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fluidprop
Easy access to thermodynamic fluid properties as a function of temperature and
pressure. Comes with a minimal command-line interface for quick inspection.
Provides class FluidProperties() useful for working out dataseries in your
own scripts.
Installation::
pip install fluidprop
or if you’re on macOS or Linux, try::
pip3 install fluidprop
Raison d’être
Science advances every year and with it the accuracy of tabulated/parametrized
fluid properties. Don’t reinvent the wheel by coding your own equation-of-state
models from the literature. Or copy-pasting possibly outdated values from the
internet.
EOS models
Thermodynamic properties are provided by CoolProp, the open-source alternative
to NIST refprop <https://www.nist.gov/srd/refprop>_, with most of the
calculations relying on the same equation-of-state (EOS) models as refprop.
Command-line interface
You can run this module from the terminal with::
python -m fluidprop
or if you’re on macOS or Linux, try::
python3 -m fluidprop
It will show a minimal command-line interface which guides the user to enter a
fluid, temperature and pressure. It will print out its thermodynamic properties
as a table to the terminal.
BONUS for the Rayleigh-Bénard convection community. Running::
python -m rbc
will show a command-line interface acting as a ‘pocket calculator’ to calculate
the Rayleigh and other numbers based on the user input.
Example output of fluidprop::
https://github.com/Dennis-van-Gils/python-fluidprop
Thermodynamic properties by CoolProp v6.6.0
http://pubs.acs.org/doi/abs/10.1021/ie4033999
All known fluids:
0 | 1-Butene 46 | MethylLinoleate 92 | R1234yf
1 | Acetone 47 | MethylLinolenate 93 | R1234ze(E)
2 | Air 48 | MethylOleate 94 | R1234ze(Z)
3 | Ammonia 49 | MethylPalmitate 95 | R124
4 | Argon 50 | MethylStearate 96 | R1243zf
5 | Benzene 51 | MM 97 | R125
6 | CarbonDioxide 52 | n-Butane 98 | R13
7 | CarbonMonoxide 53 | n-Decane 99 | R1336mzz(E)
8 | CarbonylSulfide 54 | n-Dodecane 100 | R1336mzz(Z)
9 | Chlorine 55 | n-Heptane 101 | R134a
10 | cis-2-Butene 56 | n-Hexane 102 | R13I1
11 | CycloHexane 57 | n-Nonane 103 | R14
12 | Cyclopentane 58 | n-Octane 104 | R141b
13 | CycloPropane 59 | n-Pentane 105 | R142b
14 | D4 60 | n-Perfluorobutane 106 | R143a
15 | D5 61 | n-Perfluorohexane 107 | R152A
16 | D6 62 | n-Perfluoropentane 108 | R161
17 | Deuterium 63 | n-Propane 109 | R21
18 | Dichloroethane 64 | n-Undecane 110 | R218
19 | DiethylEther 65 | Neon 111 | R22
20 | DimethylCarbonate 66 | Neopentane 112 | R227EA
21 | DimethylEther 67 | Nitrogen 113 | R23
22 | Ethane 68 | NitrousOxide 114 | R236EA
23 | Ethanol 69 | Novec649 115 | R236FA
24 | EthylBenzene 70 | o-Xylene 116 | R245ca
25 | Ethylene 71 | OrthoDeuterium 117 | R245fa
26 | EthyleneOxide 72 | OrthoHydrogen 118 | R32
27 | Fluorine 73 | Oxygen 119 | R365MFC
28 | HeavyWater 74 | p-Xylene 120 | R40
29 | Helium 75 | ParaDeuterium 121 | R404A
30 | HFE143m 76 | ParaHydrogen 122 | R407C
31 | Hydrogen 77 | Propylene 123 | R41
32 | HydrogenChloride 78 | PropyleneGlycol 124 | R410A
33 | HydrogenSulfide 79 | Propyne 125 | R507A
34 | IsoButane 80 | R11 126 | RC318
35 | IsoButene 81 | R1123 127 | SES36
36 | Isohexane 82 | R113 128 | SulfurDioxide
37 | Isopentane 83 | R1130(E) 129 | SulfurHexafluoride
38 | Krypton 84 | R1132(E) 130 | Tetrahydrofuran
39 | m-Xylene 85 | R114 131 | Toluene
40 | MD2M 86 | R115 132 | trans-2-Butene
41 | MD3M 87 | R116 133 | VinylChloride
42 | MD4M 88 | R12 134 | Water
43 | MDM 89 | R1224YDZ 135 | Xenon
44 | Methane 90 | R123
45 | Methanol 91 | R1233zd(E)
Enter fluid number: 121
Enter temperature | T ['C] : 20
Enter pressure | P [bar] : a
Enter pressure | P [atm] : 1
------------------------------------------------------------
Liquid: Water (H₂O)
@ Temperature | T = 20.000 'C = 293.150 K
@ Pressure | P = 1.013 bar
------------------------------------------------------------
Molecular weight | MW = 18.01527 g/mol
Density | rho = 9.982e+02 kg/m^3
Kinematic viscosity | nu = 1.003e-06 m^2/s
Dynamic viscosity | eta = 1.002e-03 kg/(m s)
Thermal exp. coeff. | alpha = 2.068e-04 1/K
Thermal diffusivity | kappa = 1.432e-07 m^2/s
Thermal conductivity | lambda_ = 5.980e-01 W/(m K)
Isobaric heat capac. | Cp = 4.184e+03 J/(kg K)
Isochoric heat capac. | Cv = 4.157e+03 J/(kg K)
Isothermal compress. | comp = 4.589e-10 1/Pa
Prandtl | Pr = 7.008
------------------------------------------------------------
When asked to enter the temperature in ['C], you can once enter a single
character instead to change the input unit to::
k | [K] Kelvin K - 273.15 'C
f | ['F] Degrees Fahrenheit ('F - 32) * 5 / 9 'C
When asked to enter the pressure in [bar], you can once enter a single
character instead to change the input unit to::
a | [atm] Atmosphere = 1.01325 bar
m | [mmHg] Millimeter mercury ≈ 1 atm / 760
p | [psi] Pounds per square inch = 1 / 14.504 bar
t | [torr] Torr = 1 atm / 760
FluidProperties()
This class evaluates thermodynamic fluid properties of the given fluid at the
given temperature(s) in ['C] and pressure(s) in [bar]. The results are
stored as properties to this class as numpy.ndarray arrays. Useful for
working out dataseries.
Example:
… code-block:: python
from fluidprop import FluidProperties
fluid = FluidProperties("Water", 20, 1)
print(fluid.rho) # [998.2065435]
fluid = FluidProperties("Water", [20, 21, 22], 1)
print(fluid.rho) # [998.2065435 997.99487638 997.77288644]
List of stored properties::
coolprop_name (str): CoolProp name of the fluid.
formula (str): Chemical formula of the fluid.
MW (float) : Molecular weight [kg/mol]
T (ndarray): Evaluated temperature [K]
P (ndarray): Evaluated pressure [Pa]
rho (ndarray): Density [kg/m^3]
nu (ndarray): Kinematic viscosity [m^2/s]
eta (ndarray): Dynamic/shear viscosity [kg/(m s)]
alpha (ndarray): Thermal expansion coefficient [1/K]
kappa (ndarray): Thermal diffusivity [m^2/s]
lambda_ (ndarray): Thermal conductivity [W/(m K)]
Cp (ndarray): Isobaric heat capacity [J/(kg K)]
Cv (ndarray): Isochoric heat capacity [J/(kg K)]
comp (ndarray): Isothermal compressibility [1/Pa]
Pr (ndarray): Prandtl number [-]
Dennis van Gils, 10-08-2026
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