Override temperature-dependent property data

The Temperature Dependent tab contains a list of the temperature-dependent properties that you can change the data for. When you select a property, the property data for each component in the Fluid Type appears in a table next to the list. If you change the property data for any component, a blue badge appears next to the property name and the component name to indicate that you have locally overridden the property data.

Currently, you can override only the following temperature-dependent property data for pure components:

• Vapor Pressure

• Latent Heat

• Ideal Gas Heat Capacity

• Liquid Heat Capacity

• Solid Heat Capacity

• Liquid Density

• Solid Density

• Vapor Viscosity

• Liquid Viscosity

• Vapor Thermal Conductivity

• Liquid Thermal Conductivity

• Surface Tension

• Dielectric Constant

• Characteristic Volume

Currently, you can override only the following temperature-dependent property data for petro components:

• Vapor Pressure

• Latent Heat

• Ideal Gas Heat Capacity

• Liquid Heat Capacity

• Liquid Density

• Characteristic Volume

The Correlation column shows the temperature-dependent correlation that the software uses to calculate the property value. See Equation forms for temperature-dependent properties in AVEVA Thermodynamic Data Manager for more details on the correlations.

To provide more intuitive thermodynamic specifications, AVEVA Process Simulation shows correlations and coefficients for specific heat capacity instead of enthalpy. However, AVEVA Thermodynamic Data Manager (TDM) shows only the correlations and coefficients for enthalpy, and the specific heat capacity does not appear on the TempDep tab. If you want to view or change the correlation coefficients for the specific heat capacity, you must use the Temperature Dependent tab in the Component Data section of the Fluid Editor. You should use the derivative forms of the correlations to specify the coefficients for specific heat capacity. See Relationship between specific heat capacity and enthalpy for more information.

Override the temperature-dependent property data for pure components

1. In the Fluid Editor, expand the Component Data section, and then select the Temperature Dependent tab.

2. In the list of temperature-dependent properties, select the property whose data you want to change.

   The property data for each component appears in the table on the Temperature Dependent tab.

3. In the table, change the parameters as desired. See Equation forms for temperature-dependent properties in AVEVA Thermodynamic Data Manager if you have questions on how the software uses each parameter in the property calculations.

   A blue badge appears in the property list and in the data table for each property and component whose data you modify.

   Tip: You can return to the data bank value for any parameter by deleting the cell contents and then pressing Enter.

   

4. (Optional) Select the Plot checkbox for the modified components to view the thermophysical plot for those components and verify that your changes produce the correct temperature-dependent behavior. See View thermophysical plots for the temperature-dependent properties of pure components for more information.