Modelica.Fluid.Sources

Define fixed or prescribed boundary conditions

Information

Package Sources contains generic sources for fluid connectors to define fixed or prescribed ambient conditions.

Extends from Modelica.Fluid.Icons.VariantLibrary (Icon for a library that contains several variants of one component).

Package Content

Name Description

FixedBoundary Boundary source component

Boundary_pT Boundary with prescribed pressure, temperature, composition and trace substances

Boundary_ph Boundary with prescribed pressure, specific enthalpy, composition and trace substances

MassFlowSource_T Ideal flow source that produces a prescribed mass flow with prescribed temperature, mass fraction and trace substances

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

BaseClasses Base classes used in the Sources package (only of interest to build new component models)

Name	Description
FixedBoundary	Boundary source component
Boundary_pT	Boundary with prescribed pressure, temperature, composition and trace substances
Boundary_ph	Boundary with prescribed pressure, specific enthalpy, composition and trace substances
MassFlowSource_T	Ideal flow source that produces a prescribed mass flow with prescribed temperature, mass fraction and trace substances
MassFlowSource_h	Ideal flow source that produces a prescribed mass flow with prescribed specific enthalpy, mass fraction and trace substances
BaseClasses	Base classes used in the Sources package (only of interest to build new component models)

Modelica.Fluid.Sources.FixedBoundary

Boundary source component

Modelica.Fluid.Sources.FixedBoundary

Information

Model FixedBoundary defines constant values for boundary conditions:

Boundary pressure or boundary density.
Boundary temperature or boundary specific enthalpy.
Boundary composition (only for multi-substance or trace-substance flow).

Note, that boundary temperature, density, 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 pressure, do not have an effect.

Extends from Sources.BaseClasses.PartialSource (Partial component source with one fluid connector).

Parameters

Type Name Default Description

replaceable package Medium PartialMedium Medium model within the source

Boundary pressure or Boundary density

Boolean use_p true select p or d

AbsolutePressure p Medium.p_default Boundary pressure [Pa]

Density d Medium.density_pTX(Medium.p_... Boundary density [kg/m3]

Boundary temperature or Boundary specific enthalpy

Boolean use_T true select T or h

Temperature T Medium.T_default Boundary temperature [K]

SpecificEnthalpy h Medium.h_default Boundary specific enthalpy [J/kg]

Only for multi-substance flow

MassFraction X[Medium.nX] Medium.X_default Boundary mass fractions m_i/m [kg/kg]

Only for trace-substance flow

ExtraProperty C[Medium.nC] fill(0, Medium.nC) Boundary trace substances

Type	Name	Default	Description
replaceable package Medium	PartialMedium	Medium model within the source
Boundary pressure or Boundary density
Boolean	use_p	true	select p or d
AbsolutePressure	p	Medium.p_default	Boundary pressure [Pa]
Density	d	Medium.density_pTX(Medium.p_...	Boundary density [kg/m3]
Boundary temperature or Boundary specific enthalpy
Boolean	use_T	true	select T or h
Temperature	T	Medium.T_default	Boundary temperature [K]
SpecificEnthalpy	h	Medium.h_default	Boundary specific enthalpy [J/kg]
Only for multi-substance flow
MassFraction	X[Medium.nX]	Medium.X_default	Boundary mass fractions m_i/m [kg/kg]
Only for trace-substance flow
ExtraProperty	C[Medium.nC]	fill(0, Medium.nC)	Boundary trace substances

Connectors

Type Name Description

FluidPorts_b ports[nPorts]

Type	Name	Description
FluidPorts_b	ports[nPorts]

Modelica definition

model FixedBoundary "Boundary source component"
  extends Sources.BaseClasses.PartialSource;
  parameter Boolean use_p=true "select p or d";
  parameter Medium.AbsolutePressure p=Medium.p_default "Boundary pressure";
  parameter Medium.Density d=Medium.density_pTX(Medium.p_default, Medium.T_default, Medium.X_default) 
    "Boundary density";
  parameter Boolean use_T=true "select T or h";
  parameter Medium.Temperature T=Medium.T_default "Boundary temperature";
  parameter Medium.SpecificEnthalpy h=Medium.h_default 
    "Boundary specific enthalpy";
  parameter Medium.MassFraction X[Medium.nX](
       quantity=Medium.substanceNames)=Medium.X_default 
    "Boundary mass fractions m_i/m";

  parameter Medium.ExtraProperty C[Medium.nC](
       quantity=Medium.extraPropertiesNames)=fill(0, Medium.nC) 
    "Boundary trace substances";

equation 
  Modelica.Fluid.Utilities.checkBoundary(Medium.mediumName, Medium.substanceNames,
                                        Medium.singleState, use_p, X,
                                        "FixedBoundary");
  if use_p or Medium.singleState then
    medium.p = p;
  else
    medium.d = d;
  end if;
  if use_T then
    medium.T = T;
  else
    medium.h = h;
  end if;

  medium.Xi = X[1:Medium.nXi];

  ports.C_outflow = fill(C, nPorts);
end FixedBoundary;

Modelica.Fluid.Sources.Boundary_pT

Boundary with prescribed pressure, temperature, composition and trace substances

Modelica.Fluid.Sources.Boundary_pT

Information

Defines prescribed values for boundary conditions:

Prescribed boundary pressure.
Prescribed boundary temperature.
Boundary composition (only for multi-substance or trace-substance flow).

If use_p_in is false (default option), the p parameter is used as boundary pressure, and the p_in input connector is disabled; if use_p_in is true, then the p parameter is ignored, and the value provided by the input connector is used instead.

The same thing goes for the temperature, composition and trace substances.

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 pressure, do not have an effect.

Extends from Sources.BaseClasses.PartialSource (Partial component source with one fluid connector).

Parameters

Type Name Default Description

replaceable package Medium PartialMedium Medium model within the source

Boolean use_p_in false Get the pressure from the input connector

Boolean use_T_in false Get the temperature from the input connector

Boolean use_X_in false Get the composition from the input connector

Boolean use_C_in false Get the trace substances from the input connector

AbsolutePressure p Medium.p_default Fixed value of pressure [Pa]

Temperature T Medium.T_default Fixed value of temperature [K]

MassFraction X[Medium.nX] Medium.X_default Fixed value of composition [kg/kg]

ExtraProperty C[Medium.nC] fill(0, Medium.nC) Fixed values of trace substances

Type	Name	Default	Description
replaceable package Medium	PartialMedium	Medium model within the source
Boolean	use_p_in	false	Get the pressure from the input connector
Boolean	use_T_in	false	Get the temperature from the input connector
Boolean	use_X_in	false	Get the composition from the input connector
Boolean	use_C_in	false	Get the trace substances from the input connector
AbsolutePressure	p	Medium.p_default	Fixed value of pressure [Pa]
Temperature	T	Medium.T_default	Fixed value of temperature [K]
MassFraction	X[Medium.nX]	Medium.X_default	Fixed value of composition [kg/kg]
ExtraProperty	C[Medium.nC]	fill(0, Medium.nC)	Fixed values of trace substances

Connectors

Type Name Description

FluidPorts_b ports[nPorts]

input RealInput p_in Prescribed boundary pressure

input RealInput T_in Prescribed boundary temperature

input RealInput X_in[Medium.nX] Prescribed boundary composition

input RealInput C_in[Medium.nC] Prescribed boundary trace substances

Type	Name	Description
FluidPorts_b	ports[nPorts]
input RealInput	p_in	Prescribed boundary pressure
input RealInput	T_in	Prescribed boundary temperature
input RealInput	X_in[Medium.nX]	Prescribed boundary composition
input RealInput	C_in[Medium.nC]	Prescribed boundary trace substances

Modelica definition

model Boundary_pT 
  "Boundary with prescribed pressure, temperature, composition and trace substances"
  extends Sources.BaseClasses.PartialSource;
  parameter Boolean use_p_in = false 
    "Get the pressure from the input connector";
  parameter Boolean use_T_in= false 
    "Get the temperature from the input connector";
  parameter Boolean use_X_in = false 
    "Get the composition from the input connector";
  parameter Boolean use_C_in = false 
    "Get the trace substances from the input connector";
  parameter Medium.AbsolutePressure p = Medium.p_default 
    "Fixed value of pressure";
  parameter Medium.Temperature T = Medium.T_default 
    "Fixed value of temperature";
  parameter Medium.MassFraction X[Medium.nX] = Medium.X_default 
    "Fixed value of composition";
  parameter Medium.ExtraProperty C[Medium.nC](
       quantity=Medium.extraPropertiesNames)=fill(0, Medium.nC) 
    "Fixed values of trace substances";
  Modelica.Blocks.Interfaces.RealInput p_in if              use_p_in 
    "Prescribed boundary pressure";
  Modelica.Blocks.Interfaces.RealInput T_in if         use_T_in 
    "Prescribed boundary temperature";
  Modelica.Blocks.Interfaces.RealInput X_in[Medium.nX] if 
                                                        use_X_in 
    "Prescribed boundary composition";
  Modelica.Blocks.Interfaces.RealInput C_in[Medium.nC] if 
                                                        use_C_in 
    "Prescribed boundary trace substances";
protected 
  Modelica.Blocks.Interfaces.RealInput p_in_internal 
    "Needed to connect to conditional connector";
  Modelica.Blocks.Interfaces.RealInput T_in_internal 
    "Needed to connect to conditional connector";
  Modelica.Blocks.Interfaces.RealInput X_in_internal[Medium.nX] 
    "Needed to connect to conditional connector";
  Modelica.Blocks.Interfaces.RealInput C_in_internal[Medium.nC] 
    "Needed to connect to conditional connector";
equation 
  Modelica.Fluid.Utilities.checkBoundary(Medium.mediumName, Medium.substanceNames,
    Medium.singleState, true, X_in_internal, "Boundary_pT");
  connect(p_in, p_in_internal);
  connect(T_in, T_in_internal);
  connect(X_in, X_in_internal);
  connect(C_in, C_in_internal);
  if not use_p_in then
    p_in_internal = p;
  end if;
  if not use_T_in then
    T_in_internal = T;
  end if;
  if not use_X_in then
    X_in_internal = X;
  end if;
  if not use_C_in then
    C_in_internal = C;
  end if;
  medium.p = p_in_internal;
  medium.T = T_in_internal;
  medium.Xi = X_in_internal[1:Medium.nXi];
  ports.C_outflow = fill(C_in_internal, nPorts);
end Boundary_pT;

Modelica.Fluid.Sources.Boundary_ph

Boundary with prescribed pressure, specific enthalpy, composition and trace substances

Modelica.Fluid.Sources.Boundary_ph

Information

Defines prescribed values for boundary conditions:

Prescribed boundary pressure.
Prescribed boundary temperature.
Boundary composition (only for multi-substance or trace-substance flow).

The same thing goes for the specific enthalpy and composition

Extends from Sources.BaseClasses.PartialSource (Partial component source with one fluid connector).

Parameters

Type Name Default Description

replaceable package Medium PartialMedium Medium model within the source

Boolean use_p_in false Get the pressure from the input connector

Boolean use_h_in false Get the specific enthalpy from the input connector

Boolean use_X_in false Get the composition from the input connector

Boolean use_C_in false Get the trace substances from the input connector

AbsolutePressure p Medium.p_default Fixed value of pressure [Pa]

SpecificEnthalpy h Medium.h_default Fixed value of specific enthalpy [J/kg]

MassFraction X[Medium.nX] Medium.X_default Fixed value of composition [kg/kg]

ExtraProperty C[Medium.nC] fill(0, Medium.nC) Fixed values of trace substances

Type	Name	Default	Description
replaceable package Medium	PartialMedium	Medium model within the source
Boolean	use_p_in	false	Get the pressure from the input connector
Boolean	use_h_in	false	Get the specific enthalpy from the input connector
Boolean	use_X_in	false	Get the composition from the input connector
Boolean	use_C_in	false	Get the trace substances from the input connector
AbsolutePressure	p	Medium.p_default	Fixed value of pressure [Pa]
SpecificEnthalpy	h	Medium.h_default	Fixed value of specific enthalpy [J/kg]
MassFraction	X[Medium.nX]	Medium.X_default	Fixed value of composition [kg/kg]
ExtraProperty	C[Medium.nC]	fill(0, Medium.nC)	Fixed values of trace substances

Connectors

Type Name Description

FluidPorts_b ports[nPorts]

input RealInput p_in Prescribed boundary pressure

input RealInput h_in Prescribed boundary specific enthalpy

input RealInput X_in[Medium.nX] Prescribed boundary composition

input RealInput C_in[Medium.nC] Prescribed boundary trace substances

Type	Name	Description
FluidPorts_b	ports[nPorts]
input RealInput	p_in	Prescribed boundary pressure
input RealInput	h_in	Prescribed boundary specific enthalpy
input RealInput	X_in[Medium.nX]	Prescribed boundary composition
input RealInput	C_in[Medium.nC]	Prescribed boundary trace substances

Modelica definition

model Boundary_ph 
  "Boundary with prescribed pressure, specific enthalpy, composition and trace substances"
  extends Sources.BaseClasses.PartialSource;
  parameter Boolean use_p_in = false 
    "Get the pressure from the input connector";
  parameter Boolean use_h_in= false 
    "Get the specific enthalpy from the input connector";
  parameter Boolean use_X_in = false 
    "Get the composition from the input connector";
  parameter Boolean use_C_in = false 
    "Get the trace substances from the input connector";
  parameter Medium.AbsolutePressure p = Medium.p_default 
    "Fixed value of pressure";
  parameter Medium.SpecificEnthalpy h = Medium.h_default 
    "Fixed value of specific enthalpy";
  parameter Medium.MassFraction X[Medium.nX] = Medium.X_default 
    "Fixed value of composition";
  parameter Medium.ExtraProperty C[Medium.nC](
       quantity=Medium.extraPropertiesNames)=fill(0, Medium.nC) 
    "Fixed values of trace substances";
  Modelica.Blocks.Interfaces.RealInput p_in if              use_p_in 
    "Prescribed boundary pressure";
  Modelica.Blocks.Interfaces.RealInput h_in if              use_h_in 
    "Prescribed boundary specific enthalpy";
  Modelica.Blocks.Interfaces.RealInput X_in[Medium.nX] if 
                                                        use_X_in 
    "Prescribed boundary composition";
  Modelica.Blocks.Interfaces.RealInput C_in[Medium.nC] if 
                                                        use_C_in 
    "Prescribed boundary trace substances";
protected 
  Modelica.Blocks.Interfaces.RealInput p_in_internal 
    "Needed to connect to conditional connector";
  Modelica.Blocks.Interfaces.RealInput h_in_internal 
    "Needed to connect to conditional connector";
  Modelica.Blocks.Interfaces.RealInput X_in_internal[Medium.nX] 
    "Needed to connect to conditional connector";
  Modelica.Blocks.Interfaces.RealInput C_in_internal[Medium.nC] 
    "Needed to connect to conditional connector";
equation 
  Modelica.Fluid.Utilities.checkBoundary(Medium.mediumName, Medium.substanceNames,
    Medium.singleState, true, X_in_internal, "Boundary_ph");
  connect(p_in, p_in_internal);
  connect(h_in, h_in_internal);
  connect(X_in, X_in_internal);
  connect(C_in, C_in_internal);
  if not use_p_in then
    p_in_internal = p;
  end if;
  if not use_h_in then
    h_in_internal = h;
  end if;
  if not use_X_in then
    X_in_internal = X;
  end if;
  if not use_C_in then
    C_in_internal = C;
  end if;
  medium.p = p_in_internal;
  medium.h = h_in_internal;
  medium.Xi = X_in_internal[1:Medium.nXi];
  ports.C_outflow = fill(C_in_internal, nPorts);
end Boundary_ph;

Modelica.Fluid.Sources.MassFlowSource_T

Ideal flow source that produces a prescribed mass flow with prescribed temperature, mass fraction and trace substances

Modelica.Fluid.Sources.MassFlowSource_T

Information

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

Prescribed mass flow rate.
Prescribed temperature.
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 thing goes for the temperature and composition

Extends from Sources.BaseClasses.PartialSource (Partial component source with one fluid connector).

Parameters

Type Name Default Description

replaceable package Medium PartialMedium Medium model within the source

Boolean use_m_flow_in false Get the mass flow rate from the input connector

Boolean use_T_in false Get the temperature from the input connector

Boolean use_X_in false Get the composition from the input connector

Boolean use_C_in false Get the trace substances from the input connector

MassFlowRate m_flow 0 Fixed mass flow rate going out of the fluid port [kg/s]

Temperature T Medium.T_default Fixed value of temperature [K]

MassFraction X[Medium.nX] Medium.X_default Fixed value of composition [kg/kg]

ExtraProperty C[Medium.nC] fill(0, Medium.nC) Fixed values of trace substances

Type	Name	Default	Description
replaceable package Medium	PartialMedium	Medium model within the source
Boolean	use_m_flow_in	false	Get the mass flow rate from the input connector
Boolean	use_T_in	false	Get the temperature from the input connector
Boolean	use_X_in	false	Get the composition from the input connector
Boolean	use_C_in	false	Get the trace substances from the input connector
MassFlowRate	m_flow	0	Fixed mass flow rate going out of the fluid port [kg/s]
Temperature	T	Medium.T_default	Fixed value of temperature [K]
MassFraction	X[Medium.nX]	Medium.X_default	Fixed value of composition [kg/kg]
ExtraProperty	C[Medium.nC]	fill(0, Medium.nC)	Fixed values of trace substances

Connectors

Type Name Description

FluidPorts_b ports[nPorts]

input RealInput m_flow_in Prescribed mass flow rate

input RealInput T_in Prescribed fluid temperature

input RealInput X_in[Medium.nX] Prescribed fluid composition

input RealInput C_in[Medium.nC] Prescribed boundary trace substances

Type	Name	Description
FluidPorts_b	ports[nPorts]
input RealInput	m_flow_in	Prescribed mass flow rate
input RealInput	T_in	Prescribed fluid temperature
input RealInput	X_in[Medium.nX]	Prescribed fluid composition
input RealInput	C_in[Medium.nC]	Prescribed boundary trace substances

Modelica definition

model MassFlowSource_T 
  "Ideal flow source that produces a prescribed mass flow with prescribed temperature, mass fraction and trace substances"
  extends Sources.BaseClasses.PartialSource;
  parameter Boolean use_m_flow_in = false 
    "Get the mass flow rate from the input connector";
  parameter Boolean use_T_in= false 
    "Get the temperature from the input connector";
  parameter Boolean use_X_in = false 
    "Get the composition from the input connector";
  parameter Boolean use_C_in = false 
    "Get the trace substances from the input connector";
  parameter Medium.MassFlowRate m_flow = 0 
    "Fixed mass flow rate going out of the fluid port";
  parameter Medium.Temperature T = Medium.T_default 
    "Fixed value of temperature";
  parameter Medium.MassFraction X[Medium.nX] = Medium.X_default 
    "Fixed value of composition";
  parameter Medium.ExtraProperty C[Medium.nC](
       quantity=Medium.extraPropertiesNames)=fill(0, Medium.nC) 
    "Fixed values of trace substances";
  Modelica.Blocks.Interfaces.RealInput m_flow_in if     use_m_flow_in 
    "Prescribed mass flow rate";
  Modelica.Blocks.Interfaces.RealInput T_in if         use_T_in 
    "Prescribed fluid temperature";
  Modelica.Blocks.Interfaces.RealInput X_in[Medium.nX] if 
                                                        use_X_in 
    "Prescribed fluid composition";
  Modelica.Blocks.Interfaces.RealInput C_in[Medium.nC] if 
                                                        use_C_in 
    "Prescribed boundary trace substances";
protected 
  Modelica.Blocks.Interfaces.RealInput m_flow_in_internal 
    "Needed to connect to conditional connector";
  Modelica.Blocks.Interfaces.RealInput T_in_internal 
    "Needed to connect to conditional connector";
  Modelica.Blocks.Interfaces.RealInput X_in_internal[Medium.nX] 
    "Needed to connect to conditional connector";
  Modelica.Blocks.Interfaces.RealInput C_in_internal[Medium.nC] 
    "Needed to connect to conditional connector";
equation 
  Utilities.checkBoundary(Medium.mediumName, Medium.substanceNames,
    Medium.singleState, true, X_in_internal, "MassFlowSource_T");
  connect(m_flow_in, m_flow_in_internal);
  connect(T_in, T_in_internal);
  connect(X_in, X_in_internal);
  connect(C_in, C_in_internal);
  if not use_m_flow_in then
    m_flow_in_internal = m_flow;
  end if;
  if not use_T_in then
    T_in_internal = T;
  end if;
  if not use_X_in then
    X_in_internal = X;
  end if;
  if not use_C_in then
    C_in_internal = C;
  end if;
  sum(ports.m_flow) = -m_flow_in_internal;
  medium.T = T_in_internal;
  medium.Xi = X_in_internal[1:Medium.nXi];
  ports.C_outflow = fill(C_in_internal, nPorts);
end MassFlowSource_T;

Modelica.Fluid.Sources.MassFlowSource_h

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

Modelica.Fluid.Sources.MassFlowSource_h

Information

Models an ideal flow source, with prescribed values of flow rate, temperature and composition:

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

The same thing goes for the temperature and composition

Extends from Sources.BaseClasses.PartialSource (Partial component source with one fluid connector).

Parameters

Type Name Default Description

replaceable package Medium PartialMedium Medium model within the source

Boolean use_m_flow_in false Get the mass flow rate from the input connector

Boolean use_h_in false Get the specific enthalpy from the input connector

Boolean use_X_in false Get the composition from the input connector

Boolean use_C_in false Get the trace substances from the input connector

MassFlowRate m_flow 0 Fixed mass flow rate going out of the fluid port [kg/s]

SpecificEnthalpy h Medium.h_default Fixed value of specific enthalpy [J/kg]

MassFraction X[Medium.nX] Medium.X_default Fixed value of composition [kg/kg]

ExtraProperty C[Medium.nC] fill(0, Medium.nC) Fixed values of trace substances

Type	Name	Default	Description
replaceable package Medium	PartialMedium	Medium model within the source
Boolean	use_m_flow_in	false	Get the mass flow rate from the input connector
Boolean	use_h_in	false	Get the specific enthalpy from the input connector
Boolean	use_X_in	false	Get the composition from the input connector
Boolean	use_C_in	false	Get the trace substances from the input connector
MassFlowRate	m_flow	0	Fixed mass flow rate going out of the fluid port [kg/s]
SpecificEnthalpy	h	Medium.h_default	Fixed value of specific enthalpy [J/kg]
MassFraction	X[Medium.nX]	Medium.X_default	Fixed value of composition [kg/kg]
ExtraProperty	C[Medium.nC]	fill(0, Medium.nC)	Fixed values of trace substances

Connectors

Type Name Description

FluidPorts_b ports[nPorts]

input RealInput m_flow_in Prescribed mass flow rate

input RealInput h_in Prescribed fluid specific enthalpy

input RealInput X_in[Medium.nX] Prescribed fluid composition

input RealInput C_in[Medium.nC] Prescribed boundary trace substances

Type	Name	Description
FluidPorts_b	ports[nPorts]
input RealInput	m_flow_in	Prescribed mass flow rate
input RealInput	h_in	Prescribed fluid specific enthalpy
input RealInput	X_in[Medium.nX]	Prescribed fluid composition
input RealInput	C_in[Medium.nC]	Prescribed boundary trace substances

Modelica definition

model MassFlowSource_h 
  "Ideal flow source that produces a prescribed mass flow with prescribed specific enthalpy, mass fraction and trace substances"
  extends Sources.BaseClasses.PartialSource;
  parameter Boolean use_m_flow_in = false 
    "Get the mass flow rate from the input connector";
  parameter Boolean use_h_in= false 
    "Get the specific enthalpy from the input connector";
  parameter Boolean use_X_in = false 
    "Get the composition from the input connector";
  parameter Boolean use_C_in = false 
    "Get the trace substances from the input connector";
  parameter Medium.MassFlowRate m_flow = 0 
    "Fixed mass flow rate going out of the fluid port";
  parameter Medium.SpecificEnthalpy h = Medium.h_default 
    "Fixed value of specific enthalpy";
  parameter Medium.MassFraction X[Medium.nX] = Medium.X_default 
    "Fixed value of composition";
  parameter Medium.ExtraProperty C[Medium.nC](
       quantity=Medium.extraPropertiesNames)=fill(0, Medium.nC) 
    "Fixed values of trace substances";
  Modelica.Blocks.Interfaces.RealInput m_flow_in if     use_m_flow_in 
    "Prescribed mass flow rate";
  Modelica.Blocks.Interfaces.RealInput h_in if              use_h_in 
    "Prescribed fluid specific enthalpy";
  Modelica.Blocks.Interfaces.RealInput X_in[Medium.nX] if 
                                                        use_X_in 
    "Prescribed fluid composition";
  Modelica.Blocks.Interfaces.RealInput C_in[Medium.nC] if 
                                                        use_C_in 
    "Prescribed boundary trace substances";
protected 
  Modelica.Blocks.Interfaces.RealInput m_flow_in_internal 
    "Needed to connect to conditional connector";
  Modelica.Blocks.Interfaces.RealInput h_in_internal 
    "Needed to connect to conditional connector";
  Modelica.Blocks.Interfaces.RealInput X_in_internal[Medium.nX] 
    "Needed to connect to conditional connector";
  Modelica.Blocks.Interfaces.RealInput C_in_internal[Medium.nC] 
    "Needed to connect to conditional connector";
equation 
  Utilities.checkBoundary(Medium.mediumName, Medium.substanceNames,
    Medium.singleState, true, X_in_internal, "MassFlowSource_h");
  connect(m_flow_in, m_flow_in_internal);
  connect(h_in, h_in_internal);
  connect(X_in, X_in_internal);
  connect(C_in, C_in_internal);
  if not use_m_flow_in then
    m_flow_in_internal = m_flow;
  end if;
  if not use_h_in then
    h_in_internal = h;
  end if;
  if not use_X_in then
    X_in_internal = X;
  end if;
  if not use_C_in then
    C_in_internal = C;
  end if;
  sum(ports.m_flow) = -m_flow_in_internal;
  medium.h = h_in_internal;
  medium.Xi = X_in_internal[1:Medium.nXi];
  ports.C_outflow = fill(C_in_internal, nPorts);
end MassFlowSource_h;

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