The function of air filtration systems in motor vehicles is to improve air quality and cleanliness in car interior, control the respirable particle concentration in the operator's cabin, and reduce the dust concentration in the engine intake air to an acceptable level. In these applications, limited space is available for the air filtration systems. Therefore, filters are designed in smaller packages, resulting in higher aerosol velocities through the filters. Although car interior air filtration utilizes several advanced filter design technologies, these systems are still being improved because of the relatively low efficiency of current filter media caused mainly by high air velocity due to space limitation and very low permissible pressure drop. In contrast, high efficiency filters are required for operator cabins since these filters have to protect operators from high concentrations of small 0.01 - 10 micron particles such as silica, coal and others harmful contaminants. Typically, motor vehicle filters must meet the following general specifications: low flow restriction; high dust-holding capacity; highly efficient air cleaners (initial and total efficiency); small, compact components; long life; exclusive designs. The increased efficiency gained by using nanofiber media does not cause the usual consequent pressure drop penalty. Moreover, properly designed nanofiber filter media have lower reentrainment of already collected particles. In addition, because of the lower restriction, engine fuel consumption will decrease. This paper focuses on media performance requirements in motor vehicle air filtration applications, discusses the filtration process in nanofiber media, and provides filter performance characteristics for media and filters. High efficiency is achieved by increasing media solidity and lowering aerosol velocity. This approach also prevents reentrainment. Nanofiber offers high initial efficiency for small particles and fractional efficiency drastically increases when nanofibers are applied to a substrate. There is a direct correlation between filter performance and the amount of applied nanofiber. Nanotechnology helps to develop smaller, more compact components/long life filters that have higher efficiency, and low initial pressure drop. The 'positive' dust shedding - self-cleaning characteristic makes the nanofiber filters suitable for dusty environments where several cleanings are specified.


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    Title :

    Nanofiber media performance in application to motor vehicle air filtration


    Contributors:


    Publication date :

    2009


    Size :

    6 Seiten, 3 Bilder, 6 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





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