.BuildingSystems.Fluid.Sources.MassFlowSource_WeatherData

Information

Models an ideal flow source, with prescribed values of flow rate and trace substances, with temperature and specific enthalpy from outside:

• Prescribed mass flow rate.
• Boundary composition (trace-substance flow).
• Outside specific enthalpy.
• Multi-substance composition (e.g. water vapor) from outside.

If use_m_flow_in is false (default option), the m_flow parameter is used as boundary flow rate, and the m_flow_in input connector is disabled; if use_m_flow_in is true, then the m_flow parameter is ignored, and the value provided by the input connector is used instead.

The same applies to the trace substances.

The BuildingSystems.Utilities.Psychrometrics.X_pTphi block is used with the input data including pAtm, TDryBul, relHum from weather bus weaBus, to calculate X.

The same applies to the specific enthalpy.

Note, that boundary temperature, mass fractions and trace substances have only an effect if the mass flow is from the boundary into the port. If mass is flowing from the port into the boundary, the boundary definitions, with exception of boundary flow rate, do not have an effect.

Revisions

• March 11, 2024, by Michael Wetter:
  Corrected use of HideResult.
  This is for #1850.
• January 09, 2023, by Jianjun Hu:
  Changed base class to constrain medium to moist air.
  This is for IBPSA, #1681.
• November 14, 2019, by Michael Wetter:
  Removed duplicate connector.
  This is for #1248.
• January 14, 2019 by Jianjun Hu:
  Changed to extend BuildingSystems.Fluid.Sources.BaseClasses.PartialSource. This is for #1050.
• May 21, 2017, by Jianjun Hu:
  First implementation. Created flow source with prescribed mass flow and trace substances, outside enthalpy and composition. Weather bus is used. See #777.