Modelica.Media.Examples.Tests.Components

Functions, connectors and models needed for the media model tests

Information



Extends from Modelica.Icons.Library (Icon for library).

Package Content

NameDescription
Modelica.Media.Examples.Tests.Components.FluidPort FluidPort Interface for quasi one-dimensional fluid flow in a piping network (incompressible or compressible, one or more phases, one or more substances)
Modelica.Media.Examples.Tests.Components.FluidPort_a FluidPort_a Fluid connector with filled icon
Modelica.Media.Examples.Tests.Components.FluidPort_b FluidPort_b Fluid connector with outlined icon
Modelica.Media.Examples.Tests.Components.PortVolume PortVolume Fixed volume associated with a port by the finite volume method
Modelica.Media.Examples.Tests.Components.FixedMassFlowRate FixedMassFlowRate Ideal pump that produces a constant mass flow rate from a large reservoir at fixed temperature and mass fraction
Modelica.Media.Examples.Tests.Components.FixedAmbient FixedAmbient Ambient pressure, temperature and mass fraction source
Modelica.Media.Examples.Tests.Components.ShortPipe ShortPipe Simple pressure loss in pipe
Modelica.Media.Examples.Tests.Components.PartialTestModel PartialTestModel Basic test model to test a medium
Modelica.Media.Examples.Tests.Components.PartialTestModel2 PartialTestModel2 slightly larger test model to test a medium


Modelica.Media.Examples.Tests.Components.FluidPort

Interface for quasi one-dimensional fluid flow in a piping network (incompressible or compressible, one or more phases, one or more substances)

Information



Contents

TypeNameDescription
AbsolutePressurepPressure in the connection point [Pa]
flow MassFlowRatem_flowMass flow rate from the connection point into the component [kg/s]
SpecificEnthalpyhSpecific mixture enthalpy in the connection point [J/kg]
flow EnthalpyFlowRateH_flowEnthalpy flow rate into the component (if m_flow > 0, H_flow = m_flow*h) [W]
MassFractionXi[Medium.nXi]Independent mixture mass fractions m_i/m in the connection point [kg/kg]
flow MassFlowRatemXi_flow[Medium.nXi]Mass flow rates of the independent substances from the connection point into the component (if m_flow > 0, mX_flow = m_flow*X) [kg/s]
ExtraPropertyC[Medium.nC]properties c_i/m in the connection point
flow ExtraPropertyFlowRatemC_flow[Medium.nC]Flow rates of auxiliary properties from the connection point into the component (if m_flow > 0, mC_flow = m_flow*C) [kg/s]

Modelica definition

connector FluidPort 
  "Interface for quasi one-dimensional fluid flow in a piping network (incompressible or compressible, one or more phases, one or more substances)"

  replaceable package Medium = Modelica.Media.Interfaces.PartialMedium 
    "Medium model";

  Medium.AbsolutePressure p "Pressure in the connection point";
  flow Medium.MassFlowRate m_flow 
    "Mass flow rate from the connection point into the component";

  Medium.SpecificEnthalpy h "Specific mixture enthalpy in the connection point";
  flow Medium.EnthalpyFlowRate H_flow 
    "Enthalpy flow rate into the component (if m_flow > 0, H_flow = m_flow*h)";

  Medium.MassFraction Xi[Medium.nXi] 
    "Independent mixture mass fractions m_i/m in the connection point";
  flow Medium.MassFlowRate mXi_flow[Medium.nXi] 
    "Mass flow rates of the independent substances from the connection point into the component (if m_flow > 0, mX_flow = m_flow*X)";

  Medium.ExtraProperty C[Medium.nC] "properties c_i/m in the connection point";
  flow Medium.ExtraPropertyFlowRate mC_flow[Medium.nC] 
    "Flow rates of auxiliary properties from the connection point into the component (if m_flow > 0, mC_flow = m_flow*C)";

end FluidPort;

Modelica.Media.Examples.Tests.Components.FluidPort_a Modelica.Media.Examples.Tests.Components.FluidPort_a

Fluid connector with filled icon

Modelica.Media.Examples.Tests.Components.FluidPort_a

Information

Modelica.Media.Examples.Tests.Components.FluidPort_a

Extends from FluidPort (Interface for quasi one-dimensional fluid flow in a piping network (incompressible or compressible, one or more phases, one or more substances)).

Parameters

TypeNameDefaultDescription
replaceable package MediumPartialMediumMedium model

Contents

TypeNameDescription
AbsolutePressurepPressure in the connection point [Pa]
flow MassFlowRatem_flowMass flow rate from the connection point into the component [kg/s]
SpecificEnthalpyhSpecific mixture enthalpy in the connection point [J/kg]
flow EnthalpyFlowRateH_flowEnthalpy flow rate into the component (if m_flow > 0, H_flow = m_flow*h) [W]
MassFractionXi[Medium.nXi]Independent mixture mass fractions m_i/m in the connection point [kg/kg]
flow MassFlowRatemXi_flow[Medium.nXi]Mass flow rates of the independent substances from the connection point into the component (if m_flow > 0, mX_flow = m_flow*X) [kg/s]
ExtraPropertyC[Medium.nC]properties c_i/m in the connection point
flow ExtraPropertyFlowRatemC_flow[Medium.nC]Flow rates of auxiliary properties from the connection point into the component (if m_flow > 0, mC_flow = m_flow*C) [kg/s]

Modelica definition

connector FluidPort_a "Fluid connector with filled icon"
  extends FluidPort;
end FluidPort_a;

Modelica.Media.Examples.Tests.Components.FluidPort_b Modelica.Media.Examples.Tests.Components.FluidPort_b

Fluid connector with outlined icon

Modelica.Media.Examples.Tests.Components.FluidPort_b

Information



Extends from FluidPort (Interface for quasi one-dimensional fluid flow in a piping network (incompressible or compressible, one or more phases, one or more substances)).

Parameters

TypeNameDefaultDescription
replaceable package MediumPartialMediumMedium model

Contents

TypeNameDescription
AbsolutePressurepPressure in the connection point [Pa]
flow MassFlowRatem_flowMass flow rate from the connection point into the component [kg/s]
SpecificEnthalpyhSpecific mixture enthalpy in the connection point [J/kg]
flow EnthalpyFlowRateH_flowEnthalpy flow rate into the component (if m_flow > 0, H_flow = m_flow*h) [W]
MassFractionXi[Medium.nXi]Independent mixture mass fractions m_i/m in the connection point [kg/kg]
flow MassFlowRatemXi_flow[Medium.nXi]Mass flow rates of the independent substances from the connection point into the component (if m_flow > 0, mX_flow = m_flow*X) [kg/s]
ExtraPropertyC[Medium.nC]properties c_i/m in the connection point
flow ExtraPropertyFlowRatemC_flow[Medium.nC]Flow rates of auxiliary properties from the connection point into the component (if m_flow > 0, mC_flow = m_flow*C) [kg/s]

Modelica definition

connector FluidPort_b "Fluid connector with outlined icon"
  extends FluidPort;
end FluidPort_b;

Modelica.Media.Examples.Tests.Components.PortVolume Modelica.Media.Examples.Tests.Components.PortVolume

Fixed volume associated with a port by the finite volume method

Modelica.Media.Examples.Tests.Components.PortVolume

Information


This component models the volume of fixed size that is associated with the fluid port to which it is connected. This means that all medium properties inside the volume, are identical to the port medium properties. In particular, the specific enthalpy inside the volume (= medium.h) is always identical to the specific enthalpy in the port (port.h = medium.h). Usually, this model is used when discretizing a component according to the finite volume method into volumes in internal ports that only store energy and mass and into transport elements that just transport energy, mass and momentum between the internal ports without storing these quantities during the transport.

Parameters

TypeNameDefaultDescription
VolumeV1e-6Fixed size of junction volume [m3]
Initial pressure or initial density
Booleanuse_p_starttrueselect p_start or d_start
AbsolutePressurep_start101325Initial pressure [Pa]
Densityd_start1Initial density [kg/m3]
Initial temperature or initial specific enthalpy
Booleanuse_T_starttrueselect T_start or h_start
TemperatureT_startModelica.SIunits.Conversions...Initial temperature [K]
SpecificEnthalpyh_start1.e4Initial specific enthalpy [J/kg]
Only for multi-substance flow
MassFractionX_start[Medium.nX] Initial mass fractions m_i/m [kg/kg]

Connectors

TypeNameDescription
FluidPort_aport 

Modelica definition

model PortVolume 
  "Fixed volume associated with a port by the finite volume method"
  import SI = Modelica.SIunits;

  replaceable package Medium = Modelica.Media.Interfaces.PartialMedium 
    "Medium model";

  parameter SI.Volume V=1e-6 "Fixed size of junction volume";

  parameter Boolean use_p_start=true "select p_start or d_start";
  parameter Medium.AbsolutePressure p_start = 101325 "Initial pressure";
  parameter Medium.Density d_start=1 "Initial density";
  parameter Boolean use_T_start=true "select T_start or h_start";
  parameter Medium.Temperature T_start = Modelica.SIunits.Conversions.from_degC(20) 
    "Initial temperature";
  parameter Medium.SpecificEnthalpy h_start = 1.e4 "Initial specific enthalpy";
  parameter Medium.MassFraction X_start[Medium.nX] 
    "Initial mass fractions m_i/m";

  FluidPort_a port(redeclare package Medium = Medium);
  Medium.BaseProperties medium(preferredMediumStates=true);
  SI.Energy U "Internal energy of port volume";
  SI.Mass m "Mass of junction volume";
  SI.Mass mXi[Medium.nXi] "Independent substance masses of junction volume";

initial equation 
  if not Medium.singleState then
    if use_p_start then
       medium.p = p_start;
    else
       medium.d = d_start;
    end if;
  end if;

  if use_T_start then
     medium.T = T_start;
  else
     medium.h = h_start;
  end if;

  medium.Xi = X_start[1:Medium.nXi];
equation 
  // Connect port to medium variables
     medium.p = port.p;
     medium.h = port.h;
     medium.Xi = port.Xi;

  // Total quantities
     m    = V*medium.d;
     mXi = m*medium.Xi;
     U    = m*medium.u;

  // Mass and energy balance
     der(m)    = port.m_flow;
     der(mXi) = port.mXi_flow;
     der(U)    = port.H_flow;
end PortVolume;

Modelica.Media.Examples.Tests.Components.FixedMassFlowRate Modelica.Media.Examples.Tests.Components.FixedMassFlowRate

Ideal pump that produces a constant mass flow rate from a large reservoir at fixed temperature and mass fraction

Modelica.Media.Examples.Tests.Components.FixedMassFlowRate

Information



Parameters

TypeNameDefaultDescription
MassFlowRatem_flow Fixed mass flow rate from an infinite reservoir to the fluid port [kg/s]
MassFractionX_ambient[Medium.nX] Ambient mass fractions m_i/m of reservoir [kg/kg]
Ambient temperature or ambient specific enthalpy
Booleanuse_T_ambienttrueselect T_ambient or h_ambient
TemperatureT_ambientModelica.SIunits.Conversions...Ambient temperature [K]
SpecificEnthalpyh_ambient1.e4Ambient specific enthalpy [J/kg]

Connectors

TypeNameDescription
FluidPort_bport 

Modelica definition

model FixedMassFlowRate 
  "Ideal pump that produces a constant mass flow rate from a large reservoir at fixed temperature and mass fraction"

  parameter Medium.MassFlowRate m_flow 
    "Fixed mass flow rate from an infinite reservoir to the fluid port";

  parameter Boolean use_T_ambient=true "select T_ambient or h_ambient";
  parameter Medium.Temperature T_ambient=
      Modelica.SIunits.Conversions.from_degC(20) "Ambient temperature";
  parameter Medium.SpecificEnthalpy h_ambient=
      1.e4 "Ambient specific enthalpy";
  parameter Medium.MassFraction X_ambient[Medium.nX] 
    "Ambient mass fractions m_i/m of reservoir";

  replaceable package Medium = Modelica.Media.Interfaces.PartialMedium 
    "Medium model";

  Medium.BaseProperties medium "Medium in the source";
  FluidPort_b port(redeclare package Medium = Medium);
equation 
   if use_T_ambient then
     medium.T = T_ambient;
   else
     medium.h = h_ambient;
   end if;

   medium.Xi     = X_ambient[1:Medium.nXi];
   medium.p      = port.p;
   port.m_flow   = -m_flow;
   port.mXi_flow = semiLinear(port.m_flow, port.Xi, medium.Xi);
   port.H_flow   = semiLinear(port.m_flow, port.h, medium.h);
end FixedMassFlowRate;

Modelica.Media.Examples.Tests.Components.FixedAmbient Modelica.Media.Examples.Tests.Components.FixedAmbient

Ambient pressure, temperature and mass fraction source

Modelica.Media.Examples.Tests.Components.FixedAmbient

Information


Model FixedAmbient_pt defines constant values for ambient conditions:

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

Parameters

TypeNameDefaultDescription
Ambient pressure or ambient density
Booleanuse_p_ambienttrueselect p_ambient or d_ambient
AbsolutePressurep_ambient101325Ambient pressure [Pa]
Densityd_ambient1Ambient density [kg/m3]
Ambient temperature or ambient specific enthalpy
Booleanuse_T_ambienttrueselect T_ambient or h_ambient
TemperatureT_ambientModelica.SIunits.Conversions...Ambient temperature [K]
SpecificEnthalpyh_ambient1.e4Ambient specific enthalpy [J/kg]
Only for multi-substance flow
MassFractionX_ambient[Medium.nX] Ambient mass fractions m_i/m [kg/kg]

Connectors

TypeNameDescription
FluidPort_bport 

Modelica definition

model FixedAmbient 
  "Ambient pressure, temperature and mass fraction source"
  replaceable package Medium = Modelica.Media.Interfaces.PartialMedium 
    "Medium model";

  parameter Boolean use_p_ambient=true "select p_ambient or d_ambient";
  parameter Medium.AbsolutePressure p_ambient= 101325 "Ambient pressure";
  parameter Medium.Density d_ambient=1 "Ambient density";
  parameter Boolean use_T_ambient=true "select T_ambient or h_ambient";
  parameter Medium.Temperature T_ambient=
      Modelica.SIunits.Conversions.from_degC(20) "Ambient temperature";
  parameter Medium.SpecificEnthalpy h_ambient=
      1.e4 "Ambient specific enthalpy";
  parameter Medium.MassFraction X_ambient[Medium.nX] 
    "Ambient mass fractions m_i/m";

  Medium.BaseProperties medium "Medium in the source";
  FluidPort_b port(redeclare package Medium = Medium);

equation 
  if use_p_ambient or Medium.singleState then
    medium.p = p_ambient;
  else
    medium.d = d_ambient;
  end if;

  if use_T_ambient then
    medium.T = T_ambient;
  else
    medium.h = h_ambient;
  end if;

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

  port.p = medium.p;
  port.H_flow   = semiLinear(port.m_flow, port.h, medium.h);
  port.mXi_flow = semiLinear(port.m_flow, port.Xi, medium.Xi);
end FixedAmbient;

Modelica.Media.Examples.Tests.Components.ShortPipe Modelica.Media.Examples.Tests.Components.ShortPipe

Simple pressure loss in pipe

Modelica.Media.Examples.Tests.Components.ShortPipe

Information


Model ShortPipe defines a simple pipe model with pressure loss due to friction. It is assumed that no mass or energy is stored in the pipe.

Parameters

TypeNameDefaultDescription
AbsolutePressuredp_nominal Nominal pressure drop [Pa]
MassFlowRatem_flow_nominal Nominal mass flow rate at nominal pressure drop [kg/s]

Connectors

TypeNameDescription
FluidPort_aport_a 
FluidPort_bport_b 

Modelica definition

model ShortPipe "Simple pressure loss in pipe"
   replaceable package Medium = Modelica.Media.Interfaces.PartialMedium 
    "Medium model";

  parameter Medium.AbsolutePressure dp_nominal(min=1.e-10) 
    "Nominal pressure drop";
  parameter Medium.MassFlowRate m_flow_nominal(min=1.e-10) 
    "Nominal mass flow rate at nominal pressure drop";

  FluidPort_a port_a(redeclare package Medium = Medium);
  FluidPort_b port_b(redeclare package Medium = Medium);
  // Medium.BaseProperties medium_a(p=port_a.p, h=port_a.h, Xi=port_a.Xi)
  //   "Medium properties in port_a";
  // Medium.BaseProperties medium_b(p=port_b.p, h=port_b.h, Xi=port_b.Xi)
  //   "Medium properties in port_b";
  Medium.MassFlowRate m_flow 
    "Mass flow rate from port_a to port_b (m_flow > 0 is design flow direction)";
  Modelica.SIunits.Pressure dp "Pressure drop from port_a to port_b";
equation 
  /* Handle reverse and zero flow */
  port_a.H_flow   = semiLinear(port_a.m_flow, port_a.h,   port_b.h);
  port_a.mXi_flow = semiLinear(port_a.m_flow, port_a.Xi, port_b.Xi);

  /* Energy, mass and substance mass balance */
  port_a.H_flow + port_b.H_flow = 0;
  port_a.m_flow + port_b.m_flow = 0;
  port_a.mXi_flow + port_b.mXi_flow = zeros(Medium.nXi);

  // Design direction of mass flow rate
  m_flow = port_a.m_flow;

  // Pressure drop
  dp = port_a.p - port_b.p;
  m_flow = (m_flow_nominal/dp_nominal)*dp;
end ShortPipe;

Modelica.Media.Examples.Tests.Components.PartialTestModel Modelica.Media.Examples.Tests.Components.PartialTestModel

Basic test model to test a medium

Modelica.Media.Examples.Tests.Components.PartialTestModel

Information



Extends from Modelica.Icons.Example (Icon for an example model).

Parameters

TypeNameDefaultDescription
AbsolutePressurep_startMedium.p_defaultInitial value of pressure [Pa]
TemperatureT_startMedium.T_defaultInitial value of temperature [K]
SpecificEnthalpyh_startMedium.h_defaultInitial value of specific enthalpy [J/kg]
RealX_start[Medium.nX]Medium.X_defaultInitial value of mass fractions

Modelica definition

partial model PartialTestModel "Basic test model to test a medium"
  import SI = Modelica.SIunits;
  extends Modelica.Icons.Example;

  replaceable package Medium = Modelica.Media.Interfaces.PartialMedium 
    "Medium model";
  parameter SI.AbsolutePressure p_start = Medium.p_default 
    "Initial value of pressure";
  parameter SI.Temperature T_start = Medium.T_default 
    "Initial value of temperature";
  parameter SI.SpecificEnthalpy h_start = Medium.h_default 
    "Initial value of specific enthalpy";
  parameter Real X_start[Medium.nX] = Medium.X_default 
    "Initial value of mass fractions";

/*
  parameter SI.AbsolutePressure p_start = 1.0e5 "Initial value of pressure";
  parameter SI.Temperature T_start = 300 "Initial value of temperature";
  parameter SI.Density h_start = 1 "Initial value of specific enthalpy";
  parameter Real X_start[Medium.nX] = Medium.reference_X
    "Initial value of mass fractions";
*/
  PortVolume volume(redeclare package Medium = Medium,
                    p_start=p_start,
                    T_start=T_start,
                    h_start=h_start,
                    X_start = X_start,
                    V=0.1);
  FixedMassFlowRate fixedMassFlowRate(redeclare package Medium = Medium,
    T_ambient=1.2*T_start,
    h_ambient=1.2*h_start,
    m_flow=1,
    X_ambient=0.5*X_start);
  FixedAmbient ambient(
    redeclare package Medium = Medium,
    T_ambient=T_start,
    h_ambient=h_start,
    X_ambient=X_start,
    p_ambient=p_start);
  ShortPipe shortPipe(redeclare package Medium = Medium,
    m_flow_nominal=1,
    dp_nominal=0.1e5);
equation 
  connect(fixedMassFlowRate.port, volume.port);
  connect(volume.port, shortPipe.port_a);
  connect(shortPipe.port_b, ambient.port);
end PartialTestModel;

Modelica.Media.Examples.Tests.Components.PartialTestModel2 Modelica.Media.Examples.Tests.Components.PartialTestModel2

slightly larger test model to test a medium

Modelica.Media.Examples.Tests.Components.PartialTestModel2

Information



Extends from Modelica.Icons.Example (Icon for an example model).

Parameters

TypeNameDefaultDescription
AbsolutePressurep_start1.0e5Initial value of pressure [Pa]
TemperatureT_start300Initial value of temperature [K]
SpecificEnthalpyh_start1Initial value of specific enthalpy [J/kg]
RealX_start[Medium.nX]Medium.reference_XInitial value of mass fractions

Modelica definition

partial model PartialTestModel2 
  "slightly larger test model to test a medium"
  import SI = Modelica.SIunits;
  extends Modelica.Icons.Example;

  replaceable package Medium = Modelica.Media.Interfaces.PartialMedium 
    "Medium model";
  parameter SI.AbsolutePressure p_start = 1.0e5 "Initial value of pressure";
  parameter SI.Temperature T_start = 300 "Initial value of temperature";
  parameter SI.SpecificEnthalpy h_start = 1 
    "Initial value of specific enthalpy";
  parameter Real X_start[Medium.nX] = Medium.reference_X 
    "Initial value of mass fractions";
  PortVolume volume(redeclare package Medium = Medium,
                    p_start=p_start,
                    T_start=T_start,
                    h_start=h_start,
                    X_start = X_start,
                    V=0.1);
  FixedMassFlowRate fixedMassFlowRate(redeclare package Medium = Medium,
    T_ambient=1.2*T_start,
    h_ambient=1.2*h_start,
    m_flow=1,
    X_ambient=0.5*X_start);
  FixedAmbient ambient(
    redeclare package Medium = Medium,
    T_ambient=T_start,
    h_ambient=h_start,
    X_ambient=X_start,
    p_ambient=p_start);
  ShortPipe shortPipe(redeclare package Medium = Medium,
    m_flow_nominal=1,
    dp_nominal=0.1e5);
  PortVolume volume1(
                    redeclare package Medium = Medium,
                    p_start=p_start,
                    T_start=T_start,
                    h_start=h_start,
                    X_start = X_start,
                    V=0.1);
  ShortPipe shortPipe1(
                      redeclare package Medium = Medium,
    m_flow_nominal=1,
    dp_nominal=0.1e5);
equation 
  connect(fixedMassFlowRate.port, volume.port);
  connect(volume.port, shortPipe.port_a);
  connect(volume1.port, shortPipe1.port_a);
  connect(shortPipe.port_b, volume1.port);
  connect(shortPipe1.port_b, ambient.port);
end PartialTestModel2;

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