As we have seen, the predominant relationship for the calculation of any industrial fan is the one between pressure and flow. Always when the flow rate increases according to the relation Q m = p.Qv (where Qm is the massic flow and Qv is the volumic flow), the pressure Δp defined as total pressure and determined that the relationship Δpt = pt2-pt1 where: pt2 = ps2 + p, (i.e. the difference between total average discharge pressure Pt2 and total pressure pt1 average intake) decreases. Depending on these, they draw for each industrial fan, through measurements, the working diagram.
Also on the same chart, taking into account the to the same parameters, it is calculated and represented the absorbed power Nef and which, as natural, increases as the flow rate increases in use too. Consequently, the question which always arises for calculating energy efficiency is actually the drawing of the rising slope of Nef. The more flatter it is, angled slightly lower growth as horizontal, it means that the energy consumption is lower and the difference ceased to the environment is therefore significantly reduced. Hence the effective yield for use of the industrial fan will be greater, namely its effectiveness.
With increasing pneumatic energy also increase the kinetic energy as well as the pressure energy. The specific fan energy is given therefore by the reducing of the volume of fluid due to performing mechanical work from suction area to the discharge area. The rotor is practically the subassembly which performs the specific energy of the fan.
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