Curves

About Curves

Curves allow you to create performance curves that you can then use in your model instances. You use the Curve Editor to define a Curve, which is tabular data with defined interpolations between the data points. You add independent and dependent variables to a Curve to provide the x-axis and y-axis information required for the performance curve. The independent variable appears on the x-axis, for example, flow. The dependent variables appear on the y-axis, for example, head or efficiency. Typically, you use Curves to define performance curves for pumps and compressors.

You may have multiple performance curves for a single dependent variable where each performance curve applies only to certain conditions, such as a defined compressor speed. In this case, you can use the Curve Editor to add Curve Sets to your Curve instead of creating multiple Curves for each condition. Curve Sets use specified parametric variables to define the conditions for their associated performance curves. Currently, due to limitations on the interpolation between the Curve Sets, we recommend that you use Curve Sets only to define performance curves for Compressors.

Concepts

• The independent variable appears on the x-axis

• Dependent variables appear on the y-axis

• Curve Sets allow you to define multiple performance curves for each dependent variable

• Parametric variables define the conditions for each Curve Set

Actions

• Add independent variables to a Curve

• Add dependent variables to a Curve

• Add parametric variables to a Curve

• Add Curve Sets to a Curve

• Add a background image to help accurately replicate a performance curve