modelTable_m_flow

Mass flow(y-axis) vs Pressure(x-axis) cubic spline fit model based from table data, with last two points linearly interpolated

Extends from Buildings.Airflow.Multizone.BaseClasses.PartialOneWayFlowElement.

Information

This model describes the one-directional pressure driven air flow through an opening based on user-provided tabular data describing the relation between mass flow rate and pressure difference over the component.

ṁ = f(Δp),

where ṁ is the volume flow rate and Δp is the pressure difference.

Based on the table input, a cubic hermite spline is constructed between all points except for the two last pairs of points. These point are connected linearly.

The constructed curve is the direct relation between ṁ and Δp.

A similar model is also used in the CONTAM software (Dols and Walton, 2015).

References

  • W. S. Dols and B. J. Polidoro,2015. CONTAM User Guide and Program Documentation Version 3.2, National Institute of Standards and Technology, NIST TN 1887, Sep. 2015. doi: 10.6028/NIST.TN.1887.

Parameters

TypeNameDefaultDescription
Test data
Modelica.Units.SI.PressureDifference[:]dpMea_nominalPressure difference of test points
Modelica.Units.SI.MassFlowRate[:]mMea_flow_nominalMass flow rate of test points

Revisions

  • February 2, 2022, by Michael Wetter:
    Revised implementation.
    This is for IBPSA, #1436.
  • Apr 6, 2021, 2020, by Klaas De Jonge:
    First implementation.