Centrifugal Fan - How to Choose?
Release time:
2021-08-16
Centrifugal fans rely on input mechanical energy to increase gas pressure and discharge gas; they are a type of driven fluid machinery. Centrifugal fans are widely used for ventilation, dust removal, and cooling in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings; for ventilation and induced draft in boilers and industrial furnaces; and for exhaust and dilution of waste gas in chemical plants.
Flow and pressure
The main parameters for selecting a centrifugal fan are flow and pressure, with flow measured in m3/h, m3/min, or m3/s. In domestic practice, fans are typically measured in m3/h, while pressure is usually measured in pa or kpa. Higher pressure results in lower flow, which can also be seen from the fan curve. The same fan can meet many different flow and pressure requirements, but the power required at each point is not exactly the same. The larger the flow for a given fan, the lower the efficiency; the higher the pressure, the more likely the fan may stall, so it is important to select according to the recommended range on the curve.
Working temperature and altitude
Working temperature and altitude can affect the density of the gas, and altitude is also related to air pressure, which impacts the fan's pressure. Typically, the default is at normal temperature and on flat land; clear parameter requirements can ensure the correct selection of fan models.
Air composition
To determine which type of fan to use, you need to consider the composition of the gas. Is it clean air? Or is it dusty? Or does it contain moisture? The dust content in dust removal fans also determines the choice of impeller; if there are corrosive gases in the gas, the corrosion resistance of the fan's flow path must be considered, and the A4 connection method should not be chosen. Therefore, it is necessary to clearly understand the operating environment of the fan, including whether it contains dust and corrosive gases.
If you can place your face in the airflow and breathe freely, it indicates that the medium is clean enough, allowing for the selection of a high-efficiency blade-type centrifugal fan (a special type of backward-inclined fan) or an axial fan.
If the airflow contains dust, a backward-inclined fan should be selected. This type of fan requires more energy than blade-type fans but can operate for longer periods in corrosive environments.
If the dust in the air is severe or if some materials need to be processed, it is necessary to consider using a radial blade tip fan or a radial blade fan.
Exceptions: Customized blade-type fans can be used in environments with polluted air in the construction industry, such as in power plants or other typical installation sites. Radial blade fans may also be used in clean air because, from an aerodynamic perspective, they are more suitable for systems requiring low airflow and high pressure.
Dimensions
Fan project types are divided into new projects or renovation projects. For renovation projects, there will be specific requirements for the base dimensions, and space layout must be considered. Fan selection should be based on the layout structure of the site and the customer's dimensional requirements.
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