pyforfluids.models package
Module contents
Models.
Modules that contains the multiple models to estimate fluid’s properties.
Submodules
pyforfluids.models.gerg2008 module
GERG2008 EoS.
- class pyforfluids.models.gerg2008.GERG2008
Bases:
objectGERG2008 equation of state.
GERG2008 Equation of state described by O. Kunz and W. Wagner [1]
The components must be those of the GERG2008 model. This class use imported methods from Fortran subroutines for high speed calculation of properties.
References
- 1
O. Kunz and W. Wagner, “The GERG-2008 Wide-Range Equation of State for Natural Gases and Other Mixtures: An Expansion of GERG-2004”, J. Chem. Eng. Data 2012, 57, 11, 3032–3091. doi:10.1021/je300655b. https://pubs.acs.org/doi/10.1021/je300655b
Methods
validate_components:
Check if the components belong to the EOS.
validate_ranges:
Check in which range of validity are the temperature and pressure.
set_concentration:
Normalize the composition as molar fractions.
calculate_properties:
Calculate the properties.
- calculate_properties(temperature, pressure, density, composition)
Calculate the thermodynamic properties of the given fluid.
Calculation of the thermodynamic properties of the fluid at it’s given temperature and density.
- Parameters
- temperature: float
Fluid temperature in Kelvin degrees [K]
- pressure: float
Fluid pressure in Pascal [Pa]
- density: float
Fluid density in mol per liter [mol/L]
- composition: dict
Dictionary of the compounds concentrations as:
{"methane": 0.8, "ethane":0.2}When necessary, the concentration values are normalized.
- Returns
- dict
Dictionary of the thermodynamic properties of the given fluid calculated with GERG2008 equation of state.
- name = 'GERG2008'
- set_concentration(composition)
Verify if the sum of the molar fractions of the fluid components is 1.
If not, a warninig message is sent and the composition is normalized.
- Parameters
- components: dict
Dictionary of the fluid compounds as keys and their molar fraction as values.
- Returns
- array
Array of the normalized fluid composition vector.
- valid_components = {'argon', 'butane', 'carbon_dioxide', 'carbon_monoxide', 'decane', 'ethane', 'helium', 'heptane', 'hexane', 'hydrogen', 'hydrogen_sulfide', 'isobutane', 'isopentane', 'methane', 'nitrogen', 'nonane', 'octane', 'oxygen', 'pentane', 'propane', 'water'}
- validate_components(components)
Validate fluid components.
Verify if the given fluid components are valid for the GERG2008 equation of state.If not, a ValueError Exception is raised.
- Parameters
- components: set
Set of the fluid components to be verified.
- validate_ranges(temperature, pressure)
Validate fluid temperature and pressure.
Verify whether the fluid temperature and pressure values belong to the normal, extended or invalid use range of the GERG2008 equation of state. A warning menssage is sent if the temperature and pressure conditions are those of the extended or invalid range, and also if they take negative values.
- Parameters
- temperature: float
Fluid temperature in Kelvin degrees [K]
- pressure: float
Fluid pressure in Pascal [Pa]