Buildings.Fluid.Sources.Examples

Information

This package contains examples for the use of models that can be found in Buildings.Fluid.Sources.

Extends from Modelica.Icons.ExamplesPackage (Icon for packages containing runnable examples).

Package Content

Name	Description
PrescribedExtraPropertyFlow
Outside	Test model for source and sink with outside weather data
Outside_Cp	Test model for source and sink with outside weather data and wind pressure
Outside_CpLowRise	Test model for source and sink with outside weather data and wind pressure

Buildings.Fluid.Sources.Examples.PrescribedExtraPropertyFlow

Information

Extends from Modelica.Icons.Example (Icon for runnable examples).

Modelica definition

model PrescribedExtraPropertyFlow
  extends Modelica.Icons.Example;
  package Medium = Buildings.Media.GasesPTDecoupled.SimpleAir(extraPropertiesNames={"CO2"});
 // package Medium = Buildings.Media.GasesPTDecoupled.SimpleAir;

  MixingVolumes.MixingVolume vol(
    redeclare package Medium = Medium,
    V=100,
    m_flow_nominal=1,
    nPorts=2,
    energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial) "Mixing volume";
  PrescribedExtraPropertyFlowRate sou(redeclare package Medium = Medium,
      use_m_flow_in=true,
    nPorts=1);
  Modelica.Blocks.Sources.Step step(          startTime=0.5,
    height=-2,
    offset=2);
  FixedResistances.FixedResistanceDpM res(
    redeclare package Medium = Medium,
    m_flow_nominal=1,
    dp_nominal=1) 
    "Resistance, used to check if species are transported between ports";
  MixingVolumes.MixingVolume vol1(
    redeclare package Medium = Medium,
    V=100,
    m_flow_nominal=1,
    nPorts=2,
    energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial) "Mixing volume";
  PrescribedExtraPropertyFlowRate sou1(
                                      redeclare package Medium = Medium,
      use_m_flow_in=true);
  Buildings.Utilities.Diagnostics.AssertEquality assEqu(threShold=1E-4) 
    "Assert that both volumes have the same concentration";
  MixingVolumes.MixingVolume vol2(
    redeclare package Medium = Medium,
    p_start=Medium.p_default,
    V=100,
    m_flow_nominal=1,
    nPorts=3,
    energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial) "Mixing volume";
  MixingVolumes.MixingVolume vol3(
    redeclare package Medium = Medium,
    p_start=Medium.p_default,
    V=100,
    m_flow_nominal=1,
    nPorts=3,
    energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial) "Mixing volume";
  Buildings.Fluid.FixedResistances.SplitterFixedResistanceDpM spl(
    redeclare package Medium = Medium,
    m_flow_nominal={1,1,1},
    dp_nominal={1,1,1},
    from_dp=false,
    energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
    massDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial);
  Buildings.Utilities.Diagnostics.AssertEquality assEqu1(
                                                     threShold=1E-4) 
    "Assert that both volumes have the same concentration";
  MixingVolumes.MixingVolume vol4(
    redeclare package Medium = Medium,
    nPorts=3,
    p_start=Medium.p_default,
    V=100,
    m_flow_nominal=1,
    energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial) "Mixing volume";
  PrescribedExtraPropertyFlowRate sou2(
                                      redeclare package Medium = Medium,
      use_m_flow_in=true);
  Buildings.Fluid.Sources.Boundary_pT bou(
    redeclare package Medium = Medium,
    p=101325,
    nPorts=1,
    T=293.15);
  Buildings.Fluid.Sources.Boundary_pT sin(
    redeclare package Medium = Medium,
    nPorts=2,
    p=101320,
    T=293.15) "Sink boundary conditions";
  FixedResistances.FixedResistanceDpM res1(
    redeclare package Medium = Medium,
    m_flow_nominal=1,
    dp_nominal=1) 
    "Resistance, used to check if species are transported between ports";
  FixedResistances.FixedResistanceDpM res2(
    redeclare package Medium = Medium,
    m_flow_nominal=1,
    dp_nominal=1) 
    "Resistance, used to check if species are transported between ports";
  FixedResistances.FixedResistanceDpM res3(
    redeclare package Medium = Medium,
    m_flow_nominal=1,
    dp_nominal=1) 
    "Resistance, used to check if species are transported between ports";
  inner Modelica.Fluid.System system(energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial);
  Sensors.TraceSubstances C(redeclare package Medium = Medium) 
    "Trace substance sensor";
  Sensors.TraceSubstances C1(redeclare package Medium = Medium) 
    "Trace substance sensor";
  Sensors.TraceSubstances C2(redeclare package Medium = Medium) 
    "Trace substance sensor";
  Sensors.TraceSubstances C3(redeclare package Medium = Medium) 
    "Trace substance sensor";
equation 
  connect(vol4.ports[2], spl.port_3);
  connect(res3.port_b, vol4.ports[3]);
  connect(res1.port_b, sin.ports[1]);
  connect(res2.port_b, sin.ports[2]);
  connect(bou.ports[1], res3.port_a);
  connect(sou1.ports[1], res.port_a);
  connect(sou2.ports[1], vol4.ports[1]);
  connect(step.y, sou.m_flow_in);
  connect(step.y, sou1.m_flow_in);
  connect(step.y, sou2.m_flow_in);
  connect(assEqu.u1, C.C);
  connect(C1.C, assEqu.u2);
  connect(assEqu1.u1, C2.C);
  connect(C3.C, assEqu1.u2);
  connect(sou.ports[1], vol.ports[1]);
  connect(vol.ports[2], C.port);
  connect(res.port_b, vol1.ports[1]);
  connect(vol1.ports[2], C1.port);
  connect(spl.port_1, vol2.ports[1]);
  connect(vol2.ports[2], res1.port_a);
  connect(spl.port_2, vol3.ports[1]);
  connect(vol3.ports[2], res2.port_a);
  connect(C2.port, vol2.ports[3]);
  connect(C3.port, vol3.ports[3]);
end PrescribedExtraPropertyFlow;

Buildings.Fluid.Sources.Examples.Outside

Information

Modelica definition

model Outside 
  "Test model for source and sink with outside weather data"
  extends Modelica.Icons.Example;
  package Medium = Buildings.Media.GasesConstantDensity.MoistAirUnsaturated 
    "Medium model for air";
  Buildings.Fluid.Sources.Outside bou(redeclare package Medium = Medium, nPorts=
       1) "Model with outside conditions";
  Buildings.BoundaryConditions.WeatherData.ReaderTMY3 weaDat(filNam=
        "Resources/weatherdata/USA_IL_Chicago-OHare.Intl.AP.725300_TMY3.mos");
  MassFlowSource_T sin(redeclare package Medium = Medium, m_flow=-1,
    nPorts=1) "Sink";
  Sensors.TemperatureTwoPort senTem(redeclare package Medium = Medium,
      m_flow_nominal=1) "Temperature sensor";
  Sensors.RelativeHumidityTwoPort senRelHum(redeclare package Medium = Medium,
      m_flow_nominal=1);
  Sensors.MassFractionTwoPort senMasFra(redeclare package Medium = Medium,
      m_flow_nominal=1) "Sensor for mass fraction of water";
  inner Modelica.Fluid.System system(energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial);
equation 
  connect(weaDat.weaBus, bou.weaBus);
  connect(senTem.port_b, sin.ports[1]);
  connect(senRelHum.port_a, bou.ports[1]);
  connect(senRelHum.port_b, senMasFra.port_a);
  connect(senMasFra.port_b, senTem.port_a);
end Outside;

Buildings.Fluid.Sources.Examples.Outside_Cp

Information

This model demonstrates the use of a source for ambient temperature, pressure and species concentration. The models bou1 and bou2 compute the ambient pressure based on the weather file and the wind pressure. The model bou1 uses a parameter for the wind pressure coefficient, whereas bou2 uses the wind pressure coefficient from its input port. The model bouFix does not compute any wind pressure. Adding the wind pressure to the models on the left-hand side induces a mass flow rate through the orifice models ori1 and ori2. Since both source models use the same constant wind pressure coefficient, the mass flow rate through the orifice model is the same. In more realistic applications, the constant source Cp would be replaced by a model that computes a wind pressure coefficient that takes into account the wind direction relative to the building.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Modelica definition

model Outside_Cp 
  "Test model for source and sink with outside weather data and wind pressure"
  import Buildings;
  extends Modelica.Icons.Example;
  package Medium = Buildings.Media.GasesConstantDensity.MoistAirUnsaturated 
    "Medium model for air";
  Buildings.Fluid.Sources.Outside_Cp bou1(
    redeclare package Medium = Medium,
    nPorts=1,
    Cp=0.6) "Model with outside conditions";
  Buildings.BoundaryConditions.WeatherData.ReaderTMY3 weaDat(
    filNam="Resources/weatherdata/USA_CA_San.Francisco.Intl.AP.724940_TMY3.mos");
  inner Modelica.Fluid.System system(energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial);
  Buildings.Fluid.Sources.Outside bouFix(redeclare package Medium = Medium,
      nPorts=2) "Model with outside conditions";
  Modelica.Blocks.Sources.Constant Cp(k=0.6) 
    "Constant value for Cp (used to demonstrate input connector)";
  Buildings.Airflow.Multizone.Orifice ori1(A=0.1, redeclare package Medium =
        Medium) "Orifice";
  Buildings.Fluid.Sources.Outside_Cp bou2(
    redeclare package Medium = Medium,
    nPorts=1,
    use_Cp_in=true) "Model with outside conditions";
  Buildings.Airflow.Multizone.Orifice ori2(A=0.1, redeclare package Medium =
        Medium) "Orifice";
equation 
  connect(weaDat.weaBus, bou1.weaBus);
  connect(bou1.ports[1], ori1.port_a);
  connect(ori1.port_b, bouFix.ports[1]);
  connect(weaDat.weaBus, bouFix.weaBus);
  connect(bou2.Cp_in, Cp.y);
  connect(bou2.ports[1], ori2.port_a);
  connect(ori2.port_b, bouFix.ports[2]);
  connect(weaDat.weaBus, bou2.weaBus);
end Outside_Cp;

Buildings.Fluid.Sources.Examples.Outside_CpLowRise

Information

This model demonstrates the use of a source for ambient conditions that computes the wind pressure on a facade of a low-rise building. Weather data are used for San Francisco, for a period of a week where the wind blows primarily from North-West. The plot shows that the wind pressure on the north- and west-facing facade is positive, whereas it is negative for the south- and east-facing facades.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Modelica definition

model Outside_CpLowRise 
  "Test model for source and sink with outside weather data and wind pressure"
  import Buildings;
  extends Modelica.Icons.Example;
  package Medium = Buildings.Media.GasesConstantDensity.MoistAirUnsaturated 
    "Medium model for air";
  Buildings.Fluid.Sources.Outside_CpLowRise west(
    redeclare package Medium = Medium,
    s=5,
    azi=Buildings.HeatTransfer.Types.Azimuth.W,
    Cp0=0.6) "Model with outside conditions";
  Buildings.BoundaryConditions.WeatherData.ReaderTMY3 weaDat(
    filNam="Resources/weatherdata/USA_CA_San.Francisco.Intl.AP.724940_TMY3.mos");
  inner Modelica.Fluid.System system(energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial);
  Buildings.Fluid.Sources.Outside_CpLowRise north(
    redeclare package Medium = Medium,
    s=1/5,
    azi=Buildings.HeatTransfer.Types.Azimuth.N,
    Cp0=0.6) "Model with outside conditions";
  Buildings.Fluid.Sources.Outside_CpLowRise south(
    redeclare package Medium = Medium,
    s=1/5,
    azi=Buildings.HeatTransfer.Types.Azimuth.S,
    Cp0=0.6) "Model with outside conditions";
  Buildings.Fluid.Sources.Outside_CpLowRise east(
    redeclare package Medium = Medium,
    s=5,
    azi=Buildings.HeatTransfer.Types.Azimuth.E,
    Cp0=0.6) "Model with outside conditions";
equation 
  connect(weaDat.weaBus, west.weaBus);
  connect(weaDat.weaBus, north.weaBus);
  connect(weaDat.weaBus, south.weaBus);
  connect(weaDat.weaBus, east.weaBus);
end Outside_CpLowRise;