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Comparison of Discharging Electrodes for the Electrostatic Precipitator as an Air Filtration System in Air Handling Units

Category: Technical Note

Volume: 19 | Issue: 3 | Pages: 671-676
DOI: 10.4209/aaqr.2018.10.0367
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Dong Ho Shin, Chang Gyu Woo, Hak-Joon Kim, Yong-Jin Kim, Bangwoo Han

  • Department of Environmental Machinery, Korea Institute of Machinery and Materials, Daejon 34104, Korea

Highlights

Carbon fabric discharge electrodes showed the lowest onset voltage.
Collection efficiency was higher than tungsten wire, aluminum foil electrode.
Ozone generation of carbon fabric electrodes was 10 times lower than the others.


Abstract

The quality of indoor air is of increasing concern because it is closely related to human health. An air handling unit (AHU) can be used to control the quality of indoor air with respect to particulate matter and CO2, as well as providing air conditioning by regulating the temperature and the humidity. Electrostatic precipitators have high collection efficiencies and low pressure drops. However, their chargers can generate ozone, which is a drawback of applying them to indoor air control. In this study, we compared four discharging electrodes: a 50-µm tungsten wire, a 100-µm tungsten wire, 16-µm aluminum (Al) foil, and carbon fabric composed of 5–10-µm fibers. The carbon-fabric electrode exhibited superior particle collection efficiency and lower ozone generation for a given power consumption compared to the 50- and 100-µm tungsten wires, or the Al foil electrode. This low-ozone-generating, micro-sized electrode can be applied as an electrostatic precipitator in AHUs for indoor air control.

Keywords

Air handling unit Carbon fabric Discharge electrode Ozone


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