Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8865295 | Journal of Aerosol Science | 2018 | 25 Pages |
Abstract
We developed and investigated the air cleaning performance of a novel electrostatic precipitator (ESP)-type small air purifier with a carbon brush ionizer and an activated carbon fiber (ACF) filter. This version had a high particle charging rate and a low ozone emission rate. Applying a negative voltage of 10 kV to the carbon brush ionizer increased the single-pass particle collection efficiency of 0.3-μm particles from 17.8% to 47.1%. The flow rate was maintained at 362 L/min, and the efficiency increased to 64.2% as we applied a negative voltage to the collection stage and increased the voltage to 10 kV. This was relatively low when compared to a market-leading commercial HEPA filter-type small air purifier (80.7%). However, our novel purifier showed a particle clean air delivery rate (CADR) of 0.31 m3/min, approximately a 1.7 times higher than that for the commercial purifier (0.18 m3/min) due to its high flow rate and low pressure drop. We measured the gas removal efficiency in a 1-m3 test chamber with acetic acid, acetaldehyde, and ammonia; after 30 min of operation, the results were 97.9%, 92.4%, and 87.8% for the novel purifier and 95.2%, 65.4%, and 57.9% for the commercial purifier, respectively. The ozone concentration was measured in a closed test chamber (30.4 m3) over 15 h of continuous operation, and it showed a maximum value of 2.5 ppb, much lower than the current standard for ESPs (50 ppb).
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Atmospheric Science
Authors
Myungjoon Kim, Gi-Taek Lim, Yong-Jin Kim, Bangwoo Han, Chang Gyu Woo, Hak-Joon Kim,