Analysis of Pressure Losses of Selected Filtration Materials
Abstract
With the increasing demands on the efficiency of filtration materials, it is essential to pay attention to the study of pressure losses that occur during the flow of air through these materials. This article presents a device design for measuring pressure losses, followed by experimental verification of selected filtration materials. From the individual measurements, permeability and resistance coefficient are evaluated, which are key for determining the filter's pressure parameters and its performance under real operating conditions.
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Introduction
The capture of aerosol particles using solid filters is the most widespread method of air purification, proven to be a simple, universal, and cost-effective way to separate particles. At low dust concentrations, fibrous filters are the most economical solution for effectively removing even very small microscopic particles. This technology is used in various areas, such as respiratory protection, air conditioning, air purification in industrial operations, and more. Although the basic principles of filtration are well studied, it remains a complex process in which discrepancies often arise between theoretical models and experimentally measured results [1].
Pressure loss is one of the main parameters determining the usability of different types of filters, as it affects their energy consumption, the efficiency of medium flow, and the overall requirements for their application in various areas of use.
Conclusion
The results obtained from measurements on the designed device show that respirators achieved the lowest permeability and the highest resistance coefficient, as they are intended for use in environments with high concentrations of aerosol particles, bacteria, and viruses, where it is necessary to ensure the maximum level of filtration and respiratory protection for the user. To meet these conditions, materials with a very fine microstructure are required, which effectively capture even the smallest particles but at the same time increase the airflow resistance during breathing.
In contrast, masks exhibited higher permeability and lower resistance coefficients, indicating their lower ability to filter fine particles. This phenomenon is caused by their simpler fabric structure, which generally has larger pores and fewer layers compared to respirators. As a result, masks offer less resistance to the flowing air, which increases breathing comfort but simultaneously reduces their effectiveness in capturing aerosols and microorganisms. These properties make masks more suitable for use in ordinary, less risky environments where a high level of protection is not required.
The designed and constructed device is intended for testing various filtration materials, with its versatility lying in the possibility of adjusting components used to mount the filtration material—manufactured by 3D printing—as well as the fan that creates the required pressure in the system. Based on the measurement results obtained, it is subsequently possible to design the necessary filtration area that would meet the relevant standards or device requirements where the filtration materials will be applied. The simplicity and versatility of this device make it useful in various application areas as a preliminary step for verifying filter efficiency