Electrostatic enhanced air filters with improved energy efficiency

The research article 'A newly developed electrostatic enhanced pleated air filters towards the improvement of energy and filtration efficiency' has been published in Elsevier journal Sustainable Cities and Society (Volume 49, August 2019).

Abstract

The widely utilized high efficient particulate air filters (HEPA) lead to high building energy consumption. Indoor particle removal technology with minimal pressure drop is urgently needed for both air purification and energy conservation. Electrostatic enhanced air filter (EEAF) has potential to achieve high filtration efficiency and low energy consumption simultaneously. It uses external electric field to improve fabric filter performance without adding pressure drop. However, available researches utilized EEAF with flat filter in laboratory-scale study, which restricted engineering applications due to limited filtration area and high pressure drop. In order to improve EEAF, the present study developed electrostatic enhanced pleated air filters (EEPF). Experiments and mathematical model established in our previous study were adopted to investigate filtration performance of EEPF for fine particles (0.01–10 μm).

Compared to EEAF with flat filter, EEPF saved 75% energy consumption and improved filtration efficiency up to 20%. Results show that filtration efficiency of EEPF was sensitive to duct velocity, applied voltage and filter type. Ozone mass generated by EEPF satisfied ASHRAE standards. The validated mathematical model was adopted to optimize pleat geometries of EEPF. Compared with HEPA, optimal EEPF had comparable filtration efficiency (>98%) and saved 70% energy consumption.

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