Benefit of the variable speed drive to an industrial fan
If the design values of a fan are rarely reached, it is interesting to use a variable speed drive to adapt the speed, as an alternative to the basic flow vein strangulation by a valve, a damper, a metal sheet or a diaphragm. Indeed, rather than to use all the pressure, even if not needed, through a strangulation device, it will be more profitable to regulate the speed to reach the operational flow-pressure point in order to save an important energy.
A calculation can be made in order to evaluate the depreciation period time for the cost of a variable speed drive.