A simple, full-featured, lightweight CoolProp wrapper for Python.
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How to install
Run the following command:
pip install pyfluidsProject structure
Fluidclass - for pure fluids and binary mixtures.Mixtureclass - for mixtures with pure fluids components.FluidsListenum - list of all available fluids.Inputclass - inputs for theFluidandMixtureclasses.HumidAirclass - for humid air.InputHumidAirclass - inputs for theHumidAirclass.
List of properties
If the required property is not present in the instance of the fluid, then you can add it by extending
the Fluid, Mixture or HumidAir classes (see how to add other properties).
Properties of Fluid and Mixture instances
compressibility- compressibility factor (dimensionless).conductivity- thermal conductivity (W/m/K).critical_pressure- absolute pressure at the critical point (Pa).critical_temperature- temperature at the critical point (°C).density- mass density (kg/m3).dynamic_viscosity- dynamic viscosity (Pa*s).enthalpy- mass specific enthalpy (J/kg).entropy- mass specific entropy (J/kg/K).freezing_temperature- temperature at freezing point (for incompressible fluids) (°C).internal_energy- mass specific internal energy (J/kg).kinematic_viscosity- kinematic viscosity (m2/s).max_pressure- maximum pressure limit (Pa).max_temperature- maximum temperature limit (°C).min_pressure- minimum pressure limit (Pa).min_temperature- minimum temperature limit (°C).molar_mass- molar mass (kg/mol).phase- phase state (enum).prandtl- Prandtl number (dimensionless).pressure- absolute pressure (Pa).quality- mass vapor quality (%).sound_speed- sound speed (m/s).specific_heat- mass specific constant pressure specific heat (J/kg/K).surface_tension- surface tension (N/m).temperature- temperature (°C).triple_pressure- absolute pressure at the triple point (Pa).triple_temperature- temperature at the triple point (°C).
Properties of HumidAir instances
compressibility- compressibility factor (dimensionless).conductivity- thermal conductivity (W/m/K).density- mass density per humid air unit (kg/m3).dew_temperature- dew-point temperature (°C).dynamic_viscosity- dynamic viscosity (Pa*s).enthalpy- mass specific enthalpy per humid air (J/kg).entropy- mass specific entropy per humid air (J/kg/K).humidity- absolute humidity ratio (kg/kg d.a.).kinematic_viscosity- kinematic viscosity (m2/s).partial_pressure- partial pressure of water vapor (Pa).prandtl- Prandtl number (dimensionless).pressure- absolute pressure (Pa).relative_humidity- relative humidity ratio (%).specific_heat- mass specific constant pressure specific heat per humid air (J/kg/K).temperature- dry-bulb temperature (°C).wet_bulb_temperature- wet-bulb temperature (°C).
List of methods
For more information, see the docstrings.
Methods of Fluid instances
factory- returns a new fluid object with no defined state.with_state- returns a new fluid object with a defined state.update- update fluid state.reset- reset all non-trivial properties.clone- performs deep (full) copy of the fluid instance.isentropic_compression_to_pressure- the process of isentropic compression to a given pressure.compression_to_pressure- the process of compression to a given pressure.isenthalpic_expansion_to_pressure- the process of isenthalpic expansion to a given pressure.isentropic_expansion_to_pressure- the process of isentropic expansion to a given pressure.expansion_to_pressure- the process of expansion to a given pressure.cooling_to_temperature- the process of cooling to a given temperature.cooling_to_enthalpy- the process of cooling to a given enthalpy.heating_to_temperature- the process of heating to a given temperature.heating_to_enthalpy- the process of heating to a given enthalpy.bubble_point_at_pressure- bubble point at a given pressure.bubble_point_at_temperature- bubble point at a given temperature.dew_point_at_pressure- dew point at a given pressure.dew_point_at_temperature- dew point at a given temperature.two_phase_point_at_pressure- two-phase point at a given pressure.mixing- the mixing process.as_json- converts the fluid instance to a JSON string.as_dict- converts the fluid instance to a dict.
Methods of Mixture instances
factory- returns a new fluid object with no defined state.with_state- returns a new fluid object with a defined state.update- update fluid state.reset- reset all non-trivial properties.clone- performs deep (full) copy of the mixture instance.cooling_to_temperature- the process of cooling to a given temperature.heating_to_temperature- the process of heating to a given temperature.as_json- converts the mixture instance to a JSON string.as_dict- converts the mixture instance to a dict.
Methods of HumidAir instances
factory- returns a new humid air object with no defined state.with_state- returns a new humid air object with a defined state.update- update humid air state.reset- reset all properties.clone- performs deep (full) copy of the humid air instance.dry_cooling_to_temperature- the process of cooling without dehumidification to a given temperature.dry_cooling_to_enthalpy- the process of cooling without dehumidification to a given enthalpy.wet_cooling_to_temperature_and_relative_humidity- the process of cooling with dehumidification to a given temperature and relative humidity ratio.wet_cooling_to_temperature_and_absolute_humidity- the process of cooling with dehumidification to a given temperature and absolute humidity ratio.wet_cooling_to_enthalpy_and_relative_humidity- the process of cooling with dehumidification to a given enthalpy and relative humidity ratio.wet_cooling_to_enthalpy_and_absolute_humidity- the process of cooling with dehumidification to a given enthalpy and absolute humidity ratio.heating_to_temperature- the process of heating to a given temperature.heating_to_enthalpy- the process of heating to a given enthalpy.humidification_by_water_to_relative_humidity- the process of humidification by water (isenthalpic) to a given relative humidity ratio.humidification_by_water_to_absolute_humidity- the process of humidification by water (isenthalpic) to a given absolute humidity ratio.humidification_by_steam_to_relative_humidity- the process of humidification by steam (isothermal) to a given relative humidity ratio.humidification_by_steam_to_absolute_humidity- the process of humidification by steam (isothermal) to a given absolute humidity ratio.mixing- the mixing process.as_json- converts the humid air instance to a JSON string.as_dict- converts the humid air instance to a dict.
Examples
Pure fluids
To calculate the specific heat of saturated water vapor at 1 atm:
from pyfluids import Fluid, FluidsList
water_vapour = Fluid(FluidsList.Water).dew_point_at_pressure(101325)
print(water_vapour.specific_heat) # 2079.937085633241Incompressible binary mixtures
To calculate the dynamic viscosity of propylene glycol aqueous solution with 60 % mass fraction at 100 kPa and -20 °C:
from pyfluids import Fluid, FluidsList, Input
propylene_glycol = Fluid(FluidsList.MPG, 60).with_state(
Input.pressure(100e3), Input.temperature(-20)
)
print(propylene_glycol.dynamic_viscosity) # 0.13907391053938878Mixtures
To calculate the density of ethanol aqueous solution (with ethanol 40 % mass fraction) at 200 kPa and 4 °C:
from pyfluids import Mixture, FluidsList, Input
mixture = Mixture([FluidsList.Water, FluidsList.Ethanol], [60, 40]).with_state(
Input.pressure(200e3), Input.temperature(4)
)
print(mixture.density) # 883.3922771627963Humid air
To calculate the wet bulb temperature of humid air at 300 m above sea level, 30 °C and 50 % relative humidity:
from pyfluids import HumidAir, InputHumidAir
humid_air = HumidAir().with_state(
InputHumidAir.altitude(300),
InputHumidAir.temperature(30),
InputHumidAir.relative_humidity(50),
)
print(humid_air.wet_bulb_temperature) # 21.917569033181564Equality of instances
You can simply determine the equality of Fluid, Mixture and HumidAir instances by its state.
Just use the equality operators (== or !=).
Exactly the same way you can compare inputs (Input and InputHumidAir).
For example:
from pyfluids import HumidAir, InputHumidAir
humid_air = HumidAir().with_state(
InputHumidAir.pressure(101325),
InputHumidAir.temperature(20),
InputHumidAir.relative_humidity(50),
)
same_humid_air = HumidAir().with_state(
InputHumidAir.pressure(101.325e3),
InputHumidAir.temperature(20),
InputHumidAir.relative_humidity(50),
)
print(humid_air == same_humid_air) # True
print(InputHumidAir.pressure(101325) == InputHumidAir.pressure(101.325e3)) # TrueConverting to a JSON string
The Fluid, Mixture and HumidAir classes have a method as_json,
which performs converting of instance to a JSON string.
For example, converting a Fluid instance to an indented JSON string:
from pyfluids import Fluid, FluidsList
refrigerant = Fluid(FluidsList.R32).dew_point_at_temperature(5)
print(refrigerant.as_json())As a result:
{
"name": "R32",
"fraction": 100,
"compressibility": 0.8266625877210833,
"conductivity": 0.013435453854396475,
"critical_pressure": 5782000.0,
"critical_temperature": 78.10500000000002,
"density": 25.89088151061046,
"dynamic_viscosity": 1.2606543144761657e-05,
"enthalpy": 516105.7800378023,
"entropy": 2136.2654412978777,
"freezing_temperature": null,
"internal_energy": 479357.39743435377,
"max_pressure": 70000000.0,
"max_temperature": 161.85000000000002,
"min_pressure": 47.999893876059375,
"min_temperature": -136.80999999999997,
"molar_mass": 0.052024,
"phase": "TwoPhase",
"prandtl": 1.2252282243443504,
"pressure": 951448.019691762,
"quality": 100.0,
"sound_speed": 209.6337575990297,
"specific_heat": 1305.7899441785378,
"surface_tension": 0.010110117241546162,
"temperature": 5.0,
"triple_pressure": 47.999893876059375,
"triple_temperature": -136.80999999999997
}Converting to a Python dict
The Fluid, Mixture and HumidAir classes have a method as_dict,
which performs converting of instance to a Python dict.
For example:
from pyfluids import Fluid, FluidsList
refrigerant = Fluid(FluidsList.R32).dew_point_at_temperature(5)
print(refrigerant.as_dict()) # {'name': R32, 'fraction': 100, 'compressibility': ...Deep cloning
The Fluid, Mixture and HumidAir classes have a method clone,
which performs deep (full) copy of instance:
from pyfluids import Fluid, FluidsList, Input
origin = Fluid(FluidsList.Water).with_state(
Input.pressure(101325), Input.temperature(20)
)
clone = origin.clone()
print(origin == clone) # True
clone.update(Input.pressure(101325), Input.temperature(30))
print(origin == clone) # False