4. The rotating component is usually called ‘swirl’. The axial load of an object is responsible for the force which passes through the center of the object, is parallel to its axis of rotation, and perpendicular to the plane of cross-section. On single inlet fans, drive side is always considered as the side opposite fan inlet (even when driven through fan inlet). Common fan types: centrifugal (“squirrel cage”), axial, special designs (including radial) Fan rotation direction (clockwise or counterclockwise) is important because the blades and housing are designed to direct flow only in one direction Pressure drop through the system must be known to choose a fan. Rotation Tests and Proved Results . Since air flows along the axis of rotation, the structure is kept compact. If, when looking at the rotor housing of the axial fan, the air blows towards you, this direction of air flow is given the designation "A" (otherwise "V"). 1. Centrifugal fans - direction of rotation explained by Henk de Swardt, Marthinusen & Coutts directional fan with straight blades. Six different fans were tested to conclude what rotation was best for winter or summer. The force owing to the axial load acts on the central axis of the object, and it can be a compressing or stretching force. Axial fans are named for the direction of the airflow they create. A reader in Japan also conducted the following physical test and we compared notes. They look like this . On double inlet fans with drives on both sides, drive side is that with the higher powered drive unit. 3. Mulfingen Type *4D 300 *4E 300 Motor M4D068-CF M4E068-CF VAC Hz m 3/h min-1 W A µF/VDB dB(A) Pa °C kg The propellers (fan blades) located in the circular flow path between the cylindrical hub and casing are used to force-feed air in order to generate air flow in the direction of the axis of rotation. Axial fans date back to the horizontally configured windmills of Europe in the Middle Ages. In these fans, the orientation of the blades (how they’re pitched) won’t affect the direction of the airflow. In these examples, the correct direction of rotation is clockwise as viewing the fans from the inlet side (as shown currently in the Figs). Direction of rotation is determined from drive side of fan (see Note 2 and 3). They are bent in a specific direction. Using these fans in the opposite direction from that shown here will The blades of the fan are not perfectly plane. The swirl component eventually dissipates, but by using Down Stream Guide Vanes (DSGV) it can be … Axial Fans. The first electrically powered fans, introduced in the 1880s, were axial fans. A normal axial flow fan, whilst being very economical and compact, imparts motion to the air in an axial and rotational direction. 2. AXIAL FLOW FANS 1.0 Definition of Axial Fans An axial flow fan moves air or gas parallel to the axis of rotation. They may be placed in three general classifications according to how the flow is constrained: • Ducted fan where the air has to flow through a duct thus encouraging it to enter and leave the impeller in an almost axial direction. Axial fans adhere closely to classical theory and require less “know-how” than centrifugal fans. • All fans had the same blade angle and the two settings operated the same way. Axial fans Impellers HyBlade Unique hybrid structure, combination of aluminum base material and glass-fiber reinforced plastic … By comparison, a centrifugal or radial flow fan moves air perpendicular to the axis of rotation. A centrifugal fan redirects the airflow perpendicular to the axis of rotation of the fan instead of just passing it through from one side to the other along the axis. 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axial fan rotation direction

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