Effect of Pleating Ratio on Quality Factor of Pleated Filter in Air Purifier

초록

Electrostatic pleated filters are generally used in an air purifier. However, the pleating method has not been based on a theoretical approach but been dependent upon the manufacturer's know-how. In this study, an optimal pleating geometry was evaluated based on the filter quality factor considering collection efficiency and pressure drop of a filter. One flat filter and eight pleated filters (4, 6, 8, 10, 15, 21, 25, 30 pleats) with 29 mm in pleat height and 105 mm in filter width, were prepared, and their pressure drops and collection efficiencies were measured. Pressure drops of pleated filters with pleat number higher than 21 at the same gas flowrate increased with the number of pleats, which resulted from the increased filtration velocity due to decreased effective filtration area. However, collection efficiencies of a pleated filter for test particles (30, 50, 100, 200 nm) increased with increasing the number of pleats. Moreover, the highest filter quality factor for the pleated filter with 29 mm in pleat height was found at the pleats number of 21 (pleating ratio (=pleat height/pleat width), a=5.8), which resulted in the optimal pleat geometry.

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