Compressor Efficiency Performance Curves

Single Efficiency Performance Curves

(Adiabatic and Polytropic Efficiency Curves)

The single efficiency performance curves describe the relation between inlet volumetric flow rate and the compressor efficiency. These curves can be based on either adiabatic efficiencies or polytropic efficiencies. The choice depends on the parameter selected for the pressure, work or head specification.

Fan Laws are applied to modify the efficiency curves when the operating speed of the compressor is different from the reference speed. The Fan Law's exponent has a default value of 1.0 which can be changed if needed.

Usage

From the Compressor Main Window...

1. Select the desired efficiency curve (adiabatic or polytropic) and push the Enter Curve button. The Efficiency Curve Window will be displayed.

From the Efficiency Curve Window...

2. Enter at least two different flowrate values and their corresponding efficiencies. Duplicate volumetric flowrate entries are not allowed. These values cannot be referenced using the Define system.

3. Change the Fan Law's exponent if desired.

4. Push the OK button to accept the entered values, or the Cancel button to cancel the operation performed. This returns you to the Compressor Main Window.

From the Compressor Main Window...

5. If the compressor's operating speed is different from the reference speed, enter values for Reference and Operating Speed parameters.

See Editing Tabular Data for additional information on editing operations for the efficiency table.

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