Modelica.Fluid.Sources

Information

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

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)

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.

Parameters

Name	Description
replaceable package Medium	Medium model within the source
Boundary pressure or Boundary density
use_p	select p or d
p	Boundary pressure [Pa]
d	Boundary density [kg/m3]
Boundary temperature or Boundary specific enthalpy
use_T	select T or h
T	Boundary temperature [K]
h	Boundary specific enthalpy [J/kg]
Only for multi-substance flow
X[Medium.nX]	Boundary mass fractions m_i/m [kg/kg]
Only for trace-substance flow
C[Medium.nC]	Boundary trace substances

Connectors

Name	Description
ports[nPorts]

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.

Parameters

Name	Description
replaceable package Medium	Medium model within the source
use_p_in	Get the pressure from the input connector
use_T_in	Get the temperature from the input connector
use_X_in	Get the composition from the input connector
use_C_in	Get the trace substances from the input connector
p	Fixed value of pressure [Pa]
T	Fixed value of temperature [K]
X[Medium.nX]	Fixed value of composition [kg/kg]
C[Medium.nC]	Fixed values of trace substances

Connectors

Name	Description
ports[nPorts]
p_in	Prescribed boundary pressure
T_in	Prescribed boundary temperature
X_in[Medium.nX]	Prescribed boundary composition
C_in[Medium.nC]	Prescribed boundary 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).

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 specific enthalpy and composition

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.

Parameters

Name	Description
replaceable package Medium	Medium model within the source
use_p_in	Get the pressure from the input connector
use_h_in	Get the specific enthalpy from the input connector
use_X_in	Get the composition from the input connector
use_C_in	Get the trace substances from the input connector
p	Fixed value of pressure [Pa]
h	Fixed value of specific enthalpy [J/kg]
X[Medium.nX]	Fixed value of composition [kg/kg]
C[Medium.nC]	Fixed values of trace substances

Connectors

Name	Description
ports[nPorts]
p_in	Prescribed boundary pressure
h_in	Prescribed boundary specific enthalpy
X_in[Medium.nX]	Prescribed boundary composition
C_in[Medium.nC]	Prescribed boundary 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

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.

Parameters

Name	Description
replaceable package Medium	Medium model within the source
use_m_flow_in	Get the mass flow rate from the input connector
use_T_in	Get the temperature from the input connector
use_X_in	Get the composition from the input connector
use_C_in	Get the trace substances from the input connector
m_flow	Fixed mass flow rate going out of the fluid port [kg/s]
T	Fixed value of temperature [K]
X[Medium.nX]	Fixed value of composition [kg/kg]
C[Medium.nC]	Fixed values of trace substances

Connectors

Name	Description
ports[nPorts]
m_flow_in	Prescribed mass flow rate
T_in	Prescribed fluid temperature
X_in[Medium.nX]	Prescribed fluid composition
C_in[Medium.nC]	Prescribed boundary 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).

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

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.

Parameters

Name	Description
replaceable package Medium	Medium model within the source
use_m_flow_in	Get the mass flow rate from the input connector
use_h_in	Get the specific enthalpy from the input connector
use_X_in	Get the composition from the input connector
use_C_in	Get the trace substances from the input connector
m_flow	Fixed mass flow rate going out of the fluid port [kg/s]
h	Fixed value of specific enthalpy [J/kg]
X[Medium.nX]	Fixed value of composition [kg/kg]
C[Medium.nC]	Fixed values of trace substances

Connectors

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