Mobile ventilation systems

All local ventilation systems can, in principle (and many are in practice), be manufactured for use in one or more of three different modes fixed, flexible, and mobile. 

Mobile exhaust or supply systems also include portable systems—for example, the systems consisting of a fan and a flexible tube used in construction work, either for exhausting or supplying air in work areas without any ventilation system. The work area must have some type of connection, such as windows, to the surroundings. 

Mobile local exhaust ventilation system used for the removal of rock dust during mechanical preparation. 

These selection and evaluation criteria were applied systematically to four technological fields, three of which contribute to new energy-efficient solutions. Passive houses, for example, with their major components of insulation solutions, window systems, ventilation and control techniques are close to market diffusion within the next ten years. Fuel cells for mobile uses in vehicles, however, are still a long way from market introduction, for instance, because of unresolved problems regarding the deactivation of the membrane electrode assembly (MEA) and the need for cost reductions by about one order of magnitude. Other types of fuel cells for stationary uses may be closer to market introduction, owing to less severe technical bottlenecks and better economic competitiveness. 

It can be concluded that the modeling of spraying systems as a kind of the penetrable roughness, or canopy, successfully leads to important practical results. It should also be stressed that many questions still remain unsolved by the one-dimensional half-analytical performance method. Short spraying coolers or large-scale SCSs constructed with relatively short sections with ventilation corridors between them require a more attention to the SCS initial region. Winter weather conditions, as well as the behaviour of tall fountains, require the simultaneous consideration of heat and mass exchange. The SCS impact on the environment focuses attention to the dispersion of droplet sizes. It was proved over that the initial simple models of immobile or mobile EPR elements have been sufficiently pliable to include new physical phenomena. 

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