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rgfrosh.thermo

ThermoInterface

Bases: Protocol

Class defining the required interface for calculating mixture thermodynamic properties.

TP: Tuple[float, float] abstractmethod property writable

Get/set temperature [K] and pressure [Pa].

mean_molecular_weight: float abstractmethod property

The mean molecular weight (molar mass) [kg/kmol].

density_mass: float abstractmethod property

(Mass) density [kg/m3].

cp_mass: float abstractmethod property

Specific heat capacity at constant pressure [J/kg/K].

enthalpy_mass: float abstractmethod property

Specific enthalpy [J/kg].

isothermal_compressibility: float abstractmethod property

Isothermal compressibility [1/Pa].

thermal_expansion_coeff: float abstractmethod property

Thermal expansion coefficient [1/K].

CPInterface

Bases: ThermoInterface

0.1.4

Note

Only available if CoolProp is installed.

Wrapper for CoolProp.AbstractState objects that accounts for differing property names and automatically adjusts units for mean_molecular_weight.

Source code in rgfrosh\thermo.py 
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class CPInterface(ThermoInterface):
    """
    :octicons-tag-24: 0.1.4

    !!! Note
        Only available if `CoolProp` is installed.

    Wrapper for `CoolProp.AbstractState` objects that accounts for
    differing property names and automatically adjusts units for
    `mean_molecular_weight`.
    """

    def __init__(self, state: CP.AbstractState):
        self.state = state

    @property
    def mean_molecular_weight(self):
        return self.state.molar_mass() * 1e3  # [kg/mol] to [kg/kmol]

    @property
    def TP(self):
        return self.state.T(), self.state.p()

    @TP.setter
    def TP(self, value):
        T, P = value
        self.state.update(CP.PT_INPUTS, P, T)

    @property
    def density_mass(self):
        return self.state.rhomass()

    @property
    def cp_mass(self):
        return self.state.cpmass()

    @property
    def enthalpy_mass(self):
        return self.state.hmass()

    @property
    def isothermal_compressibility(self):
        return self.state.isothermal_compressibility()

    @property
    def thermal_expansion_coeff(self):
        return self.state.isobaric_expansion_coefficient()