ACADEMY
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TECHNICAL ARTICLES
Below, it is possible to read and discover several technical articles which are really useful to understand all questions in relation with right operation of a fan in any kind of process. We remain, indeed, at your disposal for further information or inviting you to register to our training ‘AirVision Academy” to widen your knowledge.
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1. Practical guide of the industrial fan
Once an air motion is established, a pressure drop is generated… The guide is available in the Dutch or French Practial guide : Dutch Practial guide : French
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2. Normalized orientations of fans
To define the orientation of the fan one must always be placed on the drive side looking towards the fan.
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3. Arrangements of centrifugal fans
The impeller directly mounted on the motor shaft. The motor placed on the motor chair…
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4. Calculation of air density
The curves of the fans are in general shown for a density equal to 1.2kg/m³, this value is given for the air at 20°c and at zero meters above sea level.
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5. Surging
As a child, all of us, we once discovered the surging phenomenon! The pressure, generated by our lungs blowing into a balloon, shows sometimes the difficulties to overcome the…
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6. Fans in series
It happens that some industrial process avid of pressure; require to place two fan in series. This arrangement might be used when the pressure is higher and that the material used forbid to use a single stage fan….
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7. Fans in parallel
When a process requests to operate several working points, it is used to design the system on 2 fans with parallel arrangement.
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8. Use of rubber isolators
We often believe doing right by equipping the fan with « vibration dampers ». This term is misleading, as it is not avoiding the fan to vibrate but is giving a more freedom to vibrate flexibly…
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9. Torque stories
The variable speed drives are increasingly used for fan operations. The advantages of a VSD are numerous…
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10. Starting & braking of centrifugal fans
The centrifugal fan’s impeller may have sometimes an important inertia, if we relate it to the power motor in charge to drive it.
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11. Vibration status of the fans and balancing
The fan is the origin and siege of vibrations, because of the rotating part (impeller). For example, based on the formula F = m.w².r, an unbalance of 20 gr located at the periphery of an impeller with diameter =900mm and at 3000 RPM speed, will be generating an alternative centrifugal force of 900N.
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12. Pressure loss due to a stationary fan
Often we are requested to know what will be the pressure loss caused by a fan stopping to operate, after an electrical or mechanical breakdown, in order to size sufficiently another fan far further on the same circuit, which will compensate momently the loss of pressure, without to affect the stable flow.
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13. Critical speed of the shaft : essential setting in the fan design
The mechanical design of the fan is indeed a cost matter first leading to a complete fan design with minimum thickness, cheaper material and lower work hours possible, in order to reach a competitive price.
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14. Terms of use of motors with frequency inverter
The use of a frequency inverter with asynchronous low-voltage 230/400/690V motors requires an adapted setting of the inverter.
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15. Static and Dynamic loads of the Fans
The static load of the fan consists in its own weight in N (Newton). However the fan is a rotating machine not perfectly balanced, even when it is new. Furthermore, during the rotation, the fan may be used with gases including corrosive, clogging or abrasive dust which are able to deteriorate the balancing of the fan […]
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16. Fans for thermic applications
The thermic applications involving fans are existing in numerous industries and the original equipment manufacturer incorporating fans are mainly boilers manufacturer, heater and oven manufacturers but also the dust extraction manufacturer… Each has special specifications but all require reliable machines with high efficiency because operating 24/7 during several years.
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17. Electrical triphase motor wiring diagrams
This document contains the schema for the electrical wiring of a triphase motor equipped on a fan.
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18. Energy saving in the use of centrifugal fans
One of the hot topics in the media is often the energy saving, becoming one of the most important matters for the mankind and our planet. While several industrial major players are trying to decrease the CO2 emissions by several tools (heat recovery boilers, energy production from biomass, cogeneration…) the machines manufacturers (fans, pumps, motors…) […]
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19. Mechanical check-list for new fan start-up
Concerning the rotating machines, we have also to ensure a right mechanical Start-up in order to keep safe the persons, as well as for the life-time machine components, whatever its size or motorization. Especially in case of process machines with an important peripheral velocity, or when dedicated to work in severe operating conditions…
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20. Aeraulic check list at new fan start-up
During new fan installation and after mechanical check (please see our maintenance and user manual), it is necessary to ensure few “Aeraulic” precautions” at commissioning…
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21. The flow units
According the routing sheet, the flow to be realized by the fan is given in volume flow (m³/h) or in mass flow (kg/h)…
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22. Conversion factor : pressure
The use of different pressure units might be confusing. This is why we suggest you a chart with the existing conversion factors.
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23. Electrical currents destroying the bearings
When doing welding operation on existing fan, it is essential to place a grounding clip the nearest possible to the welding zone…
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24. Noise, it is the empty barrels that are the noisiest
The noise of the fans (magnificent sound boxes) is due to several causes. Aeraulic reasons are often more impacting than mechanical ones.
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25. Air renewal
In order to ensure sufficient ventilation in a room, production hall…
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26. Determination of the Aeraulic characteristics of a fan family
When a fan manufacturer answer to a price request for which the requested flow and pressure are important, or when the fans has to be designed according a technical specification file…
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27. Working point regulation by inlet vane control.
The Inlet Vane Control is a regulation device to set up a desired working point of the fan. It is installed straight ahead on the suction flange….
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28. Working point regulation by variable speed drive.
The fans should often operate at partial flow. For example, on centralized dust extraction, it is useless to have a suction on the workstations which are not used…
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29. Fan’s bearing lubrication
Statistics performed by manufacturers are showing that early malfunctions are essentially due to the following reasons:
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30.Fan use and Engery Savings
Energy is also a main concern in the industry. Here under we define some solutions in order not to waste energy.
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