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Determine Model Solvability

The Sigmafine Mass Balance analysis first examines the measurement information that is available and determines what can be calculated from this data. Elements that are marked "out-of-service" are excluded as possible paths. In addition, if the balance setting 'Propagate service status' is selected, all flows coming in and out of a node that is out of service will also be considered out of service. Likewise, if all flows going to/from a node are out of service then, the node will also be considered out of service.

If a measurement is not available on a quantity or mass flow, it may be possible to calculate it if enough of the surrounding flows are measured. This first step of analysis assigns the following solvability status to all flows.

Mass Flow​

  • R – The flow mass is redundant as it is both measured and solvable.
  • NR – The flow mass is measured, but not redundant.
  • S – The flow mass is solvable.
  • NS – The flow mass is not solvable.

The solvability status is stored in an Attribute of the flows. The default name of this Attribute is "ReconciledMassSolvability."

Refer to Solvability Examples for some sample configurations and the corresponding solvability results.