1. Air filter efficiency, filter efficiency factor affecting mainly the gas stream to be filtered particle diameter, fiber filter thickness, filter structure, air velocity, air temperature and humidity and dust content, summed up the efficiency of the filter It depends on the level of filter performance, the nature and filtered air velocity airflow. Air filter filtration efficiency on very small structures, mainly related to the performance of the filter; the filter change will affect the airflow velocity filter filtration efficiency differences of different types of filtration efficiency filter slightly in the same amount of wind, which is due to the different filtration area caused by different filtration rate 2. Air filter resistance, resistance analysis theory there are two kinds: one is the channel theory, assuming that the system can be modeled as a porous body constituted by a capillary, and the capillary flow through a circular with poise leaves (Poiseuille) law describes , Kozeny, Carman, Clarefiburg etc. on the use of this theory; the other is resistance theory, assuming a certain model geometry on behalf of the porous body as realistic as possible at the same time very simple, it is possible to calculate the velocity field, then know that the entire filter resistance, Kuwabara and other scholars adopted this theory L5. On the same type of filter, in the same nominal amount of wind, structural resistance equal to the total resistance is not the same size, mainly due to the resistance of different filter so that the total resistance of different; different structures at the air filter is not the same amount of wind resistance equal, indicating that the structure of the resistance and in addition to the inherent structure of the filter, the filter performance is also affected by the impact, and the performance will affect airflow through the filter status filter passage thus affecting the structure of the resistance related.
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