fluidprop 1.2.0

Easy access to thermodynamic fluid properties as a function of temperature and pressure. With a minimal command-line interface.

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.

• Github: https://github.com/Dennis-van-Gils/python-fluidprop

• PyPI: https://pypi.org/project/fluidprop

Installation:

pip install fluidprop

or if you’re on macOS or Linux, try:

pip3 install fluidprop

EOS models

Thermodynamic properties are provided by CoolProp, the open-source alternative to NIST refprop, with most of the calculations relying on the same equation-of-state (EOS) models as refprop.

• http://www.coolprop.org/

• http://pubs.acs.org/doi/abs/10.1021/ie4033999

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             41 | MD4M                 82 | R1233zd(E)
    1 | Acetone              42 | MDM                  83 | R1234yf
    2 | Air                  43 | Methane              84 | R1234ze(E)
    3 | Ammonia              44 | Methanol             85 | R1234ze(Z)
    4 | Argon                45 | MethylLinoleate      86 | R124
    5 | Benzene              46 | MethylLinolenate     87 | R1243zf
    6 | CarbonDioxide        47 | MethylOleate         88 | R125
    7 | CarbonMonoxide       48 | MethylPalmitate      89 | R13
    8 | CarbonylSulfide      49 | MethylStearate       90 | R134a
    9 | cis-2-Butene         50 | MM                   91 | R13I1
   10 | CycloHexane          51 | n-Butane             92 | R14
   11 | Cyclopentane         52 | n-Decane             93 | R141b
   12 | CycloPropane         53 | n-Dodecane           94 | R142b
   13 | D4                   54 | n-Heptane            95 | R143a
   14 | D5                   55 | n-Hexane             96 | R152A
   15 | D6                   56 | n-Nonane             97 | R161
   16 | Deuterium            57 | n-Octane             98 | R21
   17 | Dichloroethane       58 | n-Pentane            99 | R218
   18 | DiethylEther         59 | n-Propane           100 | R22
   19 | DimethylCarbonate    60 | n-Undecane          101 | R227EA
   20 | DimethylEther        61 | Neon                102 | R23
   21 | Ethane               62 | Neopentane          103 | R236EA
   22 | Ethanol              63 | Nitrogen            104 | R236FA
   23 | EthylBenzene         64 | NitrousOxide        105 | R245ca
   24 | Ethylene             65 | Novec649            106 | R245fa
   25 | EthyleneOxide        66 | o-Xylene            107 | R32
   26 | Fluorine             67 | OrthoDeuterium      108 | R365MFC
   27 | HeavyWater           68 | OrthoHydrogen       109 | R40
   28 | Helium               69 | Oxygen              110 | R404A
   29 | HFE143m              70 | p-Xylene            111 | R407C
   30 | Hydrogen             71 | ParaDeuterium       112 | R41
   31 | HydrogenChloride     72 | ParaHydrogen        113 | R410A
   32 | HydrogenSulfide      73 | Propylene           114 | R507A
   33 | IsoButane            74 | Propyne             115 | RC318
   34 | IsoButene            75 | R11                 116 | SES36
   35 | Isohexane            76 | R113                117 | SulfurDioxide
   36 | Isopentane           77 | R114                118 | SulfurHexafluoride
   37 | Krypton              78 | R115                119 | Toluene
   38 | m-Xylene             79 | R116                120 | trans-2-Butene
   39 | MD2M                 80 | R12                 121 | Water
   40 | MD3M                 81 | R123                122 | Xenon

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:

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, 13-05-2024

Changelog

1.2.0 (2024-05-13)

• Added rbc.py: A quick ‘pocket calculator’ for Rayleigh-Bénard Convection.

• show_cli() will not show an end report by itself anymore. You’ll have to call report() afterwards yourselves.

1.1.0 (2024-05-12)

• Added field Cv: Isochoric heat capacity.

• Added field comp: Isothermal compressibility.

1.0.0 (2024-05-11)

• Initial release.