Performance characteristics
The essence of centrifugal fan is a constant pressure device with variable flow. When the speed is constant, the pressure flow theoretical curve of centrifugal fan should be a straight line. The actual characteristic curve is curved due to internal loss. The pressure produced in centrifugal fan is greatly affected by the change of inlet temperature or density. For a given intake air volume, the highest intake air temperature (the lowest air density) produces the lowest pressure. For a given pressure and flow characteristic curve, there is a power and flow characteristic curve. When the blower is running at a constant speed, the required power increases with the decrease of inlet air temperature for a given flow rate.
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