BuildingSystems.Fluid.Sources.MassFlowSource_h

# .BuildingSystems.Fluid.Sources.MassFlowSource_h

Ideal flow source that produces a prescribed mass flow with prescribed specific enthalpy, composition and trace substances

## Information

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

- Prescribed mass flow rate.
- Prescribed specific enthalpy.
- Boundary composition (only for multi-substance or trace-substance flow).

If `use_m_flow_in` is false (default option), the `m_flow` parameter is used as boundary pressure, 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 specific enthalpy h, composition Xi or X and trace substances C.

#### Options

Instead of using `Xi_in` (the independent composition fractions), the advanced tab provides an option for setting all composition fractions using `X_in`. `use_X_in` and `use_Xi_in` cannot be used at the same time.

Parameter `verifyInputs` can be set to `true` to enable a check that verifies the validity of the used specific enthalpy and pressures. This removes the corresponding overhead from the model, which is a substantial part of the overhead of this model. See #882 for more information.

Note, that boundary specific enthalpy, 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.
- February 2nd, 2018 by Filip Jorissen
  Made `medium` conditional and refactored inputs. See #882.
- April 18, 2017, by Filip Jorissen:
  Changed `checkBoundary` implementation such that it is run as an initial equation when it depends on parameters only. See #728.
- January 26, 2016, by Michael Wetter:
  Added `unit` and `quantity` attributes.
- May 29, 2014, by Michael Wetter:
  Removed undesirable annotation `Evaluate=true`.
- September 29, 2009, by Michael Wetter:
  First implementation. Implemenation is based on `Modelica.Fluid`.

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