armi.materials.water module

class armi.materials.water.Water

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'

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'}

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 = {'alpha': -1135.905627715, 'phi': 2319.5246, 1: -5.65134998e-08, 2: 2690.66631, 3: 127.287297, 4: -135.003439, 5: 0.981825814}

setDefaultMassFracs()

mass fractions

theta(Tk=None, Tc=None)

returns temperature normalized to the critical temperature

tau(Tc=None, Tk=None)

returns 1 - temperature normalized to the critical temperature

Note

thermophysical correlations are give in Tau rather than Tk or Tc

vaporPressure(Tk=None, Tc=None)

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=None, Tc=None, dT=1e-06)

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=None, Tc=None)

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=None, Tc=None)

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=None, Tc=None)

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=None, Tc=None)

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

paramCollectionType

alias of armi.reactor.parameters.parameterCollections.MaterialParameterCollection

class armi.materials.water.SaturatedWater

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'

density(Tk=None, Tc=None)

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

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

paramCollectionType

alias of armi.reactor.parameters.parameterCollections.MaterialParameterCollection

class armi.materials.water.SaturatedSteam

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'

density(Tk=None, Tc=None)

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

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

paramCollectionType

alias of armi.reactor.parameters.parameterCollections.MaterialParameterCollection