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:

- Pressure
**p**and specific enthalpy**h**are the most natural choice for general applications. This is the recommended choice for most general purpose applications, in particular for power plants. - Pressure
**p**and temperature**T**are the most natural choice for applications where water is always in the same phase, both for liquid water and steam. - Density
**d**and temperature**T**are explicit variables of the Helmholtz function in the near-critical region and can be the best choice for applications with super-critical or near-critical states.

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.

Name | Description |
---|---|

SaturationProperties | |

ThermodynamicState | Thermodynamic state |

BaseProperties | Base properties of water |

density_ph | Computes density as a function of pressure and specific enthalpy |

temperature_ph | Computes temperature as a function of pressure and specific enthalpy |

temperature_ps | Compute temperature from pressure and specific enthalpy |

density_ps | Computes density as a function of pressure and specific enthalpy |

pressure_dT | Computes pressure as a function of density and temperature |

specificEnthalpy_dT | Computes specific enthalpy as a function of density and temperature |

specificEnthalpy_pT | Computes specific enthalpy as a function of pressure and temperature |

specificEnthalpy_ps | Computes specific enthalpy as a function of pressure and temperature |

density_pT | Computes density as a function of pressure and temperature |

setDewState | Set the thermodynamic state on the dew line |

setBubbleState | Set the thermodynamic state on the bubble line |

dynamicViscosity | Dynamic viscosity of water |

thermalConductivity | Thermal conductivity of water |

surfaceTension | Surface tension in two phase region of water |

pressure | Return pressure of ideal gas |

temperature | Return temperature of ideal gas |

density | Return density of ideal gas |

specificEnthalpy | Return specific enthalpy |

specificInternalEnergy | Return specific internal energy |

specificGibbsEnergy | Return specific Gibbs energy |

specificHelmholtzEnergy | Return specific Helmholtz energy |

specificEntropy | Specific entropy of water |

specificHeatCapacityCp | Specific heat capacity at constant pressure of water |

specificHeatCapacityCv | Specific heat capacity at constant volume of water |

isentropicExponent | Return isentropic exponent |

isothermalCompressibility | Isothermal compressibility of water |

isobaricExpansionCoefficient | Isobaric expansion coefficient of water |

velocityOfSound | Return velocity of sound as a function of the thermodynamic state record |

isentropicEnthalpy | Compute h(s,p) |

density_derh_p | Density derivative by specific enthalpy |

density_derp_h | Density derivative by pressure |

bubbleEnthalpy | Boiling curve specific enthalpy of water |

dewEnthalpy | Dew curve specific enthalpy of water |

bubbleEntropy | Boiling curve specific entropy of water |

dewEntropy | Dew curve specific entropy of water |

bubbleDensity | Boiling curve specific density of water |

dewDensity | Dew curve specific density of water |

saturationTemperature | Saturation temperature of water |

saturationTemperature_derp | Derivative of saturation temperature w.r.t. pressure |

saturationPressure | Saturation pressure of water |

dBubbleDensity_dPressure | Bubble point density derivative |

dDewDensity_dPressure | Dew point density derivative |

dBubbleEnthalpy_dPressure | Bubble point specific enthalpy derivative |

dDewEnthalpy_dPressure | Dew point specific enthalpy derivative |

setState_dTX | Return thermodynamic state of water as function of d, T, and optional region |

setState_phX | Return thermodynamic state of water as function of p, h, and optional region |

setState_psX | Return thermodynamic state of water as function of p, s, and optional region |

setState_pTX | Return thermodynamic state of water as function of p, T, and optional region |

setSmoothState | Return thermodynamic state so that it smoothly approximates: if x > 0 then state_a else state_b |

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