I said in the previous article that although the fans are essentially simple equipment and principle quite usual, regardless of the size or function of their specific, even in industry there is a tendency to underestimate the importance, enjoying our attention only when their performance is lacking, affecting, sometimes severely, the operation of other equipment. Therefore the calculation of the required air flow and ventilation choosing an industrial fan can be a real challenge, and the wrong choice can lead to its inefficiency. Therefore several principles of operation of fans believe it is useful to be mentioned below.
All fans, especially fans industrial builds, the principle of operation, the production and movement of currents flowing liquid or gas, depending on the environment. In general work environment is the air used either as industrial fans used for cooling of equipment or workspaces, whether they have to evacuate pollutants, dust, fumes or pneumatic conveying bulk materials.
The assembly’s main rotor any fan is a profiled wheel which has the effect that by its movement, its kinetic energy to transmit air, setting in motion currents of fluid to be transferred. The principle of movement and action of the rotor is the flywheel. This is a mechanism whose main part is a wheel rotating rotor in our case, the drive stores the kinetic energy. Shaped wheel ensures a high moment of inertia, which opposes changes in rotation, based on the physical property of conservation of angular momentum. I mean a body that rotates around its axis tends to keep the axis of rotation and will oppose a disruptive impulse to another, along an axis perpendicular to the rotation axis and the axis pulse disruptive.
Flywheel’s energy is transmitted by applying a torque, which makes the speed to increase progressively storing energy. The energy stored in the flywheel is proportional to the square of the speed of rotation ω2.In further flywheel or rotor, and releases this energy practically applying it a couple working environment, the fluid (air) floated by industrial fan which is driven at a speed so proportional to the square of the speed of rotation, as we saw above. Efficient industrial fan is just on a power calculation, which was reflected especially evident efficiency and ventilation equipment that transmitted the mass of fluid that train.
In this way, the fluid, air or polluted air contaminant, air transport for use as a pneumatic or air cooling benefits of supply with greater power than the power source continues. In other words the energy released by the rotor is multiplied against the power supplied by the engine. A flywheel can store energy to release gradually and suddenly, with great power. And the ratio multiplier depends primarily on the size of the rotor, the flywheel.
At the same time providing guidance of the industrial fan fluid (air) to the mechanical system is considered. The angular momentum of the flywheel is transmitted as torque to the mechanical system. The flywheel is the one that supplies power to its orientation to the desired position, respectively guiding the flow is fluid in the direction and force required for the purpose fan operation (transport heavy particles or less heavy quench maintaining a specified temperature when in space so there is a quasi-constant heat input from another source or to achieve a thermal threshold in a determined time, absorbing gases, vapors or bulk materials, etc.)
Thank you and wait to meeting you in the next pages. Or, even better, in our factory …
Lucian GOJ, Research & Development Director,
+40.729.766 000, firstname.lastname@example.org
COMPANIA DE VENTILATOARE-SA
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