The performance of an air purifier is determined by its clean air delivery rate (CADR), expressed as the product of the air flowrate and filter collection efficiency. A high CADR in a commercial air purifier is achieved using a pleated air filter with high filtration performance at a given air flowrate. However, obtaining this high filtration performance depends on the knowledge of the manufacturer, including the optimal pleating design, which remains uncertain to date. In this study, test pleated filters were prepared by folding a flat electrostatically-charged E12 filter medium to obtain different pleating geometries. The proper pleat geometry of the pleated filter, which has a minimum pressure drop at a fixed air flowrate, was dependent on the pleat length (P_L) and pleating ratio (α = pleat height/pleat width), wherein as the P_L increases, the α range required to achieve a minimum pressure drop similarly increases. Based on the filter quality factor (q_F), the optimal pleat geometry of a pleated filter was between α values of 6–8, irrespective of the P_L. Although both P_L and α have certain influences on the q_F, α has a greater influence on the pleated filter with no dead zone.

中文翻译：

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用于空气净化的褶皱过滤器中特定褶皱高度的优化褶皱几何形状

空气净化器的性能取决于其洁净空气输送率 (CADR)，表示为空气流量和过滤器收集效率的乘积。商用空气净化器的高​​ CADR 是通过使用在给定空气流量下具有高过滤性能的折叠式空气过滤器实现的。然而，获得这种高过滤性能取决于制造商的知识，包括最佳的褶皱设计，目前仍不确定。在这项研究中，通过折叠带静电的平面 E12 过滤介质以获得不同的褶皱几何形状来制备测试褶皱过滤器。在固定空气流量下具有最小压降的褶式过滤器的适当褶皱几何形状取决于褶皱长度 (P _L) 和褶皱比 (α = 褶皱高度/褶皱宽度), 其中随着 P _L的增加, 实现最小压降所需的 α ​​范围类似地增加。基于过滤器品质因数 (q _F )，褶式过滤器的最佳褶皱几何形状介于 6-8 的 α 值之间，与 P _{L 无关}。虽然P _L和α对q _F都有一定的影响，但α对褶式无死区过滤器的影响更大。