Model that fits the flow coefficient of the massflow version of the
orifice equation based on 1 datapoint of mass flow rate and pressure difference, and given flow exponent.
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.

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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