Study on Energy Saving Characteristics and Mechanism of Centrifugal Fan with Flap Adjusting

In order to improve the adjustment operation economy of the ventilator, a flap adjustment was conducted on the centrifugal impeller.A study was made 0 n the flap and front guider adjustment of the centrifugal ventilator, the running blade adjustment of the axial ventilator, and the ventilator efficiency, pipeline efficiency, s ystem efficiency and energy saving efficiency during the throttle adjustment.A comprehensive feature curve of the operation economy for the adjustment was obtained.T he study results showed that when the flow variation of the ventilator was at 66.3% 1 13.8%, during the flap adjustment, the average system efficiency of the ventilator W ould be higher than 79.9%, the average adjustment efficiency would be higher than 91.9% and generally the system efficiency and adjustment efficiency would be high t han the running blade adjustment and the front guider adjustment.When the flow of the ventilator was highly reduced, the advantage of the flap adjustment would be ob vious.Meanwhile the G4-73 centrifugal ventilator with the front guider was replaced with flap adjustment, when the flow reduced to 70%, the energy saving rate would b e 28.9%.Thus the operation economy of the centrifugal fan with the flap adjustment would be good.