title: Submicrometer particle removal indoors by a novel electrostatic precipitator with high clean air delivery rate, low ozone emissions, and carbon fiber ionizer.
abstract: A novel positive-polarity electrostatic precipitator (ESP) was developed using an ionization stage (0.4 × 0.4 × 0.14 m(3) ) with 16 carbon fiber ionizers in each channel and a collection stage (0.4 × 0.4 × 0.21 m(3) ) with parallel metallic plates. The single-pass collection efficiency and clean air delivery rate (CADR) were measured by standard tests using KCl particles in 0.25-0.35 μm. Performance was determined using the Deutsch equation and established diffusion and field charging theories and also compared with the commercialized HEPA filter-type air cleaner. Experimental results showed that the single-pass collection efficiency of the ESP ranged from 50 to 95% and decreased with the flow rate (10-20 m(3) /min), but increased with the voltage applied to the ionizers (6 to 8 kV) and collection plates (-5 to -7 kV). The ESP with 18 m(3) /min achieved a CADR of 12.1 m(3) /min with a voltage of 8 kV applied to the ionization stage and with a voltage of -6 kV applied to the collection stage. The concentration of ozone in the test chamber (30.4 m(3) ), a maximum value of 5.4 ppb over 12 h of continuous operation, was much lower than the current indoor regulation (50 ppb).
authors: Environment and Energy Systems Research Division, Korea Institute of Machinery and Materials, Daejeon, Korea; Department of Electrical Engineering and Information Systems, School of Engineering, The University of Tokyo, Tokyo, Japan.
authors: H-J
authors: HJ
authors: Kim
authors: B
authors: B
authors: Han
authors: Y-J
authors: YJ
authors: Kim
authors: T
authors: T
authors: Oda
authors: H
authors: H
authors: Won
mesh_terms: D016902:Air Pollution, Indoor / Q000517:prevention & control*; D000465:Algorithms; D002244:Carbon; D000077482:Carbon Fiber; D010126:Ozone / Q000032:analysis; D052638:Particulate Matter; D055672:Static Electricity
chemical_list: D000077482:Carbon Fiber; D052638:Particulate Matter; D010126:Ozone; D002244:Carbon
keywords: Air cleaner; Carbon fiber ionizer; Clean air delivery rate; Electrostatic precipitation; Ozone; Submicron particles