armi.materials.water module

class armi.materials.water.Water[source]

Bases: armi.materials.material.Fluid

This is a good faith implementation of the Revised Supplementary Properties of Ordinary Water Substance (1992) by IAPWS – International Association for the Properties of Water and Steam .

This is an abstract class implemented on the Saturated Water Material Class and the Saturated Steam Material Class, which should be good enough for most uses.

http://www.iapws.org/relguide/supsat.pdf IAPWS-IF97 is now the international standard for calculations in the steam power industry

name = 'Water'

String identifying the material

thermalScatteringLaws = (<ThermalScatteringLaw - Compound: H2O, Nuclides: frozenset({<NaturalNuclideBase H:  Z:1, W:1.007976e+00, Label:H>}),)

A tuple of ThermalScattering instances with information about thermal scattering.

references = {'density (saturated steam)': 'IAPWS SR1-86 Revised Supplementary Release on Saturation Properties of Ordinary Water and Steam', 'density (saturated water)': 'IAPWS SR1-86 Revised Supplementary Release on Saturation Properties of Ordinary Water and Steam', 'enthalpy (saturated steam)': 'IAPWS SR1-86 Revised Supplementary Release on Saturation Properties of Ordinary Water and Steam', 'enthalpy (saturated water)': 'IAPWS SR1-86 Revised Supplementary Release on Saturation Properties of Ordinary Water and Steam', 'entropy (saturated steam)': 'IAPWS SR1-86 Revised Supplementary Release on Saturation Properties of Ordinary Water and Steam', 'entropy (saturated water)': 'IAPWS SR1-86 Revised Supplementary Release on Saturation Properties of Ordinary Water and Steam', 'vapor pressure': 'IAPWS SR1-86 Revised Supplementary Release on Saturation Properties of Ordinary Water and Steam'}

citation}

Type

The literature references {property

TEMPERATURE_CRITICAL_K = 647.096
DENSITY_CRITICAL_KGPERCUBICMETER = 322.0
DENSITY_CRITICAL_GPERCUBICCENTIMETER = 0.322
VAPOR_PRESSURE_CRITICAL_MPA = 22.064
VAPOR_PRESSURE_CRITICAL_PA = 22064000.0
ALPHA_0 = 1000
PHI_0 = 1.5453657571674064
d = {1: -5.65134998e-08, 2: 2690.66631, 3: 127.287297, 4: -135.003439, 5: 0.981825814, 'alpha': -1135.905627715, 'phi': 2319.5246}
setDefaultMassFracs() → None[source]
theta(Tk: Optional[float] = None, Tc: Optional[float] = None) → float[source]

returns temperature normalized to the critical temperature

tau(Tc: Optional[float] = None, Tk: Optional[float] = None) → float[source]

returns 1 - temperature normalized to the critical temperature

Note

thermophysical correlations are give in Tau rather than Tk or Tc

vaporPressure(Tk: Optional[float] = None, Tc: Optional[float] = None) → float[source]

Returns vapor pressure in (Pa)

Parameters

  • Tk (float) – temperature in Kelvin

  • Tc (float) – temperature in Celcius

Returns

vaporPressure – vapor pressure in Pa

Return type

float

Notes

IAPWS-IF97 http://www.iapws.org/relguide/supsat.pdf IAPWS-IF97 is now the international standard for calculations in the steam power industry

vaporPressurePrime(Tk: Optional[float] = None, Tc: Optional[float] = None, dT: float = 1e-06) → float[source]

approximation of derivative of vapor pressure wrt temperature

Parameters

  • Tk (float) – temperature in Kelvin

  • Tc (float) – temperature in Celcius

Note

this uses a numerical approximation

auxiliaryQuantitySpecificEnthalpy(Tk: Optional[float] = None, Tc: Optional[float] = None) → float[source]

Returns the auxiliary quantity for specific enthalpy

Parameters

  • Tk (float) – temperature in Kelvin

  • Tc (float) – temperature in Celcius

Returns

alpha – specific quantity for enthalpy in J/kg

Return type

float

Notes

IAPWS-IF97 http://www.iapws.org/relguide/supsat.pdf IAPWS-IF97 is now the international standard for calculations in the steam power industry

alpha is used in the relations for enthalpy h = alpha + T/pressure*dp/dT

auxiliaryQuantitySpecificEntropy(Tk: Optional[float] = None, Tc: Optional[float] = None) → float[source]

Returns the auxiliary quantity for specific entropy

Parameters

  • Tk (float) – temperature in Kelvin

  • Tc (float) – temperature in Celcius

Returns

phi – specific quantity for entropy in J/(kgK)

Return type

float

Notes

IAPWS-IF97 http://www.iapws.org/relguide/supsat.pdf IAPWS-IF97 is now the international standard for calculations in the steam power industry

alpha is used in the relations for enthalpy s = phi + 1/pressure*dp/dT

enthalpy(Tk: Optional[float] = None, Tc: Optional[float] = None) → float[source]

Returns enthalpy of saturated water

Parameters

  • Tk (float) – temperature in Kelvin

  • Tc (float) – temperature in Celcius

Returns

enthalpy – vapor pressure in J/kg

Return type

float

Notes

IAPWS-IF97 http://www.iapws.org/relguide/supsat.pdf IAPWS-IF97 is now the international standard for calculations in the steam power industry

entropy(Tk: Optional[float] = None, Tc: Optional[float] = None) → float[source]

Returns entropy of saturated water

Parameters

  • Tk (float) – temperature in Kelvin

  • Tc (float) – temperature in Celcius

Returns

entropy – entropy in J/(kgK)

Return type

float

Notes

IAPWS-IF97 http://www.iapws.org/relguide/supsat.pdf IAPWS-IF97 is now the international standard for calculations in the steam power industry

pseudoDensity(Tk=None, Tc=None)[source]

Density for arbitrary forms of water.

Notes

In ARMI, we define pseudoDensity() and density() as the same for Fluids.

class armi.materials.water.SaturatedWater[source]

Bases: armi.materials.water.Water

Saturated Water

This is a good faith implementation of the Revised Supplementary Properties of Ordinary Water Substance (1992) by IAPWS – International Association for the Properties of Water and Steam .

This is the Saturated Liquid Water Material Class. For steam look to the Saturated Steam Material Class.

name = 'SaturatedWater'

String identifying the material

pseudoDensity(Tk: Optional[float] = None, Tc: Optional[float] = None) → float[source]

returns density in g/cc

Parameters

  • Tk (float) – temperature in Kelvin

  • Tc (float) – temperature in Celcius

Returns

density – density in g/cc

Return type

float

Note

In ARMI, we define pseudoDensity() and density() as the same for Fluids. IAPWS-IF97 http://www.iapws.org/relguide/supsat.pdf IAPWS-IF97 is now the international standard for calculations in the steam power industry

class armi.materials.water.SaturatedSteam[source]

Bases: armi.materials.water.Water

Saturated Steam

This is a good faith implementation of the Revised Supplementary Properties of Ordinary Water Substance (1992) by IAPWS – International Association for the Properties of Water and Steam .

This is the Saturated Liquid Water Material Class. For steam look to the Saturated Steam Material Class.

name = 'SaturatedSteam'

String identifying the material

pseudoDensity(Tk: Optional[float] = None, Tc: Optional[float] = None) → float[source]

returns density in g/cc

Parameters

  • Tk (float) – temperature in Kelvin

  • Tc (float) – temperature in Celcius

Returns

density – density in g/cc

Return type

float

Notes

In ARMI, we define pseudoDensity() and density() as the same for Fluids. IAPWS-IF97 http://www.iapws.org/relguide/supsat.pdf IAPWS-IF97 is now the international standard for calculations in the steam power industry