.BuildingSystems.Fluid.Sensors.MassFractionTwoPort

Information

This model outputs the mass fraction of the passing fluid. The sensor is ideal, i.e. it does not influence the fluid. If the parameter tau is non-zero, then its output is computed using a first order differential equation. Setting tau=0 is not recommend. See BuildingSystems.Fluid.Sensors.UsersGuide for an explanation.

Revisions

• February 25, 2020, by Michael Wetter:
  Changed icon to display its operating state.
  This is for #1294.
• January 26, 2016, by Michael Wetter:
  Corrected wrong assignment XiVec[Medium.nXi](quantity=Medium.extraPropertiesNames) to XiVec[Medium.nXi](quantity=Medium.substanceNames[1:Medium.nXi]).
  Changed unit of output signal from 1 to kg/kg to indicate that it is a mass fraction, and declared the assignment final.
• January 18, 2016 by Filip Jorissen:
  Using parameter tauInv since this now exists in BuildingSystems.Fluid.Sensors.BaseClasses.PartialDynamicFlowSensor. This is for #372.
• September 10, 2013, by Michael Wetter:
  Changed min and max values for output signals to allow for numerical approximation error without violating these bounds.
  Changed medium declaration in the extends statement to replaceable to avoid a translation error in OpenModelica.
• August 31, 2013, by Michael Wetter:
  Revised model to use base class BuildingSystems.Fluid.BaseClasses.IndexMassFraction.
• November 3, 2011, by Michael Wetter:
  Moved der(X) := 0; from the initial algorithm section to the initial equation section as this assignment does not conform to the Modelica specification.
• June 3, 2011 by Michael Wetter:
  Revised implementation to add dynamics in such a way that the time constant increases as the mass flow rate tends to zero. This significantly improves the numerics.
• February 22, by Michael Wetter:
  Improved code that searches for index of the substance name in the medium model.
• Feb. 8, 2011 by Michael Wetter:
  First implementation.