Method for Determining the Velocity of Dust Particles in the Air Flow in the Ventilated Facade Design

The motion of polluting particles and dust particles in ventilated air cavities of the ventilated facade is considered. The equation, derived by the author, for calculating the speed of movement of dust and polluting particles into the air gap of ventilated faсade depending on the speed of air flow in the interlayer, dimensions of dust particles and their density, is given. It is established that at a Reynolds number ≤1 the velocity of dust particles coincides with the speed of the air flow; particles of dust and contaminants penetrate into the surface layer of the mineral wool insulation of basalt fibers as a result of which the sorption properties of the insulation near the surface, facing the air layer, and in the thickness of the thermal insulation layer differ from each other. However, the thermal conductivity of the heater remains below the design value.

N.P. UMNYAKOVA, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.) 

Scientific-Research Institute of Building Physics of the Russian Academy architecture and construction sciences (21, Lokomotivniy Driveway, Moscow,127238, Russian Federation)

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