.Buildings.Airflow.Multizone.BaseClasses.PartialOneWayFlowElement

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

• September 22, 2025, by Michael Wetter:
  Set unbounded=true for mExc_flow. This is to have the same implementation as in Buildings.Airflow.Multizone.BaseClasses.TwoWayFlowElement where this change was done to avoid spikes in port_a.m_flow in Buildings.Airflow.Multizone.Examples.OneOpenDoor.
  This is for Buildings, #4360.
• September 19, 2025, by Michael Wetter:
  Introduced protected parameter sqrt_dp_turbulent, which is needed to improve computing efficiency if flow exponent is 0.5.
  This is for IBPSA, #2043.
• February 2, 2022, by Michael Wetter:
  Revised implementation.
  This is for IBPSA, #1436.
• Apr 06, 2021, by Klaas De Jonge:
  First implementation.