The backward curved blades must be operated at a much higher speed of rotation than the forward curved blades. The light construction results in a low cost fan and its relatively high airflow results in a small. Other fans such as axial, diagonal and forward curved centrifugal fans have areas in which operation is inadvisable. Performance analysis of backward curved centrifugal fan in. Centrifugal fans made by ebmpapst with forward curved blades. Fan types why choose a forward curved centrifugal fan. Carrier grade voice over ip by daniel collins pdf printer.
Wheels utilize formed forward curved high strength blades. Fan types why choose a backward curved centrifugal fan. Fans and blowers bureau of energy efficiency 94 figure 5. Forward curved blades, as in figure 3a, curve in the direction of the fan wheels rotation. In axial flow, air enters and leaves the fan with no change in direction propeller, tubeaxial. Sizes of this series are in accordance with amca standard 99009876 r20. When we have defined the volume flow rate that we require, whether this is to provide fresh air or process cooling, we need to combine this with the resistance to flow that the fan will encounter in the application. It is used for low pressure but with a large discharge use. The advantages of housing fans with forward curved blades come into their own where space is tight with low pressures and high flow rate. The fans are suitable for supply or extract applications in commercial, process and industrial hvac systems. Centrifugal fans can include either forward curved or backward curved impellers. Pdf study on the performance of a sirocco fan flow around the. The centrifugal fans have simple impeller construction with backward curved or forward blades.
Forward curved fc fans forward curved fan blades curve into the direction of wheel rotation, producing an air velocity at the blade tip. A sirocco fan is a centrifugal fan with a forward curved blade. Fans and blowers bureau of energy efficiency figure 5. A centrifugal fan is a mechanical device for moving air or other gases. Greenintelligence, we combine the highest energy efficiency with. The advantage of the forward curve fan is its low speed and quiet operation. Fda series double inlet forward curved centrifugal fans the fda series is didw centrifugal fans with forward curved impellers. Application of fans in commercial hvac equipment carrier corporation syracuse, new york may 20.