Fan EnergySave Calculator
Fan Curve and System Curve Customize Fan Curve
Flow Control Config 1
The shape of the fan curve is defined by fitting a quadratic spline through the three points defined by the Static Pressure (at zero flow), the Nominal Pressure (at Nominal Flow) and a third point which can be positioned by the user. Use the input fields on the left and the slider below to vary the pump curve so that it best describes your application, i.e. the fan type (axial, centrifugal) and the blade arrangement (forward-curved, backward-curved, radial)
The efficiency curve is an empirical curve which models the mechanical fan losses along the fan curve.
If the fan operates at a constant speed the following control methods can be used
- Outlet damper control.
- On-Off Control
- Inlet-vane Control
The shape of the efficiency curve is an empirical 'one-size-fits-all' curve typical for grid-connected induction motors. The curve is scaled by the efficiency value specified by the Motor Efficiency user input in the left view.
The shape of the torque-speed curve is calculated from the nominal motor torque and slip under neglect of the stator resistance.
Variable-Speed-Drive (VFD) Operation
The two-dimensional efficiency surface is obtained using the reference machine (RM) and reference CDM (RCDM) from IEC EN 61800-9-2. The reference values in the entire torque-speed region are scaled by the efficiency specified in the efficiency classes, i.e. from IE3 to IE4 the motor losses in all operating points decrease by 80%.
The yellow triangles denote the fan operating points in the torque-speed region.
Use the Sliders to specify gaussian distributed Operating Points:
Use the Input Fields to the left to input a custom operating profile. The Operating Point Distribution is automatically updated. The user input is scaled so that the sum of all inputs is 100%.