| Specifications | Tad Krysiak |
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| Specifications | Tad Krysiak |
| Business section |
| Specifications | Tad Krysiak |
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| Content | 100 Hyde Road . Farmington, CT 06034 . Phone (860) 674-1515 . Fax (860) 674-8536 sales@us.ebmpapst.com . www.ebmpapst.us ebm-papst Inc. Press News The theory and practice of small fans (1) What is the correct type of fan: Axial, radial, diagonal? Fans are as varied in their construction as they are in their applications. These air-donors are primarily differentiated according the physical principle of the transfer of energy to the gas medium. Depending on the design, each fan is suitable for a number of different uses. In this article we will cover the different fan types, the physics appertaining to them and the practical effects that their design has. (An upcoming article is planned that will cover other distinguishing features, such as the selected drive motor, materials employed and the use of control electronics integrated into the fans). Air that is moved contains kinetic energy. This energy has to be applied to ambient air in order to create an airflow. Perhaps the best-known example of this is an aircraft propeller. A rotating profiled impeller transfers the shaft output to the air, creating a vectored airflow. However blower wheels with radial impellers and shafts with fins running lengthwise as well as hybrid designs are also suitable for gas delivery. Axial fans – lots of wind, not much pressure For axial fans, the propeller principle is employed. The airflow through the blower wheel with the (propeller) blades is conducted to a great extent parallel to the axis of rotation, hence the name axial fans. The rotating blades have a complex shape in order to achieve a good efficiency factor. As well as the curvature of the whole blade, (fig.1), its profile alters with the diameter. The reason for this is the rising circumferential velocity of the individual blade sections as the distance away from the drive shaft increases. Essentially the principle of operation can be described thus: The air is sucked in and flows from all parts of the room towards the inlet, during which the outer housing acts as the suction funnel. The inlet edges are therefore rounded. On the outlet side the air is forced out in the direction of |
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| Following Datasheets | Theory_2 (5 pages) thermal_management_solutions_for_medical_applications_brochure_009067-1-en_low_res_17jan12 (24 pages) thermal-1 (5 pages) thermal-3 (1 pages) thermal-4 (6 pages) Thermal-Behavior-Microelectronic-systems (10 pages) Thermal-Resistance-Pin-Fin_Heatsinks (8 pages) Thermal-Solutions-Brochure (8 pages) thermal-system_mg (1 pages) thermal (9 pages) |
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