BuildSysPro.IBPSA.Airflow.Multizone.BaseClasses.PartialOneWayFlowElement

# .BuildSysPro.IBPSA.Airflow.Multizone.BaseClasses.PartialOneWayFlowElement

Partial model for flow resistance with one-way flow

## Information

This partial model is used to model one way flow-elements. It holds the conservation equations and should be extended by definition of one of the following variables:

m_flow = mass flow rate trough the component

or

V_flow = volume flow rate through the component

The flow from A->B is the positive flow. The resulting equation should be in the `extends` statement, not in the equation section since this model sets both `m_flow = V_flow*rho` and `V_flow = m_flow/rho`.

## Revisions

- February 2, 2022, by Michael Wetter:
  Revised implementation.
  This is for IBPSA, #1436.
- Apr 06, 2021, by Klaas De Jonge:
  First implementation.

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