Research on Filter Boxes Designs Efficiency
Background. Filtering respirators are widely used in various industries to protect workers from dust, so studies aimed at improving ergonomic parameters of personal respiratory protection are relevant.
Objective. The aim of the paper is the filter box design influence on respirator breathing resistance.
Methods. The distribution of the air flow rate and the pressure drop across the filter was determined in accordance with the requirements of the DSTU EN 143: 2002. To do this, in the back wall of the filter box housing 5 mm holes were drilled, in which every 10 mm a Pitot tube was installed, connected to an electronic manometer Testo 512.
Results. It is established that the designs of filter boxes affect the pressure drop of the respirator, due to the failure to use a significant surface of the filters (the formation of dead zones in which air does not move) what affects the efficiency of their performance.
Conclusions. The designs of filter boxes for modern respirators require appropriate modification to reduce the resistance to breathing, to increase the duration of protection and dust load, due to uniform flow around the filter surface by air flow throughout the area.
Full Text:PDF (Українська)
J. Wang et al., “Modeling of filtration efficiency of nanoparticles in standard filter media”, J. Nanopart. Res., vol. 9, pp. 109–115, 2007. doi: 10.1007/s11051-006-9155-9
A.W. Richardson et al., “Respirator filter efficiency testing against particulate and biological aerosols under moderate to high flow rates”, U.S. Army Edgewood Chemical Biological Center Report for Contract No. SP0700-00-D-3180, Task No. 335, ECBC-CR-085, 2006.
Yu-Mei Kuo et al., “Evaluation of exhalation”, Ann. Occup. Hyg., vol. 49, no. 7, pp. 563–568, 2005. doi: 10.1093/ann hyg/mei003
Che-Ming Yang et al., “Dynamic respirator exhalation valve test apparatus”, in Proc. Conf. Occupational Hygiene, April, 5–7, 2011, Holiday Inn, Stratford-upon-Avon, UK, pp. 19–20.
I. Horvath et al., “Exhaled breath condensate: methodological recommendations and unresolved questions”, Eur. Respir. J., vol. 26, pp. 523–548, 2005. doi: 10.1183/09031936.05.00029705
L. Boskovic et al., “Filtration of nanosized particles with different shape on oil coated fibres”, J. Aerosol Sci., vol. 38, pp. 1220–1229, 2007. doi: 10.1016/j.jaerosci.2007.09.003
C.S. Kim et al., “Filtration efficiency of a fibrous filter for nanoparticles”, J. Nanopart. Res., vol. 8, pp. 215–221, 2006. doi: 10.1007/s11051-005-9017-x
L.L. Janssen et al., “Efficiency of degraded electret filters: Part I – Laboratory testing against NaCl and DOP before and after exposure to workplace aerosols”, J. Int. Soc. Resp. Prot., vol. 20, pp. 71–80, 2003.
V.I. Golinko et al., “Protection means of respiratory organs of mining enterprise workers”, Metallurgicheskaja i Gornorudnaja Promyshlennost', no. 4, pp. 111–116, 2016 (in Russian).
GOST Style Citations
- There are currently no refbacks.
Copyright (c) 2017 NTUU KPI