High pressure fan is a type of fan design for providing flow with high pressure to use in purposes in industries. Generally there are two types of fan which are an axial fan and centrifugal fan. Centrifugal fan types are able to produce higher pressures, which make them suitable for harsh operating conditions, such as systems with high temperatures, moist or dirty air streams or material handling.
Centrifugal High Pressure Fans
There are many types of fan categories by blade shapes, however radial fans with flat blades can make the highest static pressure (up to 1400 mm WC) in high temperatures condition. If your work condition is the same, this type of fan is the best choice. Not only for the high static pressure but also this type of fan has other advantage—a simple design allows custom built units for special applications which can operate at low air flows without vibration problems known as high durability. It has another small advantage; it’s only suitable for low medium airflow rate. Forward curved fans with forward curved blades and backward inclined fan are two other types of centrifugal fan, but these types just operate for low and medium pressure.
Axial High Pressure Fans
Axial fans move an air stream along the axis of the fan. The way these fans work can be compared to a propeller on an airplane: the fan blades generate an aerodynamic lift that pressurizes the air. They are popular with industry because they are inexpensive, compact and light. There are some main types of axial flow fans.
Propeller fans generate low pressure, so we rarely use this type for high pressure purposes.
Tube- axial fan generate higher pressure and better operating efficiencies than propeller fans, so it suited for medium pressure and high airflow rate.
Vane-Axial fans are suited for medium to high pressure applications (up to 500 mm WC), Such as induced draft service for boiler exhaust. Moreover, this type can quickly accelerate to rated speed (because of their low rotating mass) and generated flow in reverse directions, which is useful in many ventilation applications. Most energy efficient (up to 85% if equipped with airfoil fans and small clearances) are expensive.
Conclusions
Generally, if you have to set up fan for a high pressure with harsh operating conditions that does not require much airflow rate; you should choose the centrifugal type (radial fans with flat blades). If your system requires high pressure but can quickly accelerate and is easy to adjust you should choose the van axial type.
Custom Fans of Australia will be happy to help you in your decision with choosing any type of fan or blower. All in all, Radial fans with flat blades and van axial type are a good choice for high pressure industrial systems.