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Determine Model Solvability

The Energy Balance Analysis first examines the measurement information that is available and determines what can be calculated from this data. This can be any quantity, but the example uses mass. 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 are considered to be 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. Redundancy for non -linear balances is a numeric approximation. The examples are linear. Energy can create redundancy of the linear quantity balance.

If a measurement is not available on a 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.

  • 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 Attributes of the flows. The default name of this Attribute for the quantity is ReconciledMassSolvability. For the energy, the solvability is stored in the Attribute ReconciledEnergySolvability.

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