Add a pure or petro component to a compositional Fluid Type

Expand the Component List and Component Browser sections, which allow you to define what your fluid is composed of.

If you know the library name of a pure component that you want to add to the Fluid Type, in the Component List section, do the following:

1. In the Add Component list, select the thermodynamic data bank that contains the pure components that you want to add.

   The default data bank is System:SIMSCI, which is the standard data bank in the default thermodynamic library that comes along with the AVEVA Process Simulation install.

2. In the Add Component box, enter the name, and then press Enter.

The Make a copy as a new user component checkbox is for creating a user-defined component. See Add user-defined components to a compositional Fluid Type for more information.

If you do not know the library name of a pure component that you want to add to the Fluid Type, in the Component Browser section, locate the pure component in the list and select to add the component to the Fluid Type.

Note: You can filter the components in the Component Browser section by data bank, name, formula, or property. See Filter components in the Component Browser for more information.

For petro components, do the following:

1. In the Component List section, select Add Petro Component .

2. Enter values for two of the three properties that characterize the petro component: NBP, SG60F, and MW.

   AVEVA Process Simulation calculates the remaining properties for the petro component and changes the name of the petro component based on the NBP value.

(Optional) Rename the components.

If you rename a component to include property data in its name, remember to update the name to reflect any changes that you make to the component properties. For example, if you include the true boiling point (TBP) data in the name of a petro component, you may want to rename the petro component if you change either of the properties that you used to characterize the petro component (which typically changes the calculated TBP for the component).

Set the Composition of each component.

Model Types can use these Composition values to initialize the fluid composition for their model instances. Model instances initialize their fluid composition only when you do the following:

• You first add the model instance to the simulation.

• You switch the Fluid Type in an existing model instance on the Canvas.

  The composition variables in the Model Type must have a certain model configuration to use the Composition values from the the Fluid Type. Specifically, the variables must use the [Fluid Type parameter].Composition variable as their default value, where [Fluid Type parameter] is a FluidType type of parameter that identifies the Fluid Type that you want to use.

  Unless the Fluid Type includes solid components or ions, any Mass Composition or Molar Composition type of variables use the normalized Composition values as their default values instead of the actual Composition values. We normalize the Composition values so that complicated model instances that use the Fluid Type do not have trouble finding an initial solution when you add them to your simulation.

  The Sum of Starting Compositions displays the sum of all the Composition values. If the Sum of Starting Compositions is not one, the Composition values in the Fluid Editor may not match the default composition in a model instance that uses the Fluid Type.

  We recommend that you always set the Composition values such that the Sum of Starting Compositions is one. This ensures that the initial composition for a model instance that uses the Fluid Type provides initial estimates that are robust enough to solve without convergence issues.

  There are no units of measure for the Composition values. When you add the Fluid Type to a model instance, the software uses the default units of measure for the compositions in the model instance without converting the Composition values.

  Changes to the composition in a model instance apply only to the model instance and do not propagate back to the Composition values in the Fluid Type.

  See Understand how a model instance uses the Composition values from its Fluid Type for more information.

If you are using Henry's Law for equilibrium calculations (that is, you select the Use Henry's Law checkbox in the Equilibrium Options section), in the Henry column, select the checkbox for each component that you want to use as a solute component.

AVEVA Process Simulation automatically selects the checkboxes for components with critical temperatures less than 400 K.

The Use Henry's Law checkbox is available only for Fluid Types that use the NRTL, eNRTL, UNIQUAC, Dortmund UNIFAC, or Wilson methods.

If you are using VLLE calculations (that is, you select Vapor/Liquid1/Liquid2 (VLLE) in the Phases list in the System section), in the LLE Key column, select the desired key components for the L1 and L2 liquid phases.

You can specify a key component for one or both of the liquid phases. However, we recommend that you specify a key component for both liquid phases if you want to specify a key component. See Key components for the liquid phases for more information.

If you are using a custom enthalpy route (that is, you select Custom in the Enthalpy/Entropy Route list in the Property Options section), do the following for each component:

1. In the Enthalpy Basis column, select the enthalpy basis that you want to use.

2. In the Ref T column, enter the reference temperature that you want to use.

3. In the Ref H column, enter the change in enthalpy from the system reference state to the reference state that you specify in the Ref T and Enthalpy Basis columns.

4. In the Phase Ch T column, enter the temperature at which the component changes phases to the supercritical region, Tc.

The Enthalpy/Entropy Route list is available only for Fluid Types that use the Ideal method or one of the liquid activity coefficient (LACT) methods.

See Changes to the enthalpy basis and reference state for components for more information.

(Optional) Expand the Component Data section, and then update the constant or temperature-dependent property data.

Any changes to the data in this section override the thermodynamic data from the default or custom pure component (PURECOMP) data banks that the Fluid Type uses. See Overrides for component property data for more information.