, a positive corona discharge was used in this experiment.…”

Section: Ozone Concentrationmentioning

confidence: 99%

Capture of Ultrafine Particles Using a Film-Type Electret Filter with a Unipolar Charger

Sambudi

Choi

Lee

et al. 2017

Aerosol Air Qual. Res.

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Electret filters have been used widely to collect particles because of their low pressure drop and high collection efficiency due to the electrostatic attraction between the particles and filter. However, the collection efficiency of these filters decreases over time due to charge degradation. Therefore, a unipolar charger using a corona discharge was combined with an electret filter to overcome this decrease. The highest particle collection efficiency for 70 nm, uncharged particles occurred with a fresh electret filter was 34.0%, whereas a neutralized filter had a collection efficiency of 32.6%. However, when fresh and neutralized electret filters were used with a unipolar charger (electret field: 1.9 kV cm -1 ), the highest particle collection efficiencies of 99.8% and 98.2%, respectively, were obtained and appeared at the electrode-tomesh distance, a distance similar to the duct diameter. The distance between the tip of the discharge electrode and filter, which can be predicted using Sigmond's law, affected the charge density value on the filter surface. The ozone concentration was negligible under optimum conditions for particle collection. Therefore, using an electret filter combined with a corona discharge has good potential for improving air purifiers.

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“…The dangerous effects for the ozone gas on health of humans are well recognized. [17][18][19] This makes the ozone generation inside any device operates by using the corona discharges represents a great problem on the health of the users, especially inside the closed places. Therefore, the devices that are used in the real applications, where the air is inhaled by humans, animals and plants, and touches other materials, should be designed with adequate efficiency, but not so high to produce dangerous levels of the ozone concentration.…”

Section: Introductionmentioning

confidence: 99%

Positive direct current corona discharges in single wire-duct electrostatic precipitators

2016

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This paper is aimed to study the characteristics of the positive dc corona discharges in single wire-duct electrostatic precipitators. Therefore, the corona discharges were formed inside dry air fed single wire-duct reactor under positive dc voltage at the normal atmospheric conditions. The corona current-voltage characteristics curves have been measured in parallel with the ozone concentration generated inside the reactor under different discharge conditions. The corona current-voltage characteristics curves have agreed with a semi empirical equation derived from the previous studies. The experimental results of the ozone concentration generated inside the reactor were formulated in the form of an empirical equation included the different parameters that were studied experimentally. The obtained equations are valid to expect both the current-voltage characteristics curves and the corresponding ozone concentration that generates with the positive dc corona discharges inside single wire-duct electrostatic precipitators under any operating conditions in the same range of the present study.

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Ozone Generation by Indoor, Electrostatic Air Cleaners

Cited by 146 publications

References 11 publications

Loading Characteristics of a Miniature Wire-Plate Electrostatic Precipitator

Loading Characteristics of a Miniature Wire-Plate Electrostatic Precipitator

Capture of Ultrafine Particles Using a Film-Type Electret Filter with a Unipolar Charger

Positive direct current corona discharges in single wire-duct electrostatic precipitators

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