Efficient capturing of pollutants
An efficient capturing of pollutants is the basic prerequisite that these can then be separated from the air flow with high separation levels or high filter efficiencies, as required for example in current ventilation standards such as the new EN 16282.
Capturing pollutants in industry, as well as commercial kitchen ventilation, is often very complex. The reason for this is that the actual air flows of the pollutants are not known and these are far too often, much too simplistic adopted. Thus, for example, flow models of the German VDI 2052 standard are equated with the flow conditions encountered in reality when capturing pollutants. That It is assumed that a thermal air flow flows from bottom to top in a rectangular capturing device and arrived there, then all pollutants are to be sucked in near real time by the capturing device and delivered to the exhaust ductwork. Such assumptions and such flow models have nothing to do with the actual flow conditions and such assumptions are wrong!
Fan & Vacuum = Best Friends
The injection or acceleration of air flowing into the capturing device can considerably improve the capturing efficiency of such devices. In English this is explained (simplified and not quite serious 😉 ) as follows: Fan & Vacuum = Best Friends (see picture). This means the following: Each pollutant air flow flowing into a capturing device, entrains surrounded air with them, this anyway in the detection device flowing ambient air can now be accelerated by a fan and blown direct into the vacuum area were the filters and separators are installed, so that they arrived there can be sucked off faster. But such systems only really work when “Fan & Vacuum” become best friends! This means that the blowing and sucking must be very well matched, fluidic as well as the ratio of the injected and extracted air volumes. A short summary of these conditions can also be found in an explanatory video: https://youtu.be/APk5VOh4PYA?t=46s
This system is used, for example, in the new REVEN induction hoods, which meanwhile work without direct blown in outside air and only accelerate the ambient air flowing into the capturing device, like described above and thus increase the capturing efficiency heavily! We are happy to explain these flow topics to you as part of an in-house training course. If you are interested, you can contact us at firstname.lastname@example.org