Buildings.Fluid.HeatExchangers.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.HeatExchangers.


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

Package Content




NameDescription


ConstantEffectiveness
Model that demonstrates use of a heat exchanger with constant effectiveness


HeaterCoolerPrescribed
Model that tests a heat exchanger model with reverse flow


DryEffectivenessNTU
Model that demonstrates use of a heat exchanger without condensation that uses the epsilon-NTU relation


DryEffectivenessNTUMassFlow
Model of epsilon-NTU dry coil that tests variable mass flow rates


DryEffectivenessNTUPControl
Model that demonstrates use of a heat exchanger without condensation that uses the epsilon-NTU relation with feedback control


DryCoilCounterFlowMassFlow
Model of a cooling coil that tests variable mass flow rates


WetCoilCounterFlowMassFlow
Model of a cooling coil that tests variable mass flow rates


DryCoilCounterFlowPControl
Model that demonstrates use of a heat exchanger without condensation and with feedback control


WetCoilCounterFlowPControl
Model that demonstrates use of a heat exchanger with condensation and with feedback control


DryCoilDiscretized
Model that demonstrates use of a finite volume model of a heat exchanger without condensation


WetCoilDiscretized
Model that demonstrates use of a finite volume model of a heat exchanger with condensation


DryCoilDiscretizedPControl
Model that demonstrates use of a finite volume model of a heat exchanger without condensation and with feedback control


WetCoilDiscretizedPControl
Model that demonstrates use of a finite volume model of a heat exchanger with condensation and feedback control


Buildings.Fluid.HeatExchangers.Examples.BaseClasses BaseClasses
Package with base classes for example models








Buildings.Fluid.HeatExchangers.Examples.ConstantEffectiveness

Model that demonstrates use of a heat exchanger with constant effectiveness

Buildings.Fluid.HeatExchangers.Examples.ConstantEffectiveness

Modelica definition


model ConstantEffectiveness 
  "Model that demonstrates use of a heat exchanger with constant effectiveness"
  import Buildings;

 package Medium1 = Buildings.Media.ConstantPropertyLiquidWater;
 //package Medium2 = Modelica.Media.Air.MoistAir;
// package Medium2 = Buildings.Media.PerfectGases.MoistAir;
//package Medium2 = Buildings.Media.PerfectGases.MoistAirUnsaturated;

 //package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAir;
 package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAirUnsaturated;
  Buildings.Fluid.Sources.Boundary_pT sin_2(                       redeclare 
      package Medium = Medium2,
    use_p_in=true,
    nPorts=1,
    T=273.15 + 10,
    X={0.001,0.999});
    Modelica.Blocks.Sources.Ramp PIn(
    height=200,
    duration=60,
    offset=101325,
    startTime=50);
  Buildings.Fluid.Sources.Boundary_pT sou_2(                       redeclare 
      package Medium = Medium2, T=273.15 + 5,
    use_p_in=true,
    use_T_in=true,
    nPorts=1);
    Modelica.Blocks.Sources.Ramp TWat(
    height=10,
    duration=60,
    offset=273.15 + 30,
    startTime=60) "Water temperature";
  Modelica.Blocks.Sources.Constant TDb(k=293.15) "Drybulb temperature";
    Modelica.Blocks.Sources.Constant POut(k=101325);
  Buildings.Fluid.Sources.Boundary_pT sin_1(                       redeclare 
      package Medium = Medium1,
    use_p_in=true,
    nPorts=1,
    p=300000,
    T=273.15 + 25);
  Buildings.Fluid.Sources.Boundary_pT sou_1(
    redeclare package Medium = Medium1,
    p=300000 + 5000,
    T=273.15 + 50,
    use_T_in=true,
    nPorts=1);
  Buildings.Fluid.HeatExchangers.ConstantEffectiveness hex(redeclare package
      Medium1 =
        Medium1, redeclare package Medium2 = Medium2,
    m1_flow_nominal=5,
    m2_flow_nominal=5,
    dp1_nominal=500,
    dp2_nominal=10);
  inner Modelica.Fluid.System system(
    p_ambient=300000,
    T_ambient=313.15);
  Modelica.Blocks.Sources.Trapezoid trapezoid(
    amplitude=5000,
    rising=10,
    width=100,
    falling=10,
    period=3600,
    offset=300000);
equation 
  connect(PIn.y,sou_2. p_in);
  connect(TDb.y, sou_2.T_in);
  connect(TWat.y, sou_1.T_in);
  connect(sou_1.ports[1], hex.port_a1);
  connect(hex.port_a2, sou_2.ports[1]);
  connect(POut.y, sin_2.p_in);
  connect(hex.port_b1, sin_1.ports[1]);
  connect(sin_2.ports[1], hex.port_b2);
  connect(trapezoid.y, sin_1.p_in);
end ConstantEffectiveness;







Buildings.Fluid.HeatExchangers.Examples.HeaterCoolerPrescribed

Model that tests a heat exchanger model with reverse flow

Buildings.Fluid.HeatExchangers.Examples.HeaterCoolerPrescribed

Information





Model that tests the basic class that is used for the heater models.
It adds and removes heat for forward and reverse flow.
The top and bottom models should give similar results, although 
the sign of the temperature difference over the components differ
because of the reverse flow.
The model uses assert statements that will be triggered if
results that are expected to be close to each other differ by more
than a prescribed threshold.





Modelica definition


model HeaterCoolerPrescribed 
  "Model that tests a heat exchanger model with reverse flow"
  import Buildings;

 package Medium = Buildings.Media.ConstantPropertyLiquidWater;
 //package Medium = Modelica.Media.Air.MoistAir;
 //package Medium = Modelica.Media.Air.SimpleAir;
  Buildings.Fluid.HeatExchangers.HeaterCoolerPrescribed hea1(
                                                         redeclare package
      Medium =
        Medium, Q_flow_nominal=5000,
    m_flow_nominal=0.5,
    dp_nominal=200) "Heater and cooler";
  Modelica.Blocks.Sources.Constant TDb(k=293.15) "Drybulb temperature";
  Buildings.Fluid.Sources.Boundary_pT sou_1(
    redeclare package Medium = Medium,
    use_T_in=true,
    nPorts=4,
    p(displayUnit="Pa") = 101735,
    T=293.15);
    Buildings.Fluid.FixedResistances.FixedResistanceDpM res_11(
    redeclare package Medium = Medium,
    dp_nominal=5,
    m_flow_nominal=0.5);
    Buildings.Fluid.FixedResistances.FixedResistanceDpM res_12(
    redeclare package Medium = Medium,
    dp_nominal=5,
    m_flow_nominal=0.5);
  Buildings.Fluid.Sources.Boundary_pT sin_1(                       redeclare 
      package Medium = Medium,
    use_p_in=true,
    T=288.15,
    nPorts=4);
    Modelica.Blocks.Sources.Constant POut(k=101325);
    Modelica.Blocks.Sources.Ramp u(
    height=2,
    duration=1,
    offset=-1,
    startTime=0) "Control signal";
  Buildings.Fluid.HeatExchangers.HeaterCoolerPrescribed hea2(
                                                 redeclare package Medium =
        Medium, Q_flow_nominal=5000,
    m_flow_nominal=0.5,
    dp_nominal=200) "Heater and cooler";
  Modelica.Blocks.Math.Gain gain(k=-1);
  Buildings.Fluid.HeatExchangers.HeaterCoolerPrescribed hea3(
                                                         redeclare package
      Medium =
        Medium, Q_flow_nominal=5000,
    m_flow_nominal=0.5,
    dp_nominal=200) "Heater and cooler";
    Buildings.Fluid.FixedResistances.FixedResistanceDpM res_2(
    redeclare package Medium = Medium,
    dp_nominal=5,
    m_flow_nominal=0.5);
    Buildings.Fluid.FixedResistances.FixedResistanceDpM res_3(
    redeclare package Medium = Medium,
    dp_nominal=5,
    m_flow_nominal=0.5);
  Buildings.Fluid.HeatExchangers.HeaterCoolerPrescribed hea4(
                                                 redeclare package Medium =
        Medium, Q_flow_nominal=5000,
    m_flow_nominal=0.5,
    dp_nominal=200) "Heater and cooler";
    Buildings.Fluid.FixedResistances.FixedResistanceDpM res_4(
    redeclare package Medium = Medium,
    dp_nominal=5,
    m_flow_nominal=0.5);
  Buildings.Fluid.MixingVolumes.MixingVolume mix1(
                                           redeclare package Medium = Medium, V=
       0.000001,
    nPorts=2);
  Buildings.Utilities.Diagnostics.AssertEquality ass1(startTime=0.2, threShold=
        0.05);
  Buildings.Utilities.Diagnostics.AssertEquality ass2(startTime=0.2, threShold=
        0.05);
  Buildings.Fluid.HeatExchangers.HeaterCoolerPrescribed hea5(
                                                         redeclare package
      Medium =
        Medium, Q_flow_nominal=5000,
    m_flow_nominal=0.5,
    dp_nominal=200) "Heater and cooler";
    Buildings.Fluid.FixedResistances.FixedResistanceDpM res_1(
    redeclare package Medium = Medium,
    dp_nominal=5,
    m_flow_nominal=0.5);
    Buildings.Fluid.FixedResistances.FixedResistanceDpM res_5(
    redeclare package Medium = Medium,
    dp_nominal=5,
    m_flow_nominal=0.5);
  Buildings.Fluid.HeatExchangers.HeaterCoolerPrescribed hea6(
                                                 redeclare package Medium =
        Medium, Q_flow_nominal=5000,
    m_flow_nominal=0.5,
    dp_nominal=200) "Heater and cooler";
  Buildings.Fluid.HeatExchangers.HeaterCoolerPrescribed hea7(
                                                         redeclare package
      Medium =
        Medium, Q_flow_nominal=5000,
    m_flow_nominal=0.5,
    dp_nominal=200) "Heater and cooler";
    Buildings.Fluid.FixedResistances.FixedResistanceDpM res_6(
    redeclare package Medium = Medium,
    dp_nominal=5,
    m_flow_nominal=0.5);
    Buildings.Fluid.FixedResistances.FixedResistanceDpM res_7(
    redeclare package Medium = Medium,
    dp_nominal=5,
    m_flow_nominal=0.5);
  Buildings.Fluid.HeatExchangers.HeaterCoolerPrescribed hea8(
                                                 redeclare package Medium =
        Medium, Q_flow_nominal=5000,
    m_flow_nominal=0.5,
    dp_nominal=200) "Heater and cooler";
    Buildings.Fluid.FixedResistances.FixedResistanceDpM res_8(
    redeclare package Medium = Medium,
    dp_nominal=5,
    m_flow_nominal=0.5);
  Buildings.Fluid.MixingVolumes.MixingVolume mix2(
                                           redeclare package Medium = Medium, V=
       0.000001,
    nPorts=2);
  Buildings.Utilities.Diagnostics.AssertEquality ass9(                startTime=
        0.3, threShold=0.05);
  Buildings.Utilities.Diagnostics.AssertEquality ass10(                startTime=
        0.3, threShold=0.05);
  inner Modelica.Fluid.System system(m_flow_start=0);
  Buildings.Fluid.Sensors.Temperature senTem2a(redeclare package Medium = Medium) 
    "Temperature sensor";
  Buildings.Fluid.Sensors.Temperature senTem2b(redeclare package Medium = Medium) 
    "Temperature sensor";
  Buildings.Fluid.Sensors.Temperature senTem1a(redeclare package Medium = Medium) 
    "Temperature sensor";
  Buildings.Fluid.Sensors.Temperature senTem1b(redeclare package Medium = Medium) 
    "Temperature sensor";
  Buildings.Fluid.Sensors.Temperature senTem3a(redeclare package Medium = Medium) 
    "Temperature sensor";
  Buildings.Fluid.Sensors.Temperature senTem3b(redeclare package Medium = Medium) 
    "Temperature sensor";
  Buildings.Fluid.Sensors.Temperature senTem4a(redeclare package Medium = Medium) 
    "Temperature sensor";
  Buildings.Fluid.Sensors.Temperature senTem4b(redeclare package Medium = Medium) 
    "Temperature sensor";
  Buildings.Utilities.Diagnostics.AssertEquality ass3(startTime=0.2, threShold=
        0.05);
  Buildings.Utilities.Diagnostics.AssertEquality ass4(startTime=0.2, threShold=
        0.05);
  Buildings.Utilities.Diagnostics.AssertEquality ass5(startTime=0.2, threShold=
        0.05);
  Buildings.Utilities.Diagnostics.AssertEquality ass6(startTime=0.2, threShold=
        0.05);
  Buildings.Fluid.Sensors.Temperature senTem6b(redeclare package Medium = Medium) 
    "Temperature sensor";
  Buildings.Fluid.Sensors.Temperature senTem6a(redeclare package Medium = Medium) 
    "Temperature sensor";
  Buildings.Fluid.Sensors.Temperature senTem5b(redeclare package Medium = Medium) 
    "Temperature sensor";
  Buildings.Fluid.Sensors.Temperature senTem5a(redeclare package Medium = Medium) 
    "Temperature sensor";
  Buildings.Utilities.Diagnostics.AssertEquality ass7(startTime=0.2, threShold=
        0.05);
  Buildings.Utilities.Diagnostics.AssertEquality ass8(startTime=0.2, threShold=
        0.05);
  Buildings.Fluid.Sensors.Temperature senTem8b(redeclare package Medium = Medium) 
    "Temperature sensor";
  Buildings.Fluid.Sensors.Temperature senTem8a(redeclare package Medium = Medium) 
    "Temperature sensor";
  Buildings.Fluid.Sensors.Temperature senTem7b(redeclare package Medium = Medium) 
    "Temperature sensor";
  Buildings.Fluid.Sensors.Temperature senTem7a(redeclare package Medium = Medium) 
    "Temperature sensor";
equation 
  connect(POut.y,sin_1. p_in);
  connect(TDb.y,sou_1. T_in);
  connect(res_11.port_b, hea1.port_a);
  connect(u.y, hea1.u);
  connect(gain.y, hea2.u);
  connect(u.y, gain.u);
  connect(res_12.port_b, hea2.port_a);
  connect(res_2.port_b, hea3.port_a);
  connect(u.y, hea3.u);
  connect(gain.y, hea4.u);
  connect(res_3.port_b, hea4.port_a);
  connect(hea4.port_b, res_4.port_b);
  connect(hea1.port_b, hea2.port_b);
  connect(res_1.port_b, hea5.port_a);
  connect(res_5.port_b, hea6.port_a);
  connect(res_6.port_b,hea7. port_a);
  connect(res_7.port_b,hea8. port_a);
  connect(hea8.port_b,res_8. port_b);
  connect(hea5.port_b,hea6. port_b);
  connect(u.y, hea6.u);
  connect(u.y, hea8.u);
  connect(gain.y, hea5.u);
  connect(gain.y, hea7.u);
  connect(sin_1.ports[1], res_12.port_a);
  connect(sin_1.ports[2], res_3.port_a);
  connect(sou_1.ports[1], res_11.port_a);
  connect(sou_1.ports[2], res_2.port_a);
  connect(sin_1.ports[3], res_1.port_a);
  connect(sin_1.ports[4], res_6.port_a);
  connect(sou_1.ports[3], res_5.port_a);
  connect(sou_1.ports[4], res_7.port_a);
  connect(hea3.port_b, mix1.ports[1]);
  connect(mix1.ports[2], res_4.port_a);
  connect(hea7.port_b, mix2.ports[1]);
  connect(mix2.ports[2], res_8.port_a);
  connect(hea2.port_a, senTem2a.port);
  connect(hea2.port_b, senTem2b.port);
  connect(hea1.port_a, senTem1a.port);
  connect(hea1.port_b, senTem1b.port);
  connect(senTem1a.T, ass1.u1);
  connect(senTem2a.T, ass1.u2);
  connect(senTem1b.T, ass2.u2);
  connect(senTem2b.T, ass2.u1);
  connect(senTem4a.T, ass4.u2);
  connect(senTem3a.T, ass4.u1);
  connect(senTem4b.T, ass3.u1);
  connect(senTem3b.T, ass3.u2);
  connect(hea3.port_a, senTem3a.port);
  connect(hea3.port_b, senTem3b.port);
  connect(hea4.port_a, senTem4a.port);
  connect(hea4.port_b, senTem4b.port);
  connect(senTem6a.T, ass6.u2);
  connect(senTem5a.T, ass6.u1);
  connect(senTem6b.T, ass5.u1);
  connect(senTem5b.T, ass5.u2);
  connect(hea6.port_a, senTem6a.port);
  connect(hea6.port_b, senTem6b.port);
  connect(hea5.port_a, senTem5a.port);
  connect(hea5.port_b, senTem5b.port);
  connect(senTem8a.T, ass8.u2);
  connect(senTem7a.T, ass8.u1);
  connect(senTem8b.T, ass7.u1);
  connect(senTem7b.T, ass7.u2);
  connect(hea8.port_a, senTem8a.port);
  connect(hea8.port_b, senTem8b.port);
  connect(hea7.port_a, senTem7a.port);
  connect(hea7.port_b, senTem7b.port);
  connect(senTem3a.T, ass10.u1);
  connect(senTem7a.T, ass10.u2);
  connect(senTem2b.T, ass9.u1);
  connect(senTem5b.T, ass9.u2);
end HeaterCoolerPrescribed;







Buildings.Fluid.HeatExchangers.Examples.DryEffectivenessNTU

Model that demonstrates use of a heat exchanger without condensation that uses the epsilon-NTU relation

Buildings.Fluid.HeatExchangers.Examples.DryEffectivenessNTU

Parameters




TypeNameDefaultDescription


SpecificHeatCapacitycp1Medium1.specificHeatCapacity...Specific heat capacity of medium 2 [J/(kg.K)]


SpecificHeatCapacitycp2Medium2.specificHeatCapacity...Specific heat capacity of medium 2 [J/(kg.K)]


MassFlowRatem1_flow5Nominal mass flow rate medium 1 [kg/s]


MassFlowRatem2_flowm1_flow*cp1/cp2Nominal mass flow rate medium 2 [kg/s]




Modelica definition


model DryEffectivenessNTU 
  "Model that demonstrates use of a heat exchanger without condensation that uses the epsilon-NTU relation"
  import Buildings;

 package Medium1 = Buildings.Media.ConstantPropertyLiquidWater;
 //package Medium2 = Modelica.Media.Air.MoistAir;
// package Medium2 = Buildings.Media.PerfectGases.MoistAir;
//package Medium2 = Buildings.Media.PerfectGases.MoistAirUnsaturated;

 //package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAir;
// package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAirUnsaturated;
   package Medium2 = Buildings.Media.IdealGases.SimpleAir;
 //package Medium2 = Medium1;

 parameter Modelica.SIunits.SpecificHeatCapacity cp1=
 Medium1.specificHeatCapacityCp(
      Medium1.setState_pTX(Medium1.p_default, Medium1.T_default, Medium1.X_default)) 
    "Specific heat capacity of medium 2";
 parameter Modelica.SIunits.SpecificHeatCapacity cp2=
 Medium2.specificHeatCapacityCp(
      Medium2.setState_pTX(Medium2.p_default, Medium2.T_default, Medium2.X_default)) 
    "Specific heat capacity of medium 2";
 parameter Modelica.SIunits.MassFlowRate m1_flow = 5 
    "Nominal mass flow rate medium 1";
 parameter Modelica.SIunits.MassFlowRate m2_flow = m1_flow*cp1/
      cp2 "Nominal mass flow rate medium 2";

  Buildings.Fluid.Sources.Boundary_pT sin_2(                       redeclare 
      package Medium = Medium2,
    use_p_in=true,
    nPorts=5,
    T=273.15 + 10);
    Modelica.Blocks.Sources.Ramp PIn(
    height=200,
    duration=60,
    offset=101325,
    startTime=100);
  Buildings.Fluid.Sources.Boundary_pT sou_2(                       redeclare 
      package Medium = Medium2, T=273.15 + 5,
    use_p_in=true,
    use_T_in=true,
    nPorts=5);
    Modelica.Blocks.Sources.Ramp TWat(
    height=10,
    duration=60,
    offset=273.15 + 30,
    startTime=60) "Water temperature";
  Modelica.Blocks.Sources.Constant TDb(k=293.15) "Drybulb temperature";
    Modelica.Blocks.Sources.Constant POut(k=101325);
  Buildings.Fluid.Sources.Boundary_pT sin_1(                       redeclare 
      package Medium = Medium1,
    use_p_in=true,
    nPorts=5,
    p=300000,
    T=273.15 + 25);
  Buildings.Fluid.Sources.Boundary_pT sou_1(
    redeclare package Medium = Medium1,
    p=300000 + 5000,
    T=273.15 + 50,
    use_T_in=true,
    nPorts=5);
  Buildings.Fluid.HeatExchangers.DryEffectivenessNTU hexPar(
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    dp1_nominal=500,
    dp2_nominal=10,
    m1_flow_nominal=m1_flow,
    m2_flow_nominal=m2_flow,
    Q_flow_nominal=m2_flow*cp2*(24 - 20),
    T_a1_nominal=303.15,
    T_a2_nominal=293.15,
    configuration=Buildings.Fluid.Types.HeatExchangerConfiguration.ParallelFlow);

  inner Modelica.Fluid.System system(
    p_ambient=300000,
    T_ambient=313.15);
  Buildings.Fluid.HeatExchangers.DryEffectivenessNTU hexCou(
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    dp1_nominal=500,
    dp2_nominal=10,
    m1_flow_nominal=m1_flow,
    m2_flow_nominal=m2_flow,
    Q_flow_nominal=m2_flow*cp2*(24 - 20),
    T_a1_nominal=303.15,
    T_a2_nominal=293.15,
    configuration=Buildings.Fluid.Types.HeatExchangerConfiguration.CounterFlow);
  Buildings.Fluid.HeatExchangers.DryEffectivenessNTU hexCroC1Mix(
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    dp1_nominal=500,
    dp2_nominal=10,
    m1_flow_nominal=m1_flow,
    m2_flow_nominal=m2_flow,
    Q_flow_nominal=m2_flow*cp2*(24 - 20),
    T_a1_nominal=303.15,
    T_a2_nominal=293.15,
    configuration=Buildings.Fluid.Types.HeatExchangerConfiguration.CrossFlowStream1MixedStream2Unmixed);
  Buildings.Fluid.HeatExchangers.DryEffectivenessNTU hexCroC1Unm(
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    dp1_nominal=500,
    dp2_nominal=10,
    m1_flow_nominal=m1_flow,
    m2_flow_nominal=m2_flow,
    Q_flow_nominal=m2_flow*cp2*(24 - 20),
    T_a1_nominal=303.15,
    T_a2_nominal=293.15,
    configuration=Buildings.Fluid.Types.HeatExchangerConfiguration.CrossFlowStream1UnmixedStream2Mixed);
  Buildings.Fluid.HeatExchangers.DryEffectivenessNTU hexCroUnm(
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    dp1_nominal=500,
    dp2_nominal=10,
    m1_flow_nominal=m1_flow,
    m2_flow_nominal=m2_flow,
    Q_flow_nominal=m2_flow*cp2*(24 - 20),
    T_a1_nominal=303.15,
    T_a2_nominal=293.15,
    configuration=Buildings.Fluid.Types.HeatExchangerConfiguration.CrossFlowUnmixed);
  Modelica.Blocks.Sources.Trapezoid trapezoid(
    amplitude=5000,
    rising=10,
    width=100,
    falling=10,
    period=3600,
    offset=300000);
equation 
  connect(PIn.y,sou_2. p_in);
  connect(TDb.y, sou_2.T_in);
  connect(TWat.y, sou_1.T_in);
  connect(sou_1.ports[1], hexPar.port_a1);
  connect(hexPar.port_a2, sou_2.ports[1]);
  connect(POut.y, sin_2.p_in);
  connect(hexPar.port_b1, sin_1.ports[1]);
  connect(sin_2.ports[1], hexPar.port_b2);
  connect(hexCou.port_a1, sou_1.ports[2]);
  connect(hexCroC1Mix.port_a1, sou_1.ports[3]);
  connect(hexCroC1Unm.port_a1, sou_1.ports[4]);
  connect(hexCou.port_b2, sin_2.ports[2]);
  connect(hexCroC1Mix.port_b2, sin_2.ports[3]);
  connect(hexCroC1Unm.port_b2, sin_2.ports[4]);
  connect(hexCou.port_b1, sin_1.ports[2]);
  connect(hexCroC1Mix.port_b1, sin_1.ports[3]);
  connect(hexCroC1Unm.port_b1, sin_1.ports[4]);
  connect(hexCou.port_a2, sou_2.ports[2]);
  connect(hexCroC1Mix.port_a2, sou_2.ports[3]);
  connect(hexCroC1Unm.port_a2, sou_2.ports[4]);
  connect(hexCroUnm.port_a1, sou_1.ports[5]);
  connect(hexCroUnm.port_b2, sin_2.ports[5]);
  connect(hexCroUnm.port_b1, sin_1.ports[5]);
  connect(hexCroUnm.port_a2, sou_2.ports[5]);
  connect(trapezoid.y, sin_1.p_in);
end DryEffectivenessNTU;







Buildings.Fluid.HeatExchangers.Examples.DryEffectivenessNTUMassFlow

Model of epsilon-NTU dry coil that tests variable mass flow rates

Buildings.Fluid.HeatExchangers.Examples.DryEffectivenessNTUMassFlow

Information

Extends from Buildings.Fluid.HeatExchangers.Examples.BaseClasses.EffectivenessNTUMassFlow (Partial model of epsilon-NTU coil that tests variable mass flow rates).

Parameters




TypeNameDefaultDescription


TemperatureT_a1_nominal5 + 273.15[K]


TemperatureT_b1_nominal10 + 273.15[K]


TemperatureT_a2_nominal30 + 273.15[K]


TemperatureT_b2_nominal15 + 273.15[K]


HeatFlowRateQ_flow_nominalm1_flow_nominal*4200*(T_a1_n...Nominal heat transfer [W]


MassFlowRatem1_flow_nominal0.1Nominal mass flow rate medium 1 [kg/s]


MassFlowRatem2_flow_nominalm1_flow_nominal*4200/1000*(T...Nominal mass flow rate medium 2 [kg/s]




Modelica definition


model DryEffectivenessNTUMassFlow 
  "Model of epsilon-NTU dry coil that tests variable mass flow rates"
  import Buildings;
  extends Buildings.Fluid.HeatExchangers.Examples.BaseClasses.EffectivenessNTUMassFlow
    (
    sou_1(nPorts=1),
    sin_1(nPorts=1),
    sou_2(nPorts=1),
    sin_2(nPorts=1));

  Buildings.Fluid.HeatExchangers.DryEffectivenessNTU hex(
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    m1_flow_nominal=m1_flow_nominal,
    m2_flow_nominal=m2_flow_nominal,
    dp2_nominal(displayUnit="Pa") = 200,
    configuration=Buildings.Fluid.Types.HeatExchangerConfiguration.CounterFlow,
    allowFlowReversal1=true,
    allowFlowReversal2=true,
    dp1_nominal(displayUnit="Pa") = 3000,
    Q_flow_nominal=Q_flow_nominal,
    T_a1_nominal=T_a1_nominal,
    T_a2_nominal=T_a2_nominal);

equation 
  connect(sou_1.ports[1], hex.port_a1);
  connect(hex.port_b1, sin_1.ports[1]);
  connect(hex.port_a2, sou_2.ports[1]);
  connect(sin_2.ports[1], hex.port_b2);
  connect(senRelHum.port, hex.port_b2);
end DryEffectivenessNTUMassFlow;







Buildings.Fluid.HeatExchangers.Examples.DryEffectivenessNTUPControl

Model that demonstrates use of a heat exchanger without condensation that uses the epsilon-NTU relation with feedback control

Buildings.Fluid.HeatExchangers.Examples.DryEffectivenessNTUPControl

Parameters




TypeNameDefaultDescription


TemperatureT_a1_nominal60 + 273.15[K]


TemperatureT_b1_nominal50 + 273.15[K]


TemperatureT_a2_nominal20 + 273.15[K]


TemperatureT_b2_nominal40 + 273.15[K]


MassFlowRatem1_flow_nominal5Nominal mass flow rate medium 1 [kg/s]


MassFlowRatem2_flow_nominalm1_flow_nominal*4200/1000*(T...Nominal mass flow rate medium 2 [kg/s]




Modelica definition


model DryEffectivenessNTUPControl 
  "Model that demonstrates use of a heat exchanger without condensation that uses the epsilon-NTU relation with feedback control"
  import Buildings;

 package Medium1 = Buildings.Media.ConstantPropertyLiquidWater;
 //package Medium2 = Buildings.Media.PerfectGases.MoistAir;
 //package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAir;
 // package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAirUnsaturated;
 package Medium2 = Buildings.Media.GasesPTDecoupled.SimpleAir;
  parameter Modelica.SIunits.Temperature T_a1_nominal = 60+273.15;
  parameter Modelica.SIunits.Temperature T_b1_nominal = 50+273.15;
  parameter Modelica.SIunits.Temperature T_a2_nominal = 20+273.15;
  parameter Modelica.SIunits.Temperature T_b2_nominal = 40+273.15;
  parameter Modelica.SIunits.MassFlowRate m1_flow_nominal = 5 
    "Nominal mass flow rate medium 1";
  parameter Modelica.SIunits.MassFlowRate m2_flow_nominal = m1_flow_nominal*4200/1000*(T_a1_nominal-T_b1_nominal)/(T_b2_nominal-T_a2_nominal) 
    "Nominal mass flow rate medium 2";

  Buildings.Fluid.Sources.Boundary_pT sin_2(                       redeclare 
      package Medium = Medium2,
    nPorts=1,
    use_p_in=false,
    p(displayUnit="Pa") = 101325,
    T=303.15);
  Buildings.Fluid.Sources.Boundary_pT sou_2(                       redeclare 
      package Medium = Medium2,
    nPorts=1,
    use_p_in=false,
    use_T_in=false,
    p(displayUnit="Pa") = 101625,
    T=T_a2_nominal);
  Buildings.Fluid.Sources.Boundary_pT sin_1(                       redeclare 
      package Medium = Medium1,
    p=300000,
    T=293.15,
    nPorts=1,
    use_p_in=true);
  Buildings.Fluid.Sources.Boundary_pT sou_1(
    redeclare package Medium = Medium1,
    p=300000 + 9000,
    nPorts=1,
    use_T_in=false,
    T=T_a1_nominal);
    Fluid.FixedResistances.FixedResistanceDpM res_2(
    from_dp=true,
    redeclare package Medium = Medium2,
    m_flow_nominal=m2_flow_nominal,
    dp_nominal=200 + 100);
    Fluid.FixedResistances.FixedResistanceDpM res_1(
    from_dp=true,
    redeclare package Medium = Medium1,
    m_flow_nominal=5,
    dp_nominal=2000 + 3000);
    Modelica.Blocks.Sources.Ramp PSin_1(
    duration=60,
    height=5000,
    startTime=240,
    offset=300000);
  Buildings.Fluid.Sensors.TemperatureTwoPort temSen(redeclare package Medium =
        Medium2);
  Buildings.Fluid.Actuators.Valves.TwoWayEqualPercentage val(
    redeclare package Medium = Medium1,
    l=0.005,
    Kv_SI=5/sqrt(4000),
    m_flow_nominal=m1_flow_nominal) "Valve model";
  Buildings.Controls.Continuous.LimPID P(
                              k=1,
    Ti=60,
    controllerType=Modelica.Blocks.Types.SimpleController.P);
  Modelica.Blocks.Sources.TimeTable TSet(table=[0,330.15; 600,298.15; 600,
        303.15; 1200,303.15; 1800,298.15; 2400,298.15; 2400,304.15]) 
    "Setpoint temperature";
  Buildings.Fluid.HeatExchangers.DryEffectivenessNTU hex(
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    m1_flow_nominal=m1_flow_nominal,
    m2_flow_nominal=m2_flow_nominal,
    Q_flow_nominal=m1_flow_nominal*4200*(T_a1_nominal-T_b1_nominal),
    configuration=Buildings.Fluid.Types.HeatExchangerConfiguration.CounterFlow,
    T_a1_nominal=T_a1_nominal,
    T_a2_nominal=T_a2_nominal,
    dp1_nominal(displayUnit="Pa") = 0,
    dp2_nominal(displayUnit="Pa") = 0);

  Buildings.Fluid.Actuators.Motors.IdealMotor mot(tOpe=60) "Motor model";
  inner Modelica.Fluid.System system;
equation 
  connect(PSin_1.y, sin_1.p_in);
  connect(hex.port_b1, res_1.port_a);
  connect(val.port_b, hex.port_a1);
  connect(sou_1.ports[1], val.port_a);
  connect(sin_1.ports[1], res_1.port_b);
  connect(sin_2.ports[1], res_2.port_b);
  connect(sou_2.ports[1], hex.port_a2);
  connect(hex.port_b2, temSen.port_a);
  connect(temSen.port_b, res_2.port_a);
  connect(TSet.y, P.u_s);
  connect(temSen.T, P.u_m);
  connect(mot.y, val.y);
  connect(P.y, mot.u);
end DryEffectivenessNTUPControl;







Buildings.Fluid.HeatExchangers.Examples.DryCoilCounterFlowMassFlow

Model of a cooling coil that tests variable mass flow rates

Buildings.Fluid.HeatExchangers.Examples.DryCoilCounterFlowMassFlow

Information

Extends from Buildings.Fluid.HeatExchangers.Examples.BaseClasses.EffectivenessNTUMassFlow (Partial model of epsilon-NTU coil that tests variable mass flow rates).

Parameters




TypeNameDefaultDescription


TemperatureT_a1_nominal5 + 273.15[K]


TemperatureT_b1_nominal10 + 273.15[K]


TemperatureT_a2_nominal30 + 273.15[K]


TemperatureT_b2_nominal15 + 273.15[K]


HeatFlowRateQ_flow_nominalm1_flow_nominal*4200*(T_a1_n...Nominal heat transfer [W]


MassFlowRatem1_flow_nominal0.1Nominal mass flow rate medium 1 [kg/s]


MassFlowRatem2_flow_nominalm1_flow_nominal*4200/1000*(T...Nominal mass flow rate medium 2 [kg/s]




Modelica definition


model DryCoilCounterFlowMassFlow 
  "Model of a cooling coil that tests variable mass flow rates"
  extends Buildings.Fluid.HeatExchangers.Examples.BaseClasses.EffectivenessNTUMassFlow
    (
    sou_1(nPorts=1),
    sin_1(nPorts=1),
    sin_2(nPorts=1),
    sou_2(nPorts=1));

  DryCoilCounterFlow hex(
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    m1_flow_nominal=m1_flow_nominal,
    m2_flow_nominal=m2_flow_nominal,
    dp2_nominal(displayUnit="Pa") = 200,
    allowFlowReversal1=true,
    allowFlowReversal2=true,
    dp1_nominal(displayUnit="Pa") = 3000,
    UA_nominal=Q_flow_nominal/Buildings.Fluid.HeatExchangers.BaseClasses.lmtd(
        T_a1_nominal,
        T_b1_nominal,
        T_a2_nominal,
        T_b2_nominal));

  inner Modelica.Fluid.System system;
equation 
  connect(sou_1.ports[1], hex.port_a1);
  connect(hex.port_b1, sin_1.ports[1]);
  connect(sin_2.ports[1], hex.port_b2);
  connect(hex.port_a2, sou_2.ports[1]);
  connect(senRelHum.port, hex.port_b2);
end DryCoilCounterFlowMassFlow;







Buildings.Fluid.HeatExchangers.Examples.WetCoilCounterFlowMassFlow

Model of a cooling coil that tests variable mass flow rates

Buildings.Fluid.HeatExchangers.Examples.WetCoilCounterFlowMassFlow

Information

Extends from Buildings.Fluid.HeatExchangers.Examples.BaseClasses.EffectivenessNTUMassFlow (Partial model of epsilon-NTU coil that tests variable mass flow rates).

Parameters




TypeNameDefaultDescription


TemperatureT_a1_nominal5 + 273.15[K]


TemperatureT_b1_nominal10 + 273.15[K]


TemperatureT_a2_nominal30 + 273.15[K]


TemperatureT_b2_nominal15 + 273.15[K]


HeatFlowRateQ_flow_nominalm1_flow_nominal*4200*(T_a1_n...Nominal heat transfer [W]


MassFlowRatem1_flow_nominal0.1Nominal mass flow rate medium 1 [kg/s]


MassFlowRatem2_flow_nominalm1_flow_nominal*4200/1000*(T...Nominal mass flow rate medium 2 [kg/s]




Modelica definition


model WetCoilCounterFlowMassFlow 
  "Model of a cooling coil that tests variable mass flow rates"
  extends Buildings.Fluid.HeatExchangers.Examples.BaseClasses.EffectivenessNTUMassFlow
    (
    sou_1(nPorts=1),
    sin_1(nPorts=1),
    sin_2(nPorts=1),
    sou_2(nPorts=1));

  WetCoilCounterFlow hex(
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    m1_flow_nominal=m1_flow_nominal,
    m2_flow_nominal=m2_flow_nominal,
    dp2_nominal(displayUnit="Pa") = 200,
    allowFlowReversal1=true,
    allowFlowReversal2=true,
    dp1_nominal(displayUnit="Pa") = 3000,
    UA_nominal=Q_flow_nominal/Buildings.Fluid.HeatExchangers.BaseClasses.lmtd(
        T_a1_nominal,
        T_b1_nominal,
        T_a2_nominal,
        T_b2_nominal));

  inner Modelica.Fluid.System system;
equation 
  connect(sou_1.ports[1], hex.port_a1);
  connect(hex.port_b1, sin_1.ports[1]);
  connect(sin_2.ports[1], hex.port_b2);
  connect(hex.port_a2, sou_2.ports[1]);
  connect(senRelHum.port, hex.port_b2);
end WetCoilCounterFlowMassFlow;







Buildings.Fluid.HeatExchangers.Examples.DryCoilCounterFlowPControl

Model that demonstrates use of a heat exchanger without condensation and with feedback control

Buildings.Fluid.HeatExchangers.Examples.DryCoilCounterFlowPControl

Parameters




TypeNameDefaultDescription


TemperatureT_a1_nominal5 + 273.15[K]


TemperatureT_b1_nominal10 + 273.15[K]


TemperatureT_a2_nominal30 + 273.15[K]


TemperatureT_b2_nominal15 + 273.15[K]


MassFlowRatem1_flow_nominal0.1Nominal mass flow rate medium 1 [kg/s]


MassFlowRatem2_flow_nominalm1_flow_nominal*4200/1000*(T...Nominal mass flow rate medium 2 [kg/s]




Modelica definition


model DryCoilCounterFlowPControl 
  "Model that demonstrates use of a heat exchanger without condensation and with feedback control"
  import Buildings;
  package Medium1 = Buildings.Media.ConstantPropertyLiquidWater;
  package Medium2 = Buildings.Media.PerfectGases.MoistAirUnsaturated;
  //package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAir;
  //package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAirUnsaturated;
  //package Medium2 = Buildings.Media.GasesConstantDensity.MoistAir;
  parameter Modelica.SIunits.Temperature T_a1_nominal=5 + 273.15;
  parameter Modelica.SIunits.Temperature T_b1_nominal=10 + 273.15;
  parameter Modelica.SIunits.Temperature T_a2_nominal=30 + 273.15;
  parameter Modelica.SIunits.Temperature T_b2_nominal=15 + 273.15;
  parameter Modelica.SIunits.MassFlowRate m1_flow_nominal=0.1 
    "Nominal mass flow rate medium 1";
  parameter Modelica.SIunits.MassFlowRate m2_flow_nominal=m1_flow_nominal*4200/
      1000*(T_a1_nominal - T_b1_nominal)/(T_b2_nominal - T_a2_nominal) 
    "Nominal mass flow rate medium 2";
  Buildings.Fluid.Sources.Boundary_pT sin_2(
    redeclare package Medium = Medium2,
    nPorts=1,
    use_p_in=false,
    p(displayUnit="Pa") = 101325,
    T=303.15);
  Buildings.Fluid.Sources.Boundary_pT sou_2(
    redeclare package Medium = Medium2,
    nPorts=1,
    T=T_a2_nominal,
    X={0.02,1 - 0.02},
    use_T_in=true,
    use_X_in=true,
    p(displayUnit="Pa") = 101325 + 300);
  Buildings.Fluid.Sources.Boundary_pT sin_1(
    redeclare package Medium = Medium1,
    nPorts=1,
    use_p_in=false,
    p=300000,
    T=293.15);
  Buildings.Fluid.Sources.Boundary_pT sou_1(
    redeclare package Medium = Medium1,
    nPorts=1,
    use_T_in=true,
    p=300000 + 12000);
  Fluid.FixedResistances.FixedResistanceDpM res_2(
    from_dp=true,
    redeclare package Medium = Medium2,
    dp_nominal=100,
    m_flow_nominal=m2_flow_nominal);
  Fluid.FixedResistances.FixedResistanceDpM res_1(
    from_dp=true,
    redeclare package Medium = Medium1,
    dp_nominal=3000,
    m_flow_nominal=m1_flow_nominal);
  Buildings.Fluid.Sensors.TemperatureDryBulbDynamic temSen(redeclare package
      Medium = Medium2, m_flow_nominal=m2_flow_nominal);
  Buildings.Fluid.Actuators.Valves.TwoWayEqualPercentage val(
    redeclare package Medium = Medium1,
    m_flow_nominal=m1_flow_nominal) "Valve model";
  Modelica.Blocks.Sources.TimeTable TSet(table=[0,288.15; 600,288.15; 600,
        298.15; 1200,298.15; 1800,283.15; 2400,283.15; 2400,288.15]) 
    "Setpoint temperature";
  Buildings.Fluid.HeatExchangers.DryCoilCounterFlow hex(
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    m1_flow_nominal=m1_flow_nominal,
    m2_flow_nominal=m2_flow_nominal,
    dp2_nominal(displayUnit="Pa") = 200,
    allowFlowReversal1=true,
    allowFlowReversal2=true,
    dp1_nominal(displayUnit="Pa") = 3000,
    UA_nominal=m1_flow_nominal*4200*(T_a1_nominal - T_b1_nominal)/
       Buildings.Fluid.HeatExchangers.BaseClasses.lmtd(
        T_a1_nominal,
        T_b1_nominal,
        T_a2_nominal,
        T_b2_nominal));

  inner Modelica.Fluid.System system;
  Modelica.Blocks.Sources.Constant const(k=0.8);
  Buildings.Utilities.Psychrometrics.X_pTphi x_pTphi(use_p_in=false, redeclare 
      package Medium = Medium2);
  Modelica.Blocks.Sources.Constant const1(k=T_a2_nominal);
  Buildings.Controls.Continuous.LimPID limPID(
    Td=1,
    reverseAction=true,
    yMin=0,
    controllerType=Modelica.Blocks.Types.SimpleController.PI,
    Ti=60);
  Buildings.Fluid.Sensors.RelativeHumidity senRelHum(redeclare package Medium
      = Medium2);
  Modelica.Blocks.Sources.Ramp TWat(
    height=30,
    offset=T_a1_nominal,
    startTime=300,
    duration=2000) "Water temperature, raised to high value at t=3000 s";
equation 
  connect(hex.port_b1, res_1.port_a);
  connect(val.port_b, hex.port_a1);
  connect(sou_1.ports[1], val.port_a);
  connect(sin_1.ports[1], res_1.port_b);
  connect(sin_2.ports[1], res_2.port_b);
  connect(sou_2.ports[1], hex.port_a2);
  connect(hex.port_b2, temSen.port_a);
  connect(temSen.port_b, res_2.port_a);
  connect(x_pTphi.X, sou_2.X_in);
  connect(const.y, x_pTphi.phi);
  connect(const1.y, x_pTphi.T);
  connect(const1.y, sou_2.T_in);
  connect(TSet.y, limPID.u_s);
  connect(temSen.T, limPID.u_m);
  connect(senRelHum.port, hex.port_b2);
  connect(TWat.y, sou_1.T_in);
  connect(limPID.y, val.y);
end DryCoilCounterFlowPControl;







Buildings.Fluid.HeatExchangers.Examples.WetCoilCounterFlowPControl

Model that demonstrates use of a heat exchanger with condensation and with feedback control

Buildings.Fluid.HeatExchangers.Examples.WetCoilCounterFlowPControl

Parameters




TypeNameDefaultDescription


TemperatureT_a1_nominal5 + 273.15[K]


TemperatureT_b1_nominal10 + 273.15[K]


TemperatureT_a2_nominal30 + 273.15[K]


TemperatureT_b2_nominal15 + 273.15[K]


MassFlowRatem1_flow_nominal0.1Nominal mass flow rate medium 1 [kg/s]


MassFlowRatem2_flow_nominalm1_flow_nominal*4200/1000*(T...Nominal mass flow rate medium 2 [kg/s]




Modelica definition


model WetCoilCounterFlowPControl 
  "Model that demonstrates use of a heat exchanger with condensation and with feedback control"
  import Buildings;
  package Medium1 = Buildings.Media.ConstantPropertyLiquidWater;
  package Medium2 = Buildings.Media.PerfectGases.MoistAirUnsaturated;
  //package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAir;
  //package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAirUnsaturated;
  //package Medium2 = Buildings.Media.GasesConstantDensity.MoistAir;
  parameter Modelica.SIunits.Temperature T_a1_nominal=5 + 273.15;
  parameter Modelica.SIunits.Temperature T_b1_nominal=10 + 273.15;
  parameter Modelica.SIunits.Temperature T_a2_nominal=30 + 273.15;
  parameter Modelica.SIunits.Temperature T_b2_nominal=15 + 273.15;
  parameter Modelica.SIunits.MassFlowRate m1_flow_nominal=0.1 
    "Nominal mass flow rate medium 1";
  parameter Modelica.SIunits.MassFlowRate m2_flow_nominal=m1_flow_nominal*4200/
      1000*(T_a1_nominal - T_b1_nominal)/(T_b2_nominal - T_a2_nominal) 
    "Nominal mass flow rate medium 2";
  Buildings.Fluid.Sources.Boundary_pT sin_2(
    redeclare package Medium = Medium2,
    nPorts=1,
    use_p_in=false,
    p(displayUnit="Pa") = 101325,
    T=303.15);
  Buildings.Fluid.Sources.Boundary_pT sou_2(
    redeclare package Medium = Medium2,
    nPorts=1,
    T=T_a2_nominal,
    X={0.02,1 - 0.02},
    use_T_in=true,
    use_X_in=true,
    p(displayUnit="Pa") = 101325 + 300);
  Buildings.Fluid.Sources.Boundary_pT sin_1(
    redeclare package Medium = Medium1,
    nPorts=1,
    use_p_in=false,
    p=300000,
    T=293.15);
  Buildings.Fluid.Sources.Boundary_pT sou_1(
    redeclare package Medium = Medium1,
    nPorts=1,
    use_T_in=true,
    p=300000 + 12000);
  Fluid.FixedResistances.FixedResistanceDpM res_2(
    from_dp=true,
    redeclare package Medium = Medium2,
    dp_nominal=100,
    m_flow_nominal=m2_flow_nominal);
  Fluid.FixedResistances.FixedResistanceDpM res_1(
    from_dp=true,
    redeclare package Medium = Medium1,
    dp_nominal=3000,
    m_flow_nominal=m1_flow_nominal);
  Buildings.Fluid.Sensors.TemperatureDryBulbDynamic temSen(redeclare package
      Medium = Medium2, m_flow_nominal=m2_flow_nominal);
  Buildings.Fluid.Actuators.Valves.TwoWayEqualPercentage val(
    redeclare package Medium = Medium1,
    m_flow_nominal=m1_flow_nominal) "Valve model";
  Modelica.Blocks.Sources.TimeTable TSet(table=[0,288.15; 600,288.15; 600,
        298.15; 1200,298.15; 1800,283.15; 2400,283.15; 2400,288.15]) 
    "Setpoint temperature";
  Buildings.Fluid.HeatExchangers.WetCoilCounterFlow hex(
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    m1_flow_nominal=m1_flow_nominal,
    m2_flow_nominal=m2_flow_nominal,
    dp2_nominal(displayUnit="Pa") = 200,
    allowFlowReversal1=true,
    allowFlowReversal2=true,
    dp1_nominal(displayUnit="Pa") = 3000,
    UA_nominal=m1_flow_nominal*4200*(T_a1_nominal - T_b1_nominal)/
      Buildings.Fluid.HeatExchangers.BaseClasses.lmtd(
        T_a1_nominal,
        T_b1_nominal,
        T_a2_nominal,
        T_b2_nominal));

  inner Modelica.Fluid.System system;
  Modelica.Blocks.Sources.Constant const(k=0.8);
  Buildings.Utilities.Psychrometrics.X_pTphi x_pTphi(use_p_in=false, redeclare 
      package Medium = Medium2);
  Modelica.Blocks.Sources.Constant const1(k=T_a2_nominal);
  Buildings.Controls.Continuous.LimPID limPID(
    Ti=1,
    Td=1,
    reverseAction=true,
    yMin=0,
    controllerType=Modelica.Blocks.Types.SimpleController.PI);
  Buildings.Fluid.Sensors.RelativeHumidity senRelHum(redeclare package Medium
      = Medium2);
  Modelica.Blocks.Sources.Ramp TWat(
    height=30,
    offset=T_a1_nominal,
    startTime=300,
    duration=2000) "Water temperature, raised to high value at t=3000 s";
equation 
  connect(hex.port_b1, res_1.port_a);
  connect(val.port_b, hex.port_a1);
  connect(sou_1.ports[1], val.port_a);
  connect(sin_1.ports[1], res_1.port_b);
  connect(sin_2.ports[1], res_2.port_b);
  connect(sou_2.ports[1], hex.port_a2);
  connect(hex.port_b2, temSen.port_a);
  connect(temSen.port_b, res_2.port_a);
  connect(x_pTphi.X, sou_2.X_in);
  connect(const.y, x_pTphi.phi);
  connect(const1.y, x_pTphi.T);
  connect(const1.y, sou_2.T_in);
  connect(TSet.y, limPID.u_s);
  connect(temSen.T, limPID.u_m);
  connect(senRelHum.port, hex.port_b2);
  connect(TWat.y, sou_1.T_in);
  connect(limPID.y, val.y);
end WetCoilCounterFlowPControl;







Buildings.Fluid.HeatExchangers.Examples.DryCoilDiscretized

Model that demonstrates use of a finite volume model of a heat exchanger without condensation

Buildings.Fluid.HeatExchangers.Examples.DryCoilDiscretized

Parameters




TypeNameDefaultDescription


TemperatureT_a1_nominal60 + 273.15[K]


TemperatureT_b1_nominal40 + 273.15[K]


TemperatureT_a2_nominal5 + 273.15[K]


TemperatureT_b2_nominal20 + 273.15[K]


MassFlowRatem1_flow_nominal5Nominal mass flow rate medium 1 [kg/s]


MassFlowRatem2_flow_nominalm1_flow_nominal*4200/1000*(T...Nominal mass flow rate medium 2 [kg/s]




Modelica definition


model DryCoilDiscretized 
  "Model that demonstrates use of a finite volume model of a heat exchanger without condensation"
 package Medium1 = Buildings.Media.ConstantPropertyLiquidWater;
 package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAirUnsaturated;

  parameter Modelica.SIunits.Temperature T_a1_nominal = 60+273.15;
  parameter Modelica.SIunits.Temperature T_b1_nominal = 40+273.15;
  parameter Modelica.SIunits.Temperature T_a2_nominal =  5+273.15;
  parameter Modelica.SIunits.Temperature T_b2_nominal = 20+273.15;
  parameter Modelica.SIunits.MassFlowRate m1_flow_nominal = 5 
    "Nominal mass flow rate medium 1";
  parameter Modelica.SIunits.MassFlowRate m2_flow_nominal = m1_flow_nominal*4200/1000*(T_a1_nominal-T_b1_nominal)/(T_b2_nominal-T_a2_nominal) 
    "Nominal mass flow rate medium 2";

  Buildings.Fluid.HeatExchangers.DryCoilDiscretized hex(
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    nPipPar=1,
    nPipSeg=3,
    nReg=2,
    m1_flow_nominal=m1_flow_nominal,
    m2_flow_nominal=m2_flow_nominal,
    UA_nominal=m1_flow_nominal*4200*(T_a1_nominal-T_b1_nominal)/
      Buildings.Fluid.HeatExchangers.BaseClasses.lmtd(
        T_a1_nominal,
        T_b1_nominal,
        T_a2_nominal,
        T_b2_nominal),
    dp2_nominal=200,
    dp1_nominal=5000);
  Buildings.Fluid.Sources.Boundary_pT sin_2(                       redeclare 
      package Medium = Medium2, T=303.15,
    use_p_in=true,
    nPorts=1);
    Modelica.Blocks.Sources.Ramp PIn(
    offset=101525,
    height=-199,
    duration=60,
    startTime=120);
  Buildings.Fluid.Sources.Boundary_pT sou_2(                       redeclare 
      package Medium = Medium2,
    use_p_in=true,
    use_T_in=true,
    T=283.15,
    nPorts=1);
    Modelica.Blocks.Sources.Ramp TWat(
    duration=60,
    startTime=60,
    height=5,
    offset=273.15 + 60) "Water temperature";
  Modelica.Blocks.Sources.Constant TDb(k=273.15 + 5) "Drybulb temperature";
    Modelica.Blocks.Sources.Constant POut(k=101325);
  Buildings.Fluid.Sources.Boundary_pT sin_1(                       redeclare 
      package Medium = Medium1,
    p=300000,
    T=293.15,
    use_p_in=true,
    nPorts=1);
  Buildings.Fluid.Sources.Boundary_pT sou_1(
    redeclare package Medium = Medium1,
    p=300000 + 5000,
    use_T_in=true,
    T=293.15,
    nPorts=1);
    Modelica.Blocks.Sources.Ramp PSin_1(
    startTime=240,
    offset=300000,
    height=4990,
    duration=60);
  inner Modelica.Fluid.System system;
equation 
  connect(PIn.y,sou_2. p_in);
  connect(TDb.y, sou_2.T_in);
  connect(TWat.y, sou_1.T_in);
  connect(PSin_1.y, sin_1.p_in);
  connect(sou_1.ports[1], hex.port_a1);
  connect(sou_2.ports[1], hex.port_a2);
  connect(POut.y, sin_2.p_in);
  connect(sin_2.ports[1], hex.port_b2);
  connect(hex.port_b1, sin_1.ports[1]);
end DryCoilDiscretized;







Buildings.Fluid.HeatExchangers.Examples.WetCoilDiscretized

Model that demonstrates use of a finite volume model of a heat exchanger with condensation

Buildings.Fluid.HeatExchangers.Examples.WetCoilDiscretized

Parameters




TypeNameDefaultDescription


TemperatureT_a1_nominal5 + 273.15[K]


TemperatureT_b1_nominal10 + 273.15[K]


TemperatureT_a2_nominal30 + 273.15[K]


TemperatureT_b2_nominal10 + 273.15[K]


MassFlowRatem1_flow_nominal5Nominal mass flow rate medium 1 [kg/s]


MassFlowRatem2_flow_nominalm1_flow_nominal*4200/1000*(T...Nominal mass flow rate medium 2 [kg/s]




Modelica definition


model WetCoilDiscretized 
  "Model that demonstrates use of a finite volume model of a heat exchanger with condensation"
  import Buildings;

 package Medium1 = Buildings.Media.ConstantPropertyLiquidWater;
 // package Medium2 = Buildings.Media.PerfectGases.MoistAir;
 // package Medium2 = Buildings.Media.PerfectGases.MoistAirUnsaturated;
 // package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAir;
  package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAirUnsaturated;
  parameter Modelica.SIunits.Temperature T_a1_nominal = 5+273.15;
  parameter Modelica.SIunits.Temperature T_b1_nominal = 10+273.15;
  parameter Modelica.SIunits.Temperature T_a2_nominal = 30+273.15;
  parameter Modelica.SIunits.Temperature T_b2_nominal = 10+273.15;
  parameter Modelica.SIunits.MassFlowRate m1_flow_nominal = 5 
    "Nominal mass flow rate medium 1";
  parameter Modelica.SIunits.MassFlowRate m2_flow_nominal = m1_flow_nominal*4200/1000*(T_a1_nominal-T_b1_nominal)/(T_b2_nominal-T_a2_nominal) 
    "Nominal mass flow rate medium 2";

  Buildings.Fluid.HeatExchangers.WetCoilDiscretized hex(
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    m1_flow_nominal=m1_flow_nominal,
    m2_flow_nominal=m2_flow_nominal,
    dp2_nominal(displayUnit="Pa") = 200,
    nPipPar=1,
    nPipSeg=3,
    nReg=2,
    dp1_nominal(displayUnit="Pa") = 5000,
    UA_nominal=m1_flow_nominal*4200*(T_a1_nominal - T_b1_nominal)/
        Buildings.Fluid.HeatExchangers.BaseClasses.lmtd(
        T_a1_nominal,
        T_b1_nominal,
        T_a2_nominal,
        T_b2_nominal));
  Buildings.Fluid.Sources.Boundary_pT sin_2(                       redeclare 
      package Medium = Medium2,
    use_p_in=false,
    p=101325,
    T=303.15,
    nPorts=1);
    Modelica.Blocks.Sources.Ramp PIn(
    duration=60,
    height=-200,
    startTime=120,
    offset=101525);
  Buildings.Fluid.Sources.Boundary_pT sou_2(                       redeclare 
      package Medium = Medium2,
    use_p_in=true,
    nPorts=1,
    use_T_in=false,
    T=293.15);
    Modelica.Blocks.Sources.Ramp TWat(
    duration=60,
    height=15,
    offset=273.15 + 5,
    startTime=120) "Water temperature";
  Buildings.Fluid.Sources.Boundary_pT sin_1(                       redeclare 
      package Medium = Medium1,
    p=300000,
    T=293.15,
    use_p_in=true,
    nPorts=1);
  Buildings.Fluid.Sources.Boundary_pT sou_1(
    redeclare package Medium = Medium1,
    p=300000 + 5000,
    use_T_in=true,
    T=293.15,
    nPorts=1);
    Modelica.Blocks.Sources.Ramp PSin_1(
    duration=60,
    height=5000,
    startTime=240,
    offset=300000);
  inner Modelica.Fluid.System system;
equation 
  connect(TWat.y, sou_1.T_in);
  connect(PSin_1.y, sin_1.p_in);
  connect(sou_1.ports[1], hex.port_a1);
  connect(sou_2.ports[1], hex.port_a2);
  connect(PIn.y, sou_2.p_in);
  connect(hex.port_b1, sin_1.ports[1]);
  connect(hex.port_b2, sin_2.ports[1]);
end WetCoilDiscretized;







Buildings.Fluid.HeatExchangers.Examples.DryCoilDiscretizedPControl

Model that demonstrates use of a finite volume model of a heat exchanger without condensation and with feedback control

Buildings.Fluid.HeatExchangers.Examples.DryCoilDiscretizedPControl

Parameters




TypeNameDefaultDescription


TemperatureT_a1_nominal60 + 273.15[K]


TemperatureT_b1_nominal50 + 273.15[K]


TemperatureT_a2_nominal20 + 273.15[K]


TemperatureT_b2_nominal40 + 273.15[K]


MassFlowRatem1_flow_nominal5Nominal mass flow rate medium 1 [kg/s]


MassFlowRatem2_flow_nominalm1_flow_nominal*4200/1000*(T...Nominal mass flow rate medium 2 [kg/s]




Modelica definition


model DryCoilDiscretizedPControl 
  "Model that demonstrates use of a finite volume model of a heat exchanger without condensation and with feedback control"
  import Buildings;

 package Medium1 = Buildings.Media.ConstantPropertyLiquidWater;
 //package Medium2 = Buildings.Media.PerfectGases.MoistAir;
 //package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAir;
 // package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAirUnsaturated;
 package Medium2 = Buildings.Media.GasesPTDecoupled.SimpleAir;
  parameter Modelica.SIunits.Temperature T_a1_nominal = 60+273.15;
  parameter Modelica.SIunits.Temperature T_b1_nominal = 50+273.15;
  parameter Modelica.SIunits.Temperature T_a2_nominal = 20+273.15;
  parameter Modelica.SIunits.Temperature T_b2_nominal = 40+273.15;
  parameter Modelica.SIunits.MassFlowRate m1_flow_nominal = 5 
    "Nominal mass flow rate medium 1";
  parameter Modelica.SIunits.MassFlowRate m2_flow_nominal = m1_flow_nominal*4200/1000*(T_a1_nominal-T_b1_nominal)/(T_b2_nominal-T_a2_nominal) 
    "Nominal mass flow rate medium 2";

  Buildings.Fluid.Sources.Boundary_pT sin_2(                       redeclare 
      package Medium = Medium2,
    nPorts=1,
    use_p_in=false,
    p(displayUnit="Pa") = 101325,
    T=303.15);
  Buildings.Fluid.Sources.Boundary_pT sou_2(                       redeclare 
      package Medium = Medium2,
    nPorts=1,
    use_p_in=false,
    use_T_in=false,
    p(displayUnit="Pa") = 101625,
    T=T_a2_nominal);
  Buildings.Fluid.Sources.Boundary_pT sin_1(                       redeclare 
      package Medium = Medium1,
    p=300000,
    T=293.15,
    nPorts=1,
    use_p_in=true);
  Buildings.Fluid.Sources.Boundary_pT sou_1(
    redeclare package Medium = Medium1,
    p=300000 + 9000,
    nPorts=1,
    use_T_in=false,
    T=T_a1_nominal);
    Fluid.FixedResistances.FixedResistanceDpM res_2(
    from_dp=true,
    redeclare package Medium = Medium2,
    dp_nominal=100,
    m_flow_nominal=m2_flow_nominal);
    Fluid.FixedResistances.FixedResistanceDpM res_1(
    from_dp=true,
    redeclare package Medium = Medium1,
    m_flow_nominal=5,
    dp_nominal=3000);
    Modelica.Blocks.Sources.Ramp PSin_1(
    duration=60,
    height=5000,
    startTime=240,
    offset=300000);
  Buildings.Fluid.Sensors.TemperatureTwoPort temSen(redeclare package Medium =
        Medium2);
  Buildings.Fluid.Actuators.Valves.TwoWayEqualPercentage val(
    redeclare package Medium = Medium1,
    l=0.005,
    Kv_SI=5/sqrt(4000),
    m_flow_nominal=m1_flow_nominal) "Valve model";
  Modelica.Blocks.Sources.TimeTable TSet(table=[0,298.15; 600,298.15; 600,
        303.15; 1200,303.15; 1800,298.15; 2400,298.15; 2400,304.15]) 
    "Setpoint temperature";
  Buildings.Fluid.HeatExchangers.DryCoilDiscretized hex(
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    nPipPar=1,
    nPipSeg=3,
    nReg=4,
    m1_flow_nominal=m1_flow_nominal,
    m2_flow_nominal=m2_flow_nominal,
    UA_nominal=m1_flow_nominal*4200*(T_a1_nominal-T_b1_nominal)/
      Buildings.Fluid.HeatExchangers.BaseClasses.lmtd(
        T_a1_nominal,
        T_b1_nominal,
        T_a2_nominal,
        T_b2_nominal),
    dp1_nominal(displayUnit="Pa") = 2000,
    dp2_nominal(displayUnit="Pa") = 200);
  Buildings.Fluid.Actuators.Motors.IdealMotor mot(tOpe=60) "Motor model";
  inner Modelica.Fluid.System system;
  Buildings.Controls.Continuous.LimPID P(
                              k=1,
    Ti=60,
    controllerType=Modelica.Blocks.Types.SimpleController.P,
    Td=60);
equation 
  connect(PSin_1.y, sin_1.p_in);
  connect(hex.port_b1, res_1.port_a);
  connect(val.port_b, hex.port_a1);
  connect(sou_1.ports[1], val.port_a);
  connect(sin_1.ports[1], res_1.port_b);
  connect(sin_2.ports[1], res_2.port_b);
  connect(sou_2.ports[1], hex.port_a2);
  connect(mot.y, val.y);
  connect(hex.port_b2, temSen.port_a);
  connect(temSen.port_b, res_2.port_a);
  connect(TSet.y, P.u_s);
  connect(temSen.T, P.u_m);
  connect(P.y, mot.u);
end DryCoilDiscretizedPControl;







Buildings.Fluid.HeatExchangers.Examples.WetCoilDiscretizedPControl

Model that demonstrates use of a finite volume model of a heat exchanger with condensation and feedback control

Buildings.Fluid.HeatExchangers.Examples.WetCoilDiscretizedPControl

Parameters




TypeNameDefaultDescription


TemperatureT_a1_nominal5 + 273.15[K]


TemperatureT_b1_nominal10 + 273.15[K]


TemperatureT_a2_nominal30 + 273.15[K]


TemperatureT_b2_nominal10 + 273.15[K]


MassFlowRatem1_flow_nominal5Nominal mass flow rate medium 1 [kg/s]


MassFlowRatem2_flow_nominalm1_flow_nominal*4200/1000*(T...Nominal mass flow rate medium 2 [kg/s]




Modelica definition


model WetCoilDiscretizedPControl 
  "Model that demonstrates use of a finite volume model of a heat exchanger with condensation and feedback control"
  import Buildings;

 package Medium1 = Buildings.Media.ConstantPropertyLiquidWater;
 //package Medium2 = Buildings.Media.PerfectGases.MoistAir;
 //package Medium2 = Modelica.Media.Air.MoistAir;
 //package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAir;
 // package Medium2 = Buildings.Media.PerfectGases.MoistAirUnsaturated;
 //package Medium2 = Buildings.Media.PerfectGases.MoistAir;
  package Medium2 = Buildings.Media.GasesConstantDensity.MoistAirUnsaturated;

  parameter Modelica.SIunits.Temperature T_a1_nominal = 5+273.15;
  parameter Modelica.SIunits.Temperature T_b1_nominal = 10+273.15;
  parameter Modelica.SIunits.Temperature T_a2_nominal = 30+273.15;
  parameter Modelica.SIunits.Temperature T_b2_nominal = 10+273.15;
  parameter Modelica.SIunits.MassFlowRate m1_flow_nominal = 5 
    "Nominal mass flow rate medium 1";
  parameter Modelica.SIunits.MassFlowRate m2_flow_nominal = m1_flow_nominal*4200/1000*(T_a1_nominal-T_b1_nominal)/(T_b2_nominal-T_a2_nominal) 
    "Nominal mass flow rate medium 2";

 Buildings.Fluid.Sources.Boundary_pT sin_2(                       redeclare 
      package Medium = Medium2,
    use_p_in=false,
    p=101325,
    T=303.15,
    nPorts=1);
  Buildings.Fluid.Sources.Boundary_pT sou_2(                       redeclare 
      package Medium = Medium2,
    nPorts=1,
    use_p_in=false,
    use_T_in=true,
    p(displayUnit="Pa") = 101525,
    T=293.15);
  Buildings.Fluid.Sources.Boundary_pT sin_1(                       redeclare 
      package Medium = Medium1,
    p=300000,
    T=293.15,
    use_p_in=true,
    nPorts=1);
  Buildings.Fluid.Sources.Boundary_pT sou_1(
    redeclare package Medium = Medium1,
    nPorts=1,
    use_T_in=true,
    p=300000 + 7000,
    T=278.15);
    Modelica.Blocks.Sources.Ramp PSin(
    duration=60,
    height=5000,
    startTime=240,
    offset=300000);
  Buildings.Fluid.Sensors.TemperatureTwoPort temSen(redeclare package Medium =
        Medium2);
  Buildings.Fluid.Actuators.Valves.TwoWayLinear val(
    redeclare package Medium = Medium1,
    Kv_SI=m1_flow_nominal/sqrt(5000),
    m_flow_nominal=m1_flow_nominal);
  Modelica.Blocks.Sources.TimeTable TSet(table=[0,293.15; 600,293.15; 600,
        288.15; 1200,288.15; 1800,288.15; 2400,295.15; 2400,295.15]) 
    "Setpoint temperature";
  Buildings.Fluid.HeatExchangers.WetCoilDiscretized hex(
    redeclare package Medium1 = Medium1,
    redeclare package Medium2 = Medium2,
    nPipPar=1,
    nPipSeg=3,
    nReg=4,
    m1_flow_nominal=m1_flow_nominal,
    m2_flow_nominal=m2_flow_nominal,
    UA_nominal=m1_flow_nominal*4200*(T_a1_nominal-T_b1_nominal)/
     Buildings.Fluid.HeatExchangers.BaseClasses.lmtd(
        T_a1_nominal,
        T_b1_nominal,
        T_a2_nominal,
        T_b2_nominal),
    dp1_nominal(displayUnit="Pa") = 2000,
    dp2_nominal(displayUnit="Pa") = 200);
  inner Modelica.Fluid.System system;
  Modelica.Blocks.Sources.Step TSou_2(
    startTime=3000,
    offset=T_a2_nominal,
    height=-3);
  Modelica.Blocks.Sources.Step TSou_1(
    startTime=3000,
    height=10,
    offset=T_a1_nominal);
  Buildings.Controls.Continuous.LimPID P1(
                              k=1,
    Ti=60,
    controllerType=Modelica.Blocks.Types.SimpleController.P,
    Td=60,
    reverseAction=true);
  Buildings.Fluid.Actuators.Motors.IdealMotor mot(tOpe=60) "Motor model";
equation 
  connect(PSin.y, sin_1.p_in);
  connect(sou_2.ports[1], hex.port_a2);
  connect(hex.port_b2, temSen.port_a);
  connect(val.port_b, hex.port_a1);
  connect(sou_1.ports[1], val.port_a);
  connect(TSou_2.y, sou_2.T_in);
  connect(TSou_1.y, sou_1.T_in);
  connect(TSet.y, P1.u_s);
  connect(temSen.T, P1.u_m);
  connect(P1.y, mot.u);
  connect(mot.y, val.y);
  connect(sin_2.ports[1], temSen.port_b);
  connect(hex.port_b1, sin_1.ports[1]);
end WetCoilDiscretizedPControl;





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