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AVEVA™ Process Simulation

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Configure a Heat Curve

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  • Last UpdatedAug 01, 2025
  • 4 minute read

You can configure a Heat Curve so that it uses the Fluid, composition, temperature range, and pressure range of interest. You can also change the appearance of the Heat Curve on the graph.

Configure a Heat Curve based on a Fluid Type

  1. On the Canvas, double-click the Heat Curve to open it.

    The Heat Curve appears with an expanded configuration area.

  2. Expand the General section.

  3. In the Title box, enter the title of the graph.

  4. Select Mass Basis or Mole Basis to display mass-based or molar enthalpies and compositions, respectively.

  5. In the Legend list, select where you want the graph's legend to appear.

  6. In the Configuration section, select one of the following:

    • Fluid Type – Define the curve data based on a specified Fluid.

    • Stream – Define the curve data based on reference streams.

  7. If you selected Fluid Type, specify the Fluid Type that you want to view data for by doing one of the following:

    • In the Fluid Type list, select the Fluid Type.

    • From the Model Library, drag a Fluid Type onto the Heat Curve.

    AVEVA Process Simulation uses property data from the selected Fluid Type to initialize the Heat Curve configuration.

  8. If you selected Stream, do the following in the Stream row:

    1. In the Start box, enter the name of the stream that you want to reference.

      AVEVA Process Simulation uses the property and composition data from the Start stream to initialize the Heat Curve configuration, including the selected Fluid.

    2. (Optional) In the End box, enter the name of the stream that you want to reference.

      AVEVA Process Simulation updates the End temperature and pressure to match those of the End stream.

    The software calculates the enthalpy difference between the Start stream and End stream conditions (the heat duty). It then maintains that enthalpy difference when it calculates the isobaric heat curve. This allows you to design heat exchangers between the streams.

  9. Expand the Components List section.

    If the selected Fluid is not Compositional, no components appear in the table. Otherwise, the table shows all of the components in the Fluid as well as the initial composition from the Fluid or Start stream in the Composition column.

  10. In the Composition column, change the initial compositions as desired.

  11. In the Configuration section, in the table, in the Start and End columns, change the values for both temperature and pressure as desired.

    The Temperature row represents the temperature range for the Heat Curve, which affects the appearance of the curve on the T-H (temperature vs. enthalpy) tab.

    The Pressure row represents the pressure range for the Heat Curve, which affects the appearance of the curve on the P-H (pressure vs. enthalpy) tab.

  12. In the Start/End Margin box, enter the margin that you want to apply to the Start and End values for the temperature and pressure range.

    The applied margin is based on the Start value for the temperature and pressure, respectively. For the curve calculations, AVEVA Process Simulation decreases the Start value by the specified percentage of the Start value and increases the End value by that same value.

  13. In the Heat Curve Type list, select one of the following values:

    • Single – Display a single temperature vs. enthalpy curve and a single pressure vs. enthalpy curve.

    • MultipleIsobaric – Display multiple isobaric temperature vs. enthalpy curves across the entire pressure range.

  14. If you selected MultipleIsobaric, in the Number of Isobaric Curves box, enter the number of isobaric curves that you want to display for the specified pressure range.

    AVEVA Process Simulation uses the same pressure interval between each isobaric curve. Therefore, the Number of Isobaric Curves value determines the pressure for each isobaric curve between the Start and End pressures.

  15. In the Evaluation Intervals box, enter the number of data points that you want to include in the heat curve calculations.

    Nonlinear portions of the Heat Curve may look linear and piecewise on the graph if you do not use a sufficient number of data points.

    This value also determines the number of data points that appear in any Microsoft Excel reports or HTRI data (.dat) files that you generate for the Heat Curve. However, an HTRI data file includes only the first 30 data points in the Heat Curve. See Export Heat Curve data to an Excel report and Export Heat Curve data to an HTRI data file for more information.

  16. In the Evaluation Spacing Options list, select one of the following options:

    • Equal Temperature – The data points increment by the same step change in temperature for the entire data set.

    • Equal Enthalpies – The data points increment by the same step change in enthalpy for the entire data set.

    This value also determines how the data points increment in any Microsoft Excel reports or HRTI data files that you generate for the Heat Curve. See Export Heat Curve data to an Excel report and Export Heat Curve data to an HTRI data file for more information.

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