Typically you first enter state variable values and then request Cranium or Synapse 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.
For example, the estimated vapor pressures shown below are all 15 kPa apart. Each vapor pressure was entered as a goal value and the temperature was varied until the goal value was matched.
The Goal Seek dialog has controls for entering an initial temperature value, a goal value, and for performing the goal seek operation.
|Initial Temperature Control: enables you to enter an initial guess for the temperature.
|Property Control: displays the property being estimated.
|Goal Control: enables you to enter your goal physical property value.
|Value Control: displays the value estimated given the current temperature. This value should start approaching the goal value as the solution process proceeds.
|Delta Control: displays the difference between the goal value and the current estimated value. This value should approach zero as the solution process proceeds.
|Start Seek Button: pressing this button starts the solution process.
It is sometimes necessary to have a very good initial guess in order to find a successful goal seek solution. One way you can often get a good initial is by estimating some values at temperature values near those you expect for goal value.
You can use these estimated values as your initial guess by simply selecting them in the Estimates Dialog and pressing the Goal Seek button. The selected temperature will be assign to the Goal Seek dialog's controls.
|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.