WOLFRAM SYSTEM MODELER
WaterIF97_baseWater: Steam properties as defined by IAPWS/IF97 standard |
Thermodynamic state |
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Base properties of water |
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Computes density as a function of pressure and specific enthalpy |
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Computes temperature as a function of pressure and specific enthalpy |
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Compute temperature from pressure and specific enthalpy |
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Computes density as a function of pressure and specific enthalpy |
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Computes pressure as a function of density and temperature |
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Computes specific enthalpy as a function of density and temperature |
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Computes specific enthalpy as a function of pressure and temperature |
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Computes specific enthalpy as a function of pressure and temperature |
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Computes density as a function of pressure and temperature |
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Set the thermodynamic state on the dew line |
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Set the thermodynamic state on the bubble line |
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Dynamic viscosity of water |
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Thermal conductivity of water |
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Surface tension in two phase region of water |
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Return pressure of ideal gas |
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Return temperature of ideal gas |
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Return density of ideal gas |
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Return specific enthalpy |
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Return specific internal energy |
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Return specific Gibbs energy |
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Return specific Helmholtz energy |
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Specific entropy of water |
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Specific heat capacity at constant pressure of water |
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Specific heat capacity at constant volume of water |
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Return isentropic exponent |
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Isothermal compressibility of water |
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Isobaric expansion coefficient of water |
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Return velocity of sound as a function of the thermodynamic state record |
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Compute h(s,p) |
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Density derivative by specific enthalpy |
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Density derivative by pressure |
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Boiling curve specific enthalpy of water |
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Dew curve specific enthalpy of water |
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Boiling curve specific entropy of water |
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Dew curve specific entropy of water |
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Boiling curve specific density of water |
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Dew curve specific density of water |
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Saturation temperature of water |
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Derivative of saturation temperature w.r.t. pressure |
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Saturation pressure of water |
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Bubble point density derivative |
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Dew point density derivative |
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Bubble point specific enthalpy derivative |
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Dew point specific enthalpy derivative |
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Return thermodynamic state of water as function of d, T, and optional region |
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Return thermodynamic state of water as function of p, h, and optional region |
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Return thermodynamic state of water as function of p, s, and optional region |
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Return thermodynamic state of water as function of p, T, and optional region |
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Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b |
ThermoStates |
Value: Type: IndependentVariables Description: Enumeration type for independent variables |
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mediumName |
Value: "WaterIF97" Type: String Description: Name of the medium |
substanceNames |
Value: {"water"} Type: String[:] Description: Names of the mixture substances. Set substanceNames={mediumName} if only one substance. |
extraPropertiesNames |
Value: fill("", 0) Type: String[:] Description: Names of the additional (extra) transported properties. Set extraPropertiesNames=fill("",0) if unused |
singleState |
Value: false Type: Boolean Description: = true, if u and d are not a function of pressure |
reducedX |
Value: true Type: Boolean Description: = true if medium contains the equation sum(X) = 1.0; set reducedX=true if only one substance (see docu for details) |
fixedX |
Value: true Type: Boolean Description: = true if medium contains the equation X = reference_X |
reference_p |
Value: 101325 Type: AbsolutePressure (Pa) Description: Reference pressure of Medium: default 1 atmosphere |
reference_T |
Value: 298.15 Type: Temperature (K) Description: Reference temperature of Medium: default 25 deg Celsius |
reference_X |
Value: fill(1 / nX, nX) Type: MassFraction[nX] (kg/kg) Description: Default mass fractions of medium |
p_default |
Value: 101325 Type: AbsolutePressure (Pa) Description: Default value for pressure of medium (for initialization) |
T_default |
Value: Modelica.Units.Conversions.from_degC(20) Type: Temperature (K) Description: Default value for temperature of medium (for initialization) |
h_default |
Value: specificEnthalpy_pTX(p_default, T_default, X_default) Type: SpecificEnthalpy (J/kg) Description: Default value for specific enthalpy of medium (for initialization) |
X_default |
Value: reference_X Type: MassFraction[nX] (kg/kg) Description: Default value for mass fractions of medium (for initialization) |
C_default |
Value: fill(0, nC) Type: ExtraProperty[nC] Description: Default value for trace substances of medium (for initialization) |
nS |
Value: size(substanceNames, 1) Type: Integer Description: Number of substances |
nX |
Value: nS Type: Integer Description: Number of mass fractions |
nXi |
Value: if fixedX then 0 else if reducedX then nS - 1 else nS Type: Integer Description: Number of structurally independent mass fractions (see docu for details) |
nC |
Value: size(extraPropertiesNames, 1) Type: Integer Description: Number of extra (outside of standard mass-balance) transported properties |
C_nominal |
Value: 1.0e-6 * ones(nC) Type: Real[nC] Description: Default for the nominal values for the extra properties |
smoothModel |
Value: false Type: Boolean Description: True if the (derived) model should not generate state events |
onePhase |
Value: false Type: Boolean Description: True if the (derived) model should never be called with two-phase inputs |
fluidConstants |
Value: waterConstants Type: FluidConstants[nS] Description: Constant data for the fluid |
Region |
Value: 0 Type: Integer Description: Region of IF97, if known, zero otherwise |
ph_explicit |
Value: Type: Boolean Description: True if explicit in pressure and specific enthalpy |
dT_explicit |
Value: Type: Boolean Description: True if explicit in density and temperature |
pT_explicit |
Value: Type: Boolean Description: True if explicit in pressure and temperature |
This information is part of the Modelica Standard Library maintained by the Modelica Association.
This model calculates medium properties for water in the liquid, gas and two phase regions according to the IAPWS/IF97 standard, i.e., the accepted industrial standard and best compromise between accuracy and computation time. For more details see Modelica.Media.Water.IF97_Utilities. Three variable pairs can be the independent variables of the model:
The following quantities are always computed:
Variable | Unit | Description |
T | K | temperature |
u | J/kg | specific internal energy |
d | kg/m^3 | density |
p | Pa | pressure |
h | J/kg | specific enthalpy |
In some cases additional medium properties are needed. A component that needs these optional properties has to call one of the functions listed in Modelica.Media.UsersGuide.MediumUsage.OptionalProperties and in Modelica.Media.UsersGuide.MediumUsage.TwoPhase.
Many further properties can be computed. Using the well-known Bridgman's Tables, all first partial derivatives of the standard thermodynamic variables can be computed easily.
SystemModel["Modelica.Media.Water.WaterIF97_base"]
Modelica.Media.Water Water: Steam properties as defined by IAPWS/IF97 standard, fixed region |
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Modelica.Media.Water Water using the IF97 standard, explicit in p and h |
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Modelica.Media.Water Water using the IF97 standard, explicit in p and T |
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Modelica.Media.Water Water using the IF97 standard, explicit in p and h, and only valid outside the two-phase dome |