Phase Equilibria Pressure Estimates Dialog
Applicability: Cranium, Synapse (core versions 0315+)

The Phase Equilibria Section uses the Phase Equilibria Pressure Estimates Dialog to view estimates and edit state variable values. The dialog is activated by clicking the left mouse button on the section's pressure estimates table control or by selecting the Edit Variables & Detail Estimates command from the section's pressure estimates table control commands menu. (See Estimates Commands Menu documentation for details.)

Dialog Controls

The Estimates dialog provides controls for displaying estimates, source information, editing state variable values, sorting estimates, and regressing values.

1
Table Control: displays the current list of phase equilibria estimates. Each row contains tie line, state variables, and (possibly) an estimated value. Clicking the left mouse button on a table row selects that table row. Clicking and holding the left mouse button down and then dragging the mouse will select several table rows. Double-clicking the left mouse button on a row selects the row and edits the contents of that row.
2
Technique Control: displays the name of the estimation technique which generated the currently selected estimate.
3
Comments Control: displays the comments associated with the currently selected estimate.
4
Edit Button: activates the Phase Equilibrium Estimate dialog enabling you to enter the estimate's state variables. See the Phase Equlibria Estimate Dailog documentation for details.
5
Commands Button: pressing the dialog's Commands button or clicking the right mouse button on the table control displays the commands menu. This menu provides standard commands for copying, pasting, and clearing state variables and estimates. See the documentation on Common Menu Commands for details.
6
Series Button: displays a menu allowing you to choose to generate a temperature or composition series. See below for documentation.
7
Sort Button: the dialog's Sort button will be enabled if two or more rows are selected. Pressing the Sort button activates the Sort Attribute dialog. This dialog enables you to sort estimates in ascending or descending order by the selected attribute.
8
Goal Seek Button: activates the Phase Equilibrium Goal Seek dialog. This dialog enables you to find state variable values that give a certain estimated value. See below for documentation.
9
Regress Button: activates the Values Regression Dialog enabling you to fit a variety of equations to the current estimates. See the Regress Values Dialog documentation for details.
10
Add Rows Button: pressing the Add Rows button will add rows to the bottom of the table control.
Commands Menu

Clicking the right mouse button within the table control or pressing the dialog's Commands button displays the estimates commands menu.

The menu's commands enable you to copy, cut and paste values to and from the table control. See Common Menu Commands for documentation on the commands commonly found on command menus.

Estimate Dialog

Clicking the left mouse button on a row in the table control or selecting a row and pressing the Edit button, activates the Phase Equilibrium Pressure Estimate Dialog. The dialog enables you to enter values for the tie line, compositions, and temperature. Click here for documentation.

Entering Series of State Variables

It is very common to desire estimates over a range of temperatures or compositions. Pressing the dialog's Series button displays a menu will commands for, depending upon the property being estimated, activating the:


Composition Series Dialog

The Composition Series Dialog enables you to generate a series of state variables consisting of a fixed pressure and compositions varying between specified limits. See the Phase Equilibria Composition Series Dialog documentation for details.


Temperature Series Dialog

The Temperature Series Dialog enables you to generate a series of state variables consisting of fixed compositions and temperature values varying between specified limits. See the Phase Equilibria Temperature Series Dialog documentation for details.

Goal Seek Dialog

Typically you first enter state variable values and then request the application to generate an estimated property value. Sometimes, the opposite process is desired - you specify a desired property value and ask the application to estimate the state variable values that would generate that estimate. The Pressure Goal Seek Dialog provides tools that enable you to make such estimations. See here for documentation.

Related Documentation
Topic Description
Getting Started using Synapse provides a quick tour of Synapse's capabilities including examples of chemical product design.
Getting Started using Cranium provides a quick tour of Cranium's capabilities including a discussion of structure editing.
Estimating Chemical Properties a short video demonstrating how to estimate the physical properties of chemicals using either Synapse or Cranium.
Estimating Mixture Properties a short video demonstrating how to estimate the physical properties of mixtures using either Synapse or Cranium.