Buildings.Media.Specialized.Water.ConstantProperties_pT

Package with model for liquid water with constant properties at user-provided nominal conditions

Information

Model for liquid water with constant properties at given nominal conditions.

This water model is similar to Buildings.Media.Water with regard to its complexity. It also uses constant values for properties such as density and specific heat capacity. The main difference is that the constants T_nominal and p_nominal allow for user-provided nominal condition of the water model. The constant properties will be derived for this nominal condition. The maximum allowed temperature is set at the saturation temperature for the given nominal pressure p_nominal.

Assumptions and limitations

The nominal values for the constant medium properties are calculated using the Modelica.Media.Water.WaterIF97_base model.

Typical use and important parameters

A model using this medium model can set the nominal conditions e.g. by defining

  package Medium = Buildings.Media.Specialized.Water.ConstantProperties_pT(
    T_nominal=273.15+100,
    p_nominal=5e5);

Extends from Buildings.Media.Water (Package with model for liquid water with constant density).

Package Content

Name	Description
T_max_nominal=Modelica.Media.Water.IF97_Utilities.BaseIF97.Basic.tsat(p_nominal)	Maximum temperature valid for medium model
T_nominal=273.15 + 20	Nominal temperature for calculation of water properties
a_nominal=Modelica.Media.Water.IF97_Utilities.velocityOfSound_pT(p_nominal, T_nominal)	Constant velocity of sound
cp_nominal=Modelica.Media.Water.IF97_Utilities.cp_pT(p_nominal, T_nominal)	Specific heat capacity at nominal water conditions
d_nominal=Modelica.Media.Water.IF97_Utilities.rho_pT(p_nominal, T_nominal)	Density at nominal water conditions
eta_nominal=Modelica.Media.Water.IF97_Utilities.dynamicViscosity(d_nominal, T_nominal, p_nominal)	Constant dynamic viscosity
lambda_nominal=Modelica.Media.Water.IF97_Utilities.thermalConductivity(d_nominal, T_nominal, p_nominal)	Constant thermal conductivity
p_nominal=101325	Nominal pressure for calculation of water properties
Inherited
BaseProperties	Base properties
enthalpyOfLiquid	Return the specific enthalpy of liquid
simpleWaterConstants
cp_const=cp_nominal	Constant specific heat capacity at constant pressure
cv_const=cp_const	Constant specific heat capacity at constant volume
d_const=d_nominal	Constant density
eta_const=eta_nominal	Constant dynamic viscosity
lambda_const=lambda_nominal	Constant thermal conductivity
a_const=a_nominal	Constant velocity of sound
T_min=Cv.from_degC(-1)	Minimum temperature valid for medium model
T_max=T_max_nominal	Maximum temperature valid for medium model
T0=273.15	Zero enthalpy temperature
MM_const=0.018015268	Molar mass
fluidConstants=simpleWaterConstants	Fluid constants
ThermodynamicState	Thermodynamic state
setState_pTX	Return thermodynamic state from p, T, and X or Xi
setState_phX	Return thermodynamic state from p, h, and X or Xi
setState_psX	Return thermodynamic state from p, s, and X or Xi
setState_dTX	Return thermodynamic state from d, T, and X or Xi
setSmoothState	Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b
dynamicViscosity	Return dynamic viscosity
thermalConductivity	Return thermal conductivity
pressure	Return pressure
temperature	Return temperature
density	Return density
specificEnthalpy	Return specific enthalpy
specificHeatCapacityCp	Return specific heat capacity at constant pressure
specificHeatCapacityCv	Return specific heat capacity at constant volume
isentropicExponent	Return isentropic exponent
velocityOfSound	Return velocity of sound
specificEnthalpy_pTX	Return specific enthalpy from p, T, and X or Xi
temperature_phX	Return temperature from p, h, and X or Xi
density_phX	Return density from p, h, and X or Xi
specificInternalEnergy	Return specific internal energy
specificEntropy	Return specific entropy
specificGibbsEnergy	Return specific Gibbs energy
specificHelmholtzEnergy	Return specific Helmholtz energy
isentropicEnthalpy	Return isentropic enthalpy
isobaricExpansionCoefficient	Returns overall the isobaric expansion coefficient beta
isothermalCompressibility	Returns overall the isothermal compressibility factor
density_derp_T	Returns the partial derivative of density with respect to pressure at constant temperature
density_derT_p	Returns the partial derivative of density with respect to temperature at constant pressure
density_derX	Returns the partial derivative of density with respect to mass fractions at constant pressure and temperature
molarMass	Return the molar mass of the medium
setState_pT	Return thermodynamic state from p and T
setState_ph	Return thermodynamic state from p and h
setState_ps	Return thermodynamic state from p and s
setState_dT	Return thermodynamic state from d and T
density_ph	Return density from p and h
temperature_ph	Return temperature from p and h
pressure_dT	Return pressure from d and T
specificEnthalpy_dT	Return specific enthalpy from d and T
specificEnthalpy_ps	Return specific enthalpy from p and s
temperature_ps	Return temperature from p and s
density_ps	Return density from p and s
specificEnthalpy_pT	Return specific enthalpy from p and T
density_pT	Return density from p and T
ThermoStates=Modelica.Media.Interfaces.Choices.IndependentVariables.pT	Enumeration type for independent variables
mediumName="ConstantPropertyWater(p=" + String(p_nominal) + ",T=" + String(T_nominal) + ")"	Name of the medium
substanceNames={mediumName}	Names of the mixture substances. Set substanceNames={mediumName} if only one substance.
extraPropertiesNames=fill("", 0)	Names of the additional (extra) transported properties. Set extraPropertiesNames=fill("",0) if unused
singleState=true	= true, if u and d are not a function of pressure
reducedX=true	= true if medium contains the equation sum(X) = 1.0; set reducedX=true if only one substance (see docu for details)
fixedX=true	= true if medium contains the equation X = reference_X
reference_p=p_nominal	Reference pressure of Medium: default 1 atmosphere
reference_T=273.15	Reference temperature of Medium: default 25 deg Celsius
reference_X={1}	Default mass fractions of medium
p_default=p_nominal	Default value for pressure of medium (for initialization)
T_default=Modelica.SIunits.Conversions.from_degC(20)	Default value for temperature of medium (for initialization)
h_default=specificEnthalpy_pTX(p_default, T_default, X_default)	Default value for specific enthalpy of medium (for initialization)
X_default=reference_X	Default value for mass fractions of medium (for initialization)
nS=size(substanceNames, 1)	Number of substances
nX=nS	Number of mass fractions
nXi=if fixedX then 0 else if reducedX then nS - 1 else nS	Number of structurally independent mass fractions (see docu for details)
nC=size(extraPropertiesNames, 1)	Number of extra (outside of standard mass-balance) transported properties
C_nominal=1.0e-6*ones(nC)	Default for the nominal values for the extra properties
FluidConstants	Critical, triple, molecular and other standard data of fluid
prandtlNumber	Return the Prandtl number
heatCapacity_cp	Alias for deprecated name
heatCapacity_cv	Alias for deprecated name
beta	Alias for isobaricExpansionCoefficient for user convenience
kappa	Alias of isothermalCompressibility for user convenience
density_derp_h	Return density derivative w.r.t. pressure at const specific enthalpy
density_derh_p	Return density derivative w.r.t. specific enthalpy at constant pressure
specificEntropy_pTX	Return specific enthalpy from p, T, and X or Xi
density_pTX	Return density from p, T, and X or Xi
temperature_psX	Return temperature from p,s, and X or Xi
density_psX	Return density from p, s, and X or Xi
specificEnthalpy_psX	Return specific enthalpy from p, s, and X or Xi
MassFlowRate	Type for mass flow rate with medium specific attributes
AbsolutePressure	Type for absolute pressure with medium specific attributes
Density	Type for density with medium specific attributes
DynamicViscosity	Type for dynamic viscosity with medium specific attributes
EnthalpyFlowRate	Type for enthalpy flow rate with medium specific attributes
MassFraction	Type for mass fraction with medium specific attributes
MoleFraction	Type for mole fraction with medium specific attributes
MolarMass	Type for molar mass with medium specific attributes
MolarVolume	Type for molar volume with medium specific attributes
IsentropicExponent	Type for isentropic exponent with medium specific attributes
SpecificEnergy	Type for specific energy with medium specific attributes
SpecificInternalEnergy	Type for specific internal energy with medium specific attributes
SpecificEnthalpy	Type for specific enthalpy with medium specific attributes
SpecificEntropy	Type for specific entropy with medium specific attributes
SpecificHeatCapacity	Type for specific heat capacity with medium specific attributes
SurfaceTension	Type for surface tension with medium specific attributes
Temperature	Type for temperature with medium specific attributes
ThermalConductivity	Type for thermal conductivity with medium specific attributes
PrandtlNumber	Type for Prandtl number with medium specific attributes
VelocityOfSound	Type for velocity of sound with medium specific attributes
ExtraProperty	Type for unspecified, mass-specific property transported by flow
CumulativeExtraProperty	Type for conserved integral of unspecified, mass specific property
ExtraPropertyFlowRate	Type for flow rate of unspecified, mass-specific property
IsobaricExpansionCoefficient	Type for isobaric expansion coefficient with medium specific attributes
DipoleMoment	Type for dipole moment with medium specific attributes
DerDensityByPressure	Type for partial derivative of density with respect to pressure with medium specific attributes
DerDensityByEnthalpy	Type for partial derivative of density with respect to enthalpy with medium specific attributes
DerEnthalpyByPressure	Type for partial derivative of enthalpy with respect to pressure with medium specific attributes
DerDensityByTemperature	Type for partial derivative of density with respect to temperature with medium specific attributes
DerTemperatureByPressure	Type for partial derivative of temperature with respect to pressure with medium specific attributes
SaturationProperties	Saturation properties of two phase medium
FluidLimits	Validity limits for fluid model
FixedPhase	Phase of the fluid: 1 for 1-phase, 2 for two-phase, 0 for not known, e.g., interactive use
Basic	The most basic version of a record used in several degrees of detail
IdealGas	The ideal gas version of a record used in several degrees of detail
TwoPhase	The two phase fluid version of a record used in several degrees of detail

Types and constants

  constant Modelica.SIunits.Temperature T_max_nominal=
  Modelica.Media.Water.IF97_Utilities.BaseIF97.Basic.tsat(p_nominal)
    "Maximum temperature valid for medium model";

  constant Modelica.SIunits.Temperature T_nominal = 273.15 + 20
    "Nominal temperature for calculation of water properties";

  constant Modelica.SIunits.VelocityOfSound a_nominal=
    Modelica.Media.Water.IF97_Utilities.velocityOfSound_pT(p_nominal, T_nominal)
    "Constant velocity of sound";

  constant Modelica.SIunits.SpecificHeatCapacity cp_nominal=
    Modelica.Media.Water.IF97_Utilities.cp_pT(p_nominal, T_nominal)
    "Specific heat capacity at nominal water conditions";

  constant Modelica.SIunits.Density d_nominal=
    Modelica.Media.Water.IF97_Utilities.rho_pT(p_nominal, T_nominal)
    "Density at nominal water conditions";

  constant Modelica.SIunits.DynamicViscosity eta_nominal=
   Modelica.Media.Water.IF97_Utilities.dynamicViscosity(
     d_nominal,
     T_nominal,
     p_nominal)
   "Constant dynamic viscosity";

  constant Modelica.SIunits.ThermalConductivity lambda_nominal=
    Modelica.Media.Water.IF97_Utilities.thermalConductivity(
     d_nominal,
     T_nominal,
     p_nominal)
    "Constant thermal conductivity";

  constant Modelica.SIunits.AbsolutePressure p_nominal = 101325
    "Nominal pressure for calculation of water properties";