BuildingSystems.Airflow.Multizone.Table_V_flow

# .BuildingSystems.Airflow.Multizone.Table_V_flow

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

## Information

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

V̇ = f(Δp),

where V̇ 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 V̇ 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.

## Revisions

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

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