Buildings.Media.Antifreeze.Validation.BaseClasses
Package with base classes for Buildings.Media.Antifreeze.Validation
Information
This package contains base classes that are used to construct the models in Buildings.Media.Antifreeze.Validation.
Extends from Modelica.Icons.BasesPackage (Icon for packages containing base classes).
Package Content
| Name | Description |
|---|---|
 FluidProperties
|
Model that tests the implementation of temperature- and concentration-dependent fluid properties |
Buildings.Media.Antifreeze.Validation.BaseClasses.FluidProperties
Model that tests the implementation of temperature- and concentration-dependent fluid properties
Information
This example checks the implementation of functions that evaluate the temperature- and concentration-dependent thermophysical properties of the medium.
Thermophysical properties (density, specific heat capacity, thermal conductivity and dynamic viscosity) are shown as 0 if the temperature is below the fusion temperature.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| replaceable package Medium | Buildings.Media.Antifreeze.F... | Package with medium functions | |
| Integer | nX_a | Number of mass fractions to evaluate fluid properties | |
| MassFraction | X_a[nX_a] | Mass fraction of additive [1] | |
| Temperature | T_min | Minimum temperature of mixture [K] | |
| Temperature | T_max | Maximum temperature of mixture [K] | |
Connectors
| Type | Name | Description |
|---|---|---|
| replaceable package Medium | Package with medium functions | |
Modelica definition
model FluidProperties
"Model that tests the implementation of temperature- and concentration-dependent fluid properties"
replaceable package Medium =
Buildings.Media.Antifreeze.Functions.EthyleneGlycolWater
"Package with medium functions";
parameter Integer nX_a
"Number of mass fractions to evaluate fluid properties";
parameter Modelica.Units.SI.MassFraction X_a[nX_a]
"Mass fraction of additive";
parameter Modelica.Units.SI.Temperature T_min
"Minimum temperature of mixture";
parameter Modelica.Units.SI.Temperature T_max
"Maximum temperature of mixture";
Modelica.Units.SI.Temperature Tf[nX_a] "Fluid temperature";
Modelica.Units.SI.Density d[nX_a] "Density of fluid mixture";
Modelica.Units.SI.SpecificHeatCapacity cp[nX_a]
"Specific heat capacity of fluid mixture";
Modelica.Units.SI.ThermalConductivity lambda[nX_a] "Density of fluid mixture";
Modelica.Units.SI.DynamicViscosity eta[nX_a]
"Dynamic viscosity of fluid mixture";
Modelica.Units.SI.Temperature T "Temperature of fluid mixture";
Modelica.Units.NonSI.Temperature_degC T_degC "Celsius temperature";
protected
parameter Modelica.Units.SI.Time dt=1 "Simulation length";
parameter Real convT(unit="K/s") = (T_max-T_min)/dt
"Rate of temperature change";
equation
T = T_min + convT*time;
T_degC =Modelica.Units.Conversions.to_degC(T);
for i in 1:nX_a loop
Tf[i] =Medium.fusionTemperature_TX_a(T=T, X_a=X_a[i]);
d[i] =if T >= Tf[i] then Medium.density_TX_a(T=T, X_a=X_a[i]) else 0.;
cp[i] =if T >= Tf[i] then Medium.specificHeatCapacityCp_TX_a(T=T, X_a=X_a[i])
else 0.;
lambda[i] =if T >= Tf[i] then Medium.thermalConductivity_TX_a(T=T, X_a=X_a[i]) else 0.;
eta[i] =if T >= Tf[i] then Medium.dynamicViscosity_TX_a(T=T, X_a=X_a[i])
else 0.;
end for;
end FluidProperties;