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METHODS OF AIR FILTRATION
According to the impurity retention mode, filtering elements function:
- by changing the air direction; the filtration is achieved by the passage of air through a multi-layered medium made up of submillimetric sieves. It is the simplest and oldest filtration method, which ensures a minimal gas-dynamic resistance
- by using disposable micronic cardboards, which ensure a filtration yield of 97% and a medium gas-dynamic resistance. It is the most efficient and commonly used filtration method in the car industry
- by using anti-static treated textile materials, which ensure a filtration yield under 90% and minimal gas-dynamic resistance. These materials are specially employed in the production of slim form filters
All the filters can be equipped with replaceable filtering elements, in order to avoid their overloading with dust particles, that would cause the gas-dynamic resistance to increase. This would generate insufficient absorption.Other traditional cleaning methods (by washing up or blowing out the impurities with compressed air) are inefficient, since once stuffed, the element can not be fully recovered to its initial functional state (to optimal gas-dynamic parameters). The cheapest, most efficient and wide-spread method involves the replacement of the stuffed element. The other methods are just commercial tricks.
AIR PARTICLES' COMPOSITION
Dust from air is very diverse, both by particle composition and dimensions. These features vary widely depending on climate and geographical location. Generally, the dust from air consists of SiO2, CaO2, MgO, Fe2O3, Al2O3, alkaline compounds, organic compounds, soot, lint and smoke. The sand particles are the most dangerous for the engine, being one of the strongest abrasive. Organic compounds are harmless to the engine. Dust density in air is between 0.0002 g/mł in the winter and 3 - 4 g/mł in the summer on unpaved roads, at 0.5 - 1 m height from the ground. On paved roads, in the summer, the air dust concentration is between 0.001 - 0.002 g/mł, 20 - 30 times higher than in the winter; the density ratio between the minimal and maximal values which can be attained (0.0002 and 4 g/mł, respectively) is 1 to 20 000. If during day time the sight range is limited to 25 - 30 m, it means that the dust concentration in the air is about 1g of dust/mł of air. According to size, dust particles fall into the following categories:
Dust from air is very diverse, both by particle composition and dimensions. These features vary widely depending on climate and geographical location. Generally, the dust from air consists of SiO2, CaO2, MgO, Fe2O3, Al2O3, alkaline compounds, organic compounds, soot, lint and smoke. The sand particles are the most dangerous for the engine, being one of the strongest abrasive. Organic compounds are harmless to the engine. Dust density in air is between 0.0002 g/mł in the winter and 3 - 4 g/mł in the summer on unpaved roads, at 0.5 - 1 m height from the ground. On paved roads, in the summer, the air dust concentration is between 0.001 - 0.002 g/mł, 20 - 30 times higher than in the winter; the density ratio between the minimal and maximal values which can be attained (0.0002 and 4 g/mł, respectively) is 1 to 20 000. If during day time the sight range is limited to 25 - 30 m, it means that the dust concentration in the air is about 1g of dust/mł of air. According to size, dust particles fall into the following categories:
- very small, under 0.001 mm, 70 - 75% of cases
- small, 0.001 - 0.005 mm, 15 - 17%
- medium-size, 0.005 - 0.010mm, 3 - 4%
- large, 0.010 - 0.050mm, 6 - 7%
- sand, above 0.050mm, 1 - 3%
Last Updated (Saturday, 19 March 2011 18:31)
