Buildings.Utilities.Psychrometrics.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.Utilities.Psychrometics.


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

Package Content




NameDescription


DewPointTemperature
Unit test for dew point temperature calculation


HumidityRatioPressure
Unit test for humidity ratio model


TotalAirDryAir
Unit test for conversion of humidity per total air and dry air mass


WetBulbTemperature
 








Buildings.Utilities.Psychrometrics.Examples.DewPointTemperature

Unit test for dew point temperature calculation

Buildings.Utilities.Psychrometrics.Examples.DewPointTemperature

Modelica definition


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







Buildings.Utilities.Psychrometrics.Examples.HumidityRatioPressure

Unit test for humidity ratio model

Buildings.Utilities.Psychrometrics.Examples.HumidityRatioPressure

Modelica definition


model HumidityRatioPressure "Unit test for humidity ratio model"
 package Medium = Buildings.Media.PerfectGases.MoistAir "Medium model";
  VaporPressure_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";
  HumidityRatio_pWat 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.XWat, assertEquality.u1);
  connect(p.y, humRat.p_in);
  connect(p.y, vapPre.p_in);
  connect(XHumDryAir.y, toTotalAir.XiDry);
  connect(toTotalAir.XiTotalAir, vapPre.XWat);
  connect(toTotalAir.XiTotalAir, assertEquality.u2);
end HumidityRatioPressure;







Buildings.Utilities.Psychrometrics.Examples.TotalAirDryAir

Unit test for conversion of humidity per total air and dry air mass

Buildings.Utilities.Psychrometrics.Examples.TotalAirDryAir

Modelica definition


model TotalAirDryAir 
  "Unit test for conversion of humidity per total air and dry air mass"
   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.WetBulbTemperature

Buildings.Utilities.Psychrometrics.Examples.WetBulbTemperature

Information



This examples is a unit test for the wet bulb computation.
The problem setup is such that the moisture concentration and
the dry bulb temperature are varied simultaneously so 
that the wet bulb temperature remains constant.
This wet bulb temperature is checked against a constant value with
an assert statement.
If this assert is triggered, then the model for the wet bulb computation
is broken (assuming that the inputs remained unchanged).




Modelica definition


model WetBulbTemperature


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

    Modelica.Blocks.Sources.Ramp TDB(
    height=10,
    duration=1,
    offset=273.15 + 30) "Dry bulb temperature";
  Buildings.Utilities.Diagnostics.AssertEquality assertEquality(startTime=0,
      threShold=0.05);
  Modelica.Blocks.Sources.Constant TWBExp(k=273.15 + 25) 
    "Expected wet bulb temperature";
  Buildings.Utilities.Psychrometrics.WetBulbTemperature 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";
equation 
  connect(TWBExp.y, assertEquality.u2);
  connect(TDB.y, wetBul.TDryBul);
  connect(p.y, wetBul.p);
  connect(wetBul.TWetBul, assertEquality.u1);
  connect(XHum.y, wetBul.Xi[1]);
end WetBulbTemperature;





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