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Centrifugal fan is a constant CFM device or a constant volume device, meaning that, at a constant fan speed, a centrifugal fan will pump a constant volume of air rather than a constant mass. This means that the air velocity in a system is fixed even though mass flow rate through the fan is not.
The centrifugal fan is one of the most widely used fans. Centrifugal fans are by far the most prevalent type of fan used in the HVAC industry today. They are usually cheaper than axial fans and simpler in construction.In automotive industries, fans are used for cooling internal combustion engines. The fan derives its energy from the power generated by the engine. It is used in transporting gas or materials and in ventilation system for buildings.They are also used commonly in central heating/cooling systems. They are also well-suited for industrial processes and air pollution control systems.
When one fan can’t afford the necessary flow and pressure, the fans must be run in series two or more, in order to achieve the goal. The pressure of the centrifugal fan is high, so it is widely used in the production and has high using frequency, the centrifugal fans in series are often applied in practical production. According to the relevant statistics, fan power consumption accounting for 12% of the total electricity consumption.
It has a fan wheel composed of a number of fan blades, or ribs, mounted around a hub. As shown in Figure 1, the hub turns on a driveshaft that passes through the fan housing. The gas enters from the side of the fan wheel, turns 90 degrees and accelerates due to centrifugal force as it flows over the fan blades and exits the fan housing.
The centrifugal fan was invented by Russian military engineer Alexander Sablukov in 1832, and found its usage both in the Russian light industry (such as sugar making) and abroad.
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