In order to improve the dust retention capacity of air filters and increase their lifetime, the filtration performance of associations of fibrous filters has been investigated. This study highlighted the interest of the addition of a medium or coarse filter, composed of microfibers, upstream of a HEPA filter. Collecting nanostructured particles in the depth of this upstream filter, rather than directly on the surface of a HEPA filter, permits to significantly reduce the pressure drop increase while maintaining a global mass collection efficiency close to the unit. On the one hand, the association of a medium filter and a HEPA filter induces a real energy gain, compared to the implementation of a single HEPA filter. On the other hand, the implementation of a coarse filter, presenting a too low initial collection efficiency, upstream of a HEPA filter leads to mixed results.

为了提高空气过滤器的除尘能力并延长其寿命，已经研究了纤维过滤器联合体的过滤性能。这项研究强调了在HEPA过滤器上游增加由微纤维组成的中型或粗型过滤器的兴趣。在此上游过滤器的深度而不是直接在HEPA过滤器的表面收集纳米结构的颗粒，可以显着减少压降的增加，同时保持接近装置的整体质量收集效率。一方面，与单个HEPA过滤器的实现相比，中型过滤器和HEPA过滤器的组合可产生实际的能量增益。另一方面，实施粗滤器会导致初始收集效率过低，