Investigation of the Dynamics of Solid Particles Moition Into the Ventilated Air Gap of the Cladding Fa?ade Systems

[摘要] All articles must coTheatmospheric air in cities contains a large number of pollutants in the form of solid particlesand dust. One of the most dangerous not only for humans, but also for building structures, are the particles smaller than 10 microns. They penetrate into the structures of cladding facade systems, fall and settle on the surface ofa insulation made of mineral wool, as well as on metal elements of the facade cladding system, facedinto the ventilated air layer. The author carried out a large number of experimental studies of structures of facade cladding systems, which made it possible to choose the following parameters and characteristics when performing this work.The article deals with the dynamics of the motion of dust particles with a size from 1 to 5 microns in the air interlayer of the claddingfaade system with the Reynolds number Re ≤ 1. An equation is obtained for calculating the velocity of dust particles in a size of 10-50 μm in the air stream at its rate of 0.1-0.0, 8 m/s at various outside air temperatures, as well as the conditions under which dust particles "levitate" in the air gap are determined. At the same time, "levitating" dust particles settle on the surface of a mineral wool insulation from a stone fibber and penetrate into the thickness of the fibrous insulation, causing a change in its thermal and sorption characteristics.

[发布机构] Research Institute of Building Physics (NIISF), 21, Lokomotivnij pr., Moscow; 127238, Russia^1

[关键词] Air interlayers;Building structure;Facade cladding;Fibrous insulation;Metal elements;Outside-air temperature;Solid particles;Sorption characteristics