Buildings.Utilities.Psychrometrics.Examples

Information

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

Package Content

Name	Description
DewPointTemperature	Unit test for dew point temperature calculation
HumidityRatioPressure	Unit test for humidity ratio model
MassFraction_pTphi	Unit test for dew point temperature calculation
TotalAirDryAir	Unit test for conversion of humidity per total air and dry air mass
TWetBul_TDryBulPhi	Model to test the wet bulb temperature computation
TWetBul_TDryBulXi
WetBul_pTX	Model to test the wet bulb temperature computation

Buildings.Utilities.Psychrometrics.Examples.DewPointTemperature

Information

Modelica definition

model DewPointTemperature 
  "Unit test for dew point temperature calculation"
  extends Modelica.Icons.Example;
   package Medium = Buildings.Media.PerfectGases.MoistAir "Medium model";
  Buildings.Utilities.Psychrometrics.pW_TDewPoi watVapPre;
    Modelica.Blocks.Sources.Ramp XHum(
    duration=1,
    height=(0.01 - 0.1),
    offset=0.1) "Humidity concentration";
  Buildings.Utilities.Psychrometrics.pW_X humRat(
                         use_p_in=false);
  Buildings.Utilities.Psychrometrics.TDewPoi_pW TDewPoi;
equation 
  connect(XHum.y, humRat.X_w);
  connect(humRat.p_w, TDewPoi.p_w);
  connect(TDewPoi.T, watVapPre.T);
end DewPointTemperature;

Buildings.Utilities.Psychrometrics.Examples.HumidityRatioPressure

Information

Modelica definition

model HumidityRatioPressure "Unit test for humidity ratio model"
  extends Modelica.Icons.Example;
 package Medium = Buildings.Media.PerfectGases.MoistAir "Medium model";
  Buildings.Utilities.Psychrometrics.pW_X vapPre(
                         use_p_in=true) "Model for humidity ratio";
    Modelica.Blocks.Sources.Ramp XHumDryAir(
    duration=1,
    height=(0.0133 - 0.2),
    offset=0.2) "Humidity concentration in [kg/kg dry air]";
  Modelica.Blocks.Sources.Constant p(k=101325) "Pressure";
  Buildings.Utilities.Psychrometrics.X_pW humRat(
                            use_p_in=true);
  Diagnostics.AssertEquality assertEquality(threShold=1E-5) 
    "Checks that model and its inverse implementation are correct";
  ToTotalAir toTotalAir;
equation 
  connect(vapPre.p_w, humRat.p_w);
  connect(humRat.X_w, assertEquality.u1);
  connect(p.y, humRat.p_in);
  connect(p.y, vapPre.p_in);
  connect(XHumDryAir.y, toTotalAir.XiDry);
  connect(toTotalAir.XiTotalAir, vapPre.X_w);
  connect(toTotalAir.XiTotalAir, assertEquality.u2);
end HumidityRatioPressure;

Buildings.Utilities.Psychrometrics.Examples.MassFraction_pTphi

Information

Modelica definition

model MassFraction_pTphi 
  "Unit test for dew point temperature calculation"
  extends Modelica.Icons.Example;

   package Medium1 = Buildings.Media.PerfectGases.MoistAir "Medium model";
   package Medium2 = Buildings.Media.GasesPTDecoupled.MoistAir "Medium model";
    Modelica.Blocks.Sources.Ramp Phi(
    offset=0,
    duration=0.5,
    height=1) "Relative humidity";
  Buildings.Utilities.Psychrometrics.X_pTphi masFra1 
    "Mass fraction computation";
    Modelica.Blocks.Sources.Ramp T(
    height=10,
    offset=283.15,
    duration=0.5,
    startTime=0.5) "Temperature";
    Modelica.Blocks.Sources.Constant P(k=101325) "Pressure";
  Buildings.Utilities.Psychrometrics.X_pTphi masFra2(use_p_in=false) 
    "Mass fraction computation";
equation 
  connect(T.y, masFra1.T);
  connect(Phi.y, masFra1.phi);
  connect(T.y, masFra2.T);
  connect(Phi.y, masFra2.phi);
  connect(P.y, masFra1.p_in);
end MassFraction_pTphi;

Buildings.Utilities.Psychrometrics.Examples.TotalAirDryAir

Information

Modelica definition

model TotalAirDryAir 
  "Unit test for conversion of humidity per total air and dry air mass"
  extends Modelica.Icons.Example;
   package Medium = Buildings.Media.PerfectGases.MoistAir "Medium model";
    Modelica.Blocks.Sources.Ramp XHum(
    duration=1,
    height=(0.01 - 0.1),
    offset=0.1) "Humidity concentration";
  ToTotalAir toTotalAir;
  ToDryAir toDryAir;
  Diagnostics.AssertEquality assertEquality(threShold=1E-5) 
    "Checks that model and its inverse implementation are correct";
equation 
  connect(toTotalAir.XiDry, XHum.y);
  connect(toTotalAir.XiTotalAir, toDryAir.XiTotalAir);
  connect(toDryAir.XiDry, assertEquality.u1);
  connect(assertEquality.u2, XHum.y);
end TotalAirDryAir;

Buildings.Utilities.Psychrometrics.Examples.TWetBul_TDryBulPhi

Information

Modelica definition

model TWetBul_TDryBulPhi 
  "Model to test the wet bulb temperature computation"
  extends Modelica.Icons.Example;

 package Medium = Buildings.Media.PerfectGases.MoistAirUnsaturated 
    "Medium model";

  Buildings.Utilities.Psychrometrics.TWetBul_TDryBulPhi wetBulPhi(redeclare 
      package Medium = Medium) "Model for wet bulb temperature";
  Modelica.Blocks.Sources.Constant p(k=101325) "Pressure";
    Modelica.Blocks.Sources.Ramp phi(
    duration=1,
    height=0.98,
    offset=0.01) "Relative humidity";
  Modelica.Blocks.Sources.Constant TDryBul(k=283.15) "Dry bulb temperature";
  Buildings.Utilities.Psychrometrics.TWetBul_TDryBulPhi wetBulPhiApp(redeclare 
      package Medium = Medium, approximateWetBulb=true) 
    "Model for wet bulb temperature";
equation 
  connect(p.y, wetBulPhi.p);
  connect(TDryBul.y, wetBulPhi.TDryBul);
  connect(phi.y, wetBulPhi.phi);
  connect(p.y, wetBulPhiApp.p);
  connect(TDryBul.y, wetBulPhiApp.TDryBul);
  connect(phi.y, wetBulPhiApp.phi);
end TWetBul_TDryBulPhi;

Buildings.Utilities.Psychrometrics.Examples.TWetBul_TDryBulXi

Information

Modelica definition

model TWetBul_TDryBulXi
  extends Modelica.Icons.Example;

 package Medium = Buildings.Media.PerfectGases.MoistAir "Medium model";

    Modelica.Blocks.Sources.Ramp TDryBul(
    height=10,
    duration=1,
    offset=273.15 + 30) "Dry bulb temperature";
  Buildings.Utilities.Psychrometrics.TWetBul_TDryBulXi wetBul(         redeclare 
      package Medium = Medium) "Model for wet bulb temperature";
  Modelica.Blocks.Sources.Constant p(k=101325) "Pressure";
    Modelica.Blocks.Sources.Ramp XHum(
    duration=1,
    height=(0.0133 - 0.0175),
    offset=0.0175) "Humidity concentration";
  Buildings.Utilities.Psychrometrics.TWetBul_TDryBulXi wetBulApp(redeclare 
      package Medium = Medium, approximateWetBulb=true) 
    "Model for wet bulb temperature";
equation 
  connect(p.y, wetBul.p);
  connect(XHum.y, wetBul.Xi[1]);
  connect(TDryBul.y, wetBul.TDryBul);
  connect(p.y, wetBulApp.p);
  connect(XHum.y, wetBulApp.Xi[1]);
  connect(TDryBul.y, wetBulApp.TDryBul);
end TWetBul_TDryBulXi;

Buildings.Utilities.Psychrometrics.Examples.WetBul_pTX

Information

Modelica definition

model WetBul_pTX "Model to test the wet bulb temperature computation"
  extends Modelica.Icons.Example;

 package Medium = Buildings.Media.PerfectGases.MoistAirUnsaturated 
    "Medium model";

  Modelica.Blocks.Sources.Constant p(k=101325) "Pressure";
    Modelica.Blocks.Sources.Ramp XDryBul(
    duration=1,
    height=0.014,
    offset=0) "Dry bulb water vapor mass fraction";
  Modelica.Blocks.Sources.Constant TDryBul(k=293.15) "Dry bulb temperature";
  Buildings.Utilities.Psychrometrics.WetBul_pTX      wetBul_TDryBulX(redeclare 
      package Medium = Medium);
equation 
  connect(TDryBul.y, wetBul_TDryBulX.TDryBul);
  connect(XDryBul.y, wetBul_TDryBulX.XDryBul);
  connect(p.y, wetBul_TDryBulX.p);
end WetBul_pTX;