Buildings.Fluid.Storage.Examples

Collection of models that illustrate model use and test models

Information

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

Extends from Buildings.BaseClasses.BaseIconExamples (Icon for Examples packages).

Package Content

Name Description

ExpansionVessel Test model for expansion vessel

Stratified Test model for stratified tank

StratifiedLoadingUnloading Test model for stratified tank

Name	Description
ExpansionVessel	Test model for expansion vessel
Stratified	Test model for stratified tank
StratifiedLoadingUnloading	Test model for stratified tank

Buildings.Fluid.Storage.Examples.ExpansionVessel

Test model for expansion vessel

Buildings.Fluid.Storage.Examples.ExpansionVessel

Information

This model tests a pressure expansion vessel. The medium model that is used in this example changes its density as a function of temperature. To see the effect of the expansion vessel, delete the connecting line between the volume and the expansion vessel and check how much more the pressure increases as the fluid is heated.

Modelica definition

model ExpansionVessel "Test model for expansion vessel"
  import Buildings;

 package Medium = Modelica.Media.Water.WaterIF97OnePhase_ph "Medium model";
// package Medium = Buildings.Media.ConstantPropertyLiquidWaterCompressible "Medium model";

  inner Modelica.Fluid.System system(p_ambient=400000, massDynamics=Modelica.Fluid.Types.Dynamics.DynamicFreeInitial);
  Buildings.Fluid.Storage.ExpansionVessel expVes(
    redeclare package Medium = Medium, VTot=0.1) "Expansion vessel";
  Buildings.Fluid.MixingVolumes.MixingVolume vol(
    redeclare package Medium = Medium,
    use_HeatTransfer=true,
    V=1,
    nPorts=1) "Volume of water";
  Modelica.Blocks.Sources.Pulse pulse(
    amplitude=20,
    period=3600,
    offset=293.15);
  Modelica.Thermal.HeatTransfer.Sources.PrescribedTemperature preTem;
  Modelica.Thermal.HeatTransfer.Components.ThermalConductor theCon(G=10000);
equation 
  connect(pulse.y, preTem.T);
  connect(preTem.port, theCon.port_a);
  connect(theCon.port_b, vol.heatPort);
  connect(vol.ports[1], expVes.port_a);
end ExpansionVessel;

Buildings.Fluid.Storage.Examples.Stratified

Test model for stratified tank

Buildings.Fluid.Storage.Examples.Stratified

Information

This test model compares two tank models. The only difference between the two tank models is that one uses the third order upwind discretization scheme that reduces numerical diffusion that is induced when connecting volumes in series.

Modelica definition

model Stratified "Test model for stratified tank"

 package Medium = Buildings.Media.ConstantPropertyLiquidWater "Medium model";

  Buildings.Fluid.Storage.Stratified tanSim(
    redeclare package Medium = Medium,
    hTan=3,
    dIns=0.3,
    VTan=5,
    m_flow_nominal=10,
    nSeg=10) "Tank";
    Modelica.Blocks.Sources.TimeTable TWat(table=[0,273.15 + 40; 3600,273.15 +
        40; 3600,273.15 + 20; 7200,273.15 + 20]) "Water temperature";
  Buildings.Fluid.Sources.Boundary_pT sou_1(
    p=300000 + 5000,
    T=273.15 + 50,
    redeclare package Medium = Medium,
    use_T_in=true,
    nPorts=2);
  Buildings.Fluid.Sources.Boundary_pT sin_1(
    redeclare package Medium = Medium,
    T=273.15 + 20,
    use_p_in=true,
    p=300000,
    nPorts=2);
    FixedResistances.FixedResistanceDpM res_1(
    from_dp=true,
    redeclare package Medium = Medium,
    dp_nominal=5000,
    m_flow_nominal=10);
  Buildings.Fluid.Storage.StratifiedEnhanced tanEnh(
    redeclare package Medium = Medium,
    hTan=3,
    dIns=0.3,
    VTan=5,
    m_flow_nominal=10,
    nSeg=10) "Tank";
    FixedResistances.FixedResistanceDpM res_2(
    from_dp=true,
    redeclare package Medium = Medium,
    dp_nominal=5000,
    m_flow_nominal=10);
  Buildings.Fluid.Sensors.EnthalpyFlowRate HOut_flow(redeclare package Medium
      = Medium) "Enthalpy flow rate";
  Buildings.Fluid.Sensors.EnthalpyFlowRate HOut_flow1(redeclare package Medium
      = Medium) "Enthalpy flow rate";
  Modelica.Blocks.Continuous.Integrator dH 
    "Differenz in enthalpy (should be zero at steady-state)";
  Modelica.Blocks.Math.Add add(k2=-1);
    Modelica.Blocks.Sources.TimeTable P(table=[0,300000; 4200,300000; 4200,
        305000; 7200,305000; 7200,310000; 10800,310000; 10800,305000]) 
    "Pressure boundary condition";
  Modelica.Blocks.Sources.Sine sine(
    freqHz=1/86400,
    amplitude=10,
    offset=273.15 + 20);
  Modelica.Thermal.HeatTransfer.Sources.PrescribedTemperature TBCSid2 
    "Boundary condition for tank";
  Modelica.Thermal.HeatTransfer.Sources.PrescribedTemperature TBCSid1 
    "Boundary condition for tank";
  Modelica.Thermal.HeatTransfer.Sources.PrescribedTemperature TBCTop1 
    "Boundary condition for tank";
  Modelica.Thermal.HeatTransfer.Sources.PrescribedTemperature TBCTop2 
    "Boundary condition for tank";
  inner Modelica.Fluid.System system;
equation 
  connect(TWat.y, sou_1.T_in);
  connect(tanSim.port_b, HOut_flow.port_a);
  connect(HOut_flow.port_b, res_1.port_a);
  connect(tanEnh.port_b, HOut_flow1.port_a);
  connect(HOut_flow1.port_b, res_2.port_a);
  connect(add.y, dH.u);
  connect(HOut_flow.H_flow, add.u1);
  connect(HOut_flow1.H_flow, add.u2);
  connect(P.y, sin_1.p_in);
  connect(sine.y, TBCSid1.T);
  connect(sine.y, TBCTop1.T);
  connect(sine.y, TBCSid2.T);
  connect(sine.y, TBCTop2.T);
  connect(TBCSid2.port, tanEnh.heaPorSid);
  connect(TBCTop2.port, tanEnh.heaPorTop);
  connect(sin_1.ports[1], res_1.port_b);
  connect(sin_1.ports[2], res_2.port_b);
  connect(sou_1.ports[1], tanSim.port_a);
  connect(sou_1.ports[2], tanEnh.port_a);
  connect(TBCSid1.port, tanSim.heaPorSid);
  connect(TBCTop1.port, tanSim.heaPorTop);
end Stratified;

Buildings.Fluid.Storage.Examples.StratifiedLoadingUnloading

Test model for stratified tank

Buildings.Fluid.Storage.Examples.StratifiedLoadingUnloading

Information

Modelica definition

model StratifiedLoadingUnloading "Test model for stratified tank"
  import Buildings;

 package Medium = Buildings.Media.ConstantPropertyLiquidWater "Medium model";
 constant Integer nSeg = 7 "Number of segments in tank";
  Buildings.Fluid.Sources.Boundary_pT sou_1(
    p=300000 + 5000,
    T=273.15 + 40,
    redeclare package Medium = Medium,
    use_T_in=false,
    nPorts=2);
  Sources.MassFlowSource_T sin_1(
    redeclare package Medium = Medium,
    T=273.15 + 20,
    nPorts=1,
    m_flow=-0.028,
    use_m_flow_in=true);
  Buildings.Fluid.Storage.StratifiedEnhanced tanEnh(
    redeclare package Medium = Medium,
    hTan=3,
    dIns=0.3,
    m_flow_nominal=1*1000/3600/4,
    VTan=0.1,
    nSeg=nSeg,
    vol(medium(T(start=ones(nSeg)*273.15 + {50,26.8425,26.6594,26.65958,26.6596,26.6596,26.6596}))),
    show_T=true) "Tank";

  inner Modelica.Fluid.System system;
  Sources.MassFlowSource_T sin_2(
    redeclare package Medium = Medium,
    T=273.15 + 20,
    nPorts=1,
    m_flow=-0.028,
    use_m_flow_in=true);
  Buildings.Fluid.Storage.Stratified tan(
    redeclare package Medium = Medium,
    hTan=3,
    dIns=0.3,
    m_flow_nominal=1*1000/3600/4,
    VTan=0.1,
    nSeg=nSeg,
    vol(medium(T(start=ones(nSeg)*273.15 + {50,26.8425,26.6594,26.65958,26.6596,26.6596,26.6596}))),
    show_T=true) "Tank";

  Modelica.Blocks.Sources.Pulse pulse(
    amplitude=10*0.028,
    offset=-5*0.028,
    period=7200);
equation 
  connect(sou_1.ports[1], tanEnh.port_a);
  connect(tanEnh.port_b, sin_1.ports[1]);
  connect(tan.port_b, sin_2.ports[1]);
  connect(tan.port_a, sou_1.ports[2]);

  connect(pulse.y, sin_1.m_flow_in);
  connect(pulse.y, sin_2.m_flow_in);
end StratifiedLoadingUnloading;

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