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

• DOI: 10.4209/aaqr.2016.03.0104
• Publication Date: 2016-05-19T15:30:23Z
• Authors: Nonni Soraya Sambudi; Hyun-Jin Choi; Myong-Hwa Lee; Kuk Cho
• Keywords: Electret; Electrostatic precipitator

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