Forward Curved Centrifugal Fan Efficiency

The characteristic curve of three kinds of centrifugal fan is shown in figure 2 15.

Forward curved centrifugal fan efficiency.

Forward curve sometimes referred to as a squirrel cage fan forward curve fans are used in most residential and light commercial hvac equipment. Forward curved centrifugal fans look more like hamster wheels and can create more air pressure. Centrifugal fans with forward curved blades. Forward blade backward blade and radial blade.

They utilize a much higher rpm than the rpm found in backward curved centrifugal fans but it s worth noting that they also usually have a lower efficiency. Centrifugal fans with forward curved blades always require a spiral housing. Because of this they tend to be noisier than axial fans and require more power to run. As a resistance to flow is applied to the suction or exhaust side of the fan the volume flow rate will drop.

When there is no pressure in the system the fan is blowing freely a forward curved centrifugal fan will produce the greatest volume flow. Their characteristic features are a low noise level relatively small air flow with a high increase in static pressure and space saving application. These fans are for low to medium static applications. Figure 1 centrifugal fan figure 2 axial fan each fan system has different types of wheels or impeller types.

These centrifugal fans are ideal for those companies looking for fans that can deliver medium to high airflow in their facilities. Because of this they tend to be noisier than axial fans and require more power to run. Generally centrifugal fans have three types of blade. They are suitable for high pressure applications as compared with axial flow fans.