Enhancement of the performance of low-efficiency HVAC filters due to continuous unipolar ion emission.

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Title Enhancement of the performance of low-efficiency HVAC filters due to continuous unipolar ion emission.
Author Agranovski, Igor E; Huang, Shih Hui Ruth; Pyankov, Oleg; Altman, Igor; Grinshpun, Sergey A.
Journal Name Aerosol Science and Technology
Editor Prof Flagan
Year Published 2006
Place of publication Philadelphia, PA USA
Publisher Taylor & Francis
Abstract Our novel concept utilizing continuous emission of unipolar ions, which has been recently proven to enhance the efficiency of facepiece respirators, was applied to conventional HVAC filters. Laboratory study demonstrated that the air ion emission in the vicinity of a low-efficiency HVAC filter significantly improves its performance. For example, the collection efficiency of two commercial HVAC filters challenged with 1μm PSL particles jumped from 5-15% (measured with no ion emission) to 40-90% (when the ion output rate was ∼ 1012 e-/sec). The enhancement effect depends on the filter type and, generally, on the distance from the ion emitter to the filter surface. The results were explained as follows. The air ions with high mobility are deposited on the fibers forming a macroscopic electric field, which shield out some incoming unipolarly charged particles due to repelling forces. The field estimate has shown that this explanation is feasible. The enhancement effect seems to have a good potential to be employed in industrial and residential ventilation systems as it enhances the aerosol collection efficiency of a low-efficiency HVAC filter while not affecting its pressure drop.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1080/02786820600833203
Volume 40
Page from 963
Page to 968
ISSN 0278-6826
Date Accessioned 2007-03-16
Date Available 2015-02-03T03:02:46Z
Language en_US
Faculty Faculty of Science, Environment, Engineering and Technology
Subject PRE2009-Environmental Technologies
URI http://hdl.handle.net/10072/14368
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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