.Modelica.Fluid.Dissipation.Utilities.SharedDocumentation.PressureLoss.General.dp_pressureLossCoefficient

Information

Calculation of a generic pressure loss in dependence of a pressure loss coefficient.

Calculation

The mass flow rate m_flow is determined by:

    m_flow = rho*A_cross*(dp/(zeta_TOT *(rho/2))^0.5

with

A_cross	as cross sectional area [m2],
dp	as pressure loss [Pa],
rho	as density of fluid [kg/m3],
m_flow	as mass flow rate [kg/s],
zeta_TOT	as pressure loss coefficient [-].

Verification

Compressible case [Mass flow rate = f(dp)]:

The mass flow rate M_FLOW in dependence of the pressure loss dp for a constant pressure loss coefficient zeta_TOT is shown in the figure below.

fig_general_dp_pressureLossCoefficient_MFLOWvsDP

Note that the verification for dp_pressureLossCoefficient is also valid for this inverse calculation due to using the same functions.

References

Elmqvist, H., M.Otter and S.E. Cellier:: Inline integration: A new mixed symbolic / numeric approach for solving differential-algebraic equation systems.. In Proceedings of European Simulation MultiConference, Praque, 1995.
Wischhusen, S.:: Dynamische Simulation zur wirtschaftlichen Bewertung von komplexen Energiesystemen.. PhD thesis, Technische Universität Hamburg-Harburg, 2005.

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