partial model FluidProperties "Model that tests the implementation of the fluid properties" extends PartialProperties; Medium.ThermodynamicState state_phX "Medium state"; Medium.ThermodynamicState state_psX "Medium state"; Modelica.Media.Interfaces.Types.DerDensityByPressure ddpT "Density derivative w.r.t. pressure"; Modelica.Media.Interfaces.Types.DerDensityByTemperature ddTp "Density derivative w.r.t. temperature"; Modelica.Units.SI.Density[Medium.nX] dddX "Density derivative w.r.t. mass fraction"; equation // Check setting the states state_pTX = Medium.setState_pTX(p=p, T=T, X=X); state_phX = Medium.setState_phX(p=p, h=h, X=X); state_psX = Medium.setState_psX(p=p, s=s, X=X); checkState(state_pTX, state_phX, errAbs, "state_phX"); checkState(state_pTX, state_psX, errAbs, "state_psX"); // Check the implementation of the functions ddpT = Medium.density_derp_T(state_pTX); ddTp = Medium.density_derT_p(state_pTX); dddX = Medium.density_derX(state_pTX); end FluidProperties;

partial model PartialProperties "Partial model that contains common parameters of the fluid properties" replaceable package Medium = Modelica.Media.Interfaces.PartialMedium; parameter Modelica.Units.SI.Temperature TMin "Minimum temperature for the simulation"; parameter Modelica.Units.SI.Temperature TMax "Maximum temperature for the simulation"; parameter Modelica.Units.SI.Pressure p=Medium.p_default "Pressure"; parameter Modelica.Units.SI.MassFraction X[Medium.nX]=Medium.X_default "Mass fraction"; parameter Real errAbs=1E-8 "Absolute error used in the check of the state calculations"; Medium.Temperature T "Temperature"; Modelica.Units.NonSI.Temperature_degC T_degC "Celsius temperature"; Medium.ThermodynamicState state_pTX "Medium state"; Modelica.Units.SI.Density d "Density"; Modelica.Units.SI.DynamicViscosity eta "Dynamic viscosity"; Modelica.Units.SI.SpecificEnthalpy h "Specific enthalpy"; Modelica.Units.SI.SpecificInternalEnergy u "Specific internal energy"; Modelica.Units.SI.SpecificEntropy s "Specific entropy"; Modelica.Units.SI.SpecificEnergy g "Specific Gibbs energy"; Modelica.Units.SI.SpecificEnergy f "Specific Helmholtz energy"; Modelica.Units.SI.SpecificEnthalpy hIse "Isentropic enthalpy"; Modelica.Media.Interfaces.Types.IsobaricExpansionCoefficient beta "Isobaric expansion coefficient"; Modelica.Units.SI.IsothermalCompressibility kappa "Isothermal compressibility"; Modelica.Units.SI.SpecificHeatCapacity cp "Specific heat capacity"; Modelica.Units.SI.SpecificHeatCapacity cv "Specific heat capacity"; Modelica.Units.SI.ThermalConductivity lambda "Thermal conductivity"; Modelica.Units.SI.AbsolutePressure pMed "Pressure"; Medium.Temperature TMed "Temperature"; Modelica.Units.SI.MolarMass MM "Mixture molar mass"; Medium.BaseProperties basPro "Medium base properties"; protected constant Real conv(unit="1/s") = 1 "Conversion factor to satisfy unit check"; function checkState "This function checks the absolute error in the state calculations" extends Modelica.Icons.Function; input Medium.ThermodynamicState state1 "Medium state"; input Medium.ThermodynamicState state2 "Medium state"; input Real errAbs "Absolute error threshold"; input String message "Message for error reporting"; protected Real TErrAbs=abs(Medium.temperature(state1)-Medium.temperature(state2)) "Absolute error in temperature"; protected Real pErrAbs=abs(Medium.pressure(state1)-Medium.pressure(state2)) "Absolute error in pressure"; algorithm assert(TErrAbs < errAbs, "Absolute temperature error: " + String(TErrAbs) + " K. Error in temperature of " + message); assert(pErrAbs < errAbs, "Absolute pressure error: " + String(pErrAbs) + " Pa. Error in pressure of " + message); end checkState; equation // Compute temperatures that are used as input to the functions T = TMin + conv*time * (TMax-TMin); T_degC =Modelica.Units.Conversions.to_degC(T); // Check the implementation of the functions d = Medium.density(state_pTX); eta = Medium.dynamicViscosity(state_pTX); h = Medium.specificEnthalpy(state_pTX); u = Medium.specificInternalEnergy(state_pTX); s = Medium.specificEntropy(state_pTX); g = Medium.specificGibbsEnergy(state_pTX); f = Medium.specificHelmholtzEnergy(state_pTX); hIse = Medium.isentropicEnthalpy(p, state_pTX); beta = Medium.isobaricExpansionCoefficient(state_pTX); kappa = Medium.isothermalCompressibility(state_pTX); cp = Medium.specificHeatCapacityCp(state_pTX); cv = Medium.specificHeatCapacityCv(state_pTX); lambda = Medium.thermalConductivity(state_pTX); pMed = Medium.pressure(state_pTX); assert(abs(p-pMed) < errAbs, "Error in pressure computation."); TMed = Medium.temperature(state_pTX); assert(abs(T-TMed) < errAbs, "Error in temperature computation."); MM = Medium.molarMass(state_pTX); // Check the implementation of the base properties assert(abs(h-basPro.h) < errAbs, "Error in enthalpy computation in BaseProperties."); assert(abs(u-basPro.u) < errAbs, "Error in internal energy computation in BaseProperties."); end PartialProperties;

partial model TestTemperatureEnthalpyInversion "Model to check computation of h(T) and its inverse with a controlleable tolerance" replaceable package Medium = Modelica.Media.Interfaces.PartialMedium; parameter Modelica.Units.SI.Temperature T0=273.15 + 20 "Temperature"; parameter Real tol = 1E-8 "Numerical tolerance"; Modelica.Units.SI.Temperature T "Temperature"; Modelica.Units.SI.SpecificEnthalpy h "Enthalpy"; Medium.MassFraction Xi[:] = Medium.reference_X "Mass fraction"; equation h = Medium.specificEnthalpy_pTX(p=101325, T=T0, X=Xi); T = Medium.temperature_phX(p=101325, h=h, X=Xi); if (time>=0.1) then assert(abs(T-T0)<tol, "Error in implementation of functions.\n" + " T0 = " + String(T0) + "\n" + " T = " + String(T) + "\n" + " Absolute error: " + String(abs(T-T0)) + " K"); end if; end TestTemperatureEnthalpyInversion;