An experimental study of electrostatically augmented air (EAA) lters coupled with a corona precharger has been conducted using Arizona road dusts and tobacco smoke. The measurements of lter ef ciency and pressure drop across the EAA lter have been made using an ASHRAE 52.1-1992 lter test system and an opacity meter to measure the particle concentration upstream and downstream of the test lter. The two-stage EAA lter unit consists of the positive corona precharger upstream of a lter, to precharge particles with the electrical strength of 4.7 kV/cm, and an electri ed lter collector, which has folded media with meshy metal separators, in the upstream and downstream side gaps. DC voltage of + 1,000 V (1.4 kV/cm) is applied between the upstream and downstream separators to produce an electric eld between the separators and media as well as across the media in a polarity so that most of the precharged particulates are collected on the upstream lter collector. A conventional lter was measured and had 70.0% ef ciency with dusts of 1.96 ¹m in mass median diameter and 2.5 m/s face velocity, while the EAA lter had 92.9% ef ciency. An electrical effect on the EAA lter was evaluated to both improve the lter ef ciency and reduce the pressure drop across the lter. Also, the performance evaluation of the EAA lter using an air handling chamber system in occupied space was investigated with tobacco smoke particles.
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