https://github.com/rtbo/rkz

Redlich-Kwong Z-factor calculator
https://github.com/rtbo/rkz

Last synced: 7 months ago
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Redlich-Kwong Z-factor calculator

• Host: GitHub
• URL: https://github.com/rtbo/rkz
• Owner: rtbo
• License: mit
• Created: 2021-09-17T13:42:13.000Z (over 4 years ago)
• Default Branch: main
• Last Pushed: 2022-09-07T16:13:47.000Z (almost 4 years ago)
• Last Synced: 2025-01-30T19:26:37.903Z (over 1 year ago)
• Language: Rust
• Size: 39.1 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: ReadMe.txt
  • License: License.txt

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README

          
rkz 1.2.0

Rémi Thebault 

Computes compression factor of several gases and mixtures in conditions of

pressure and temperature using the either of the following equations of state:

  - Van der Waals

  - Redlich-Kwong (default)

  - Soave-Redlich-Kwong

  - Peng-Robinson

                                                           PV

The compression factor for a mole of gas is defined as Z = --.

                                                           RT

A range can be provided instead of scalar values for pressure or temperature. In

such case, the result is written in CSV format with one Z value per combination

of pressure and temperature (1 row per pressure condition, 1 column per

temperature condition).

Range are provided in the form of min:max[:step] (e.g. '20:800' or '20:800:10').

If step is omitted, it is assumed to be equal to one.

Mixture for option --gas|-g can be specified in the form of

molar_fraction%gas_id+[molar_fraction%gas_id]. Mixture molar fractions can only

be specified as percentage or be omitted. Gases without molar fraction evenly

take the rest of the mixture. Examples:

  - '80%N2+20%O2' => 80% Nitrogen and 20% Oxygen

  - '80%N2+O2' => 80% Nitrogen and 20% Oxygen

  - '80%N2+O2+CO2' => 80% Nitrogen, 10% Oxygen and 10% Carbon dioxide

  - '78%N2+21%O2+Ar' => air composition (more or less)

  - 'N2+O2' => 50% Nitrogen and 50% Oxygen

DISCLAIMER: rkz is provided "as is" without any warranty. See the --license

option for details.

USAGE:

    rkz [FLAGS] [OPTIONS]

FLAGS:

    -h, --help        Prints help information

        --license     Prints the license text and exits

        --list-gas    Prints a list of referenced gases

    -V, --version     Prints version information

OPTIONS:

    -e, --eos 

            Specify the equation of state (case insensitive). Choices are VdW

            for Van-der-Waals, RK for Redlich-Kwong, SRK for Soave-Redlich-Kwong

            and PR for Peng-Robinson. [default: RK]

    -g, --gas 

            Specify the gas by id or by mixture spec (see above)

    -p, --pressure 

            Specify the pressure in bar. By default absolute unless --relative

            is used. A range can be specified in the form of start:stop[:step].

    -r, --relative 

            Specify that the pressure is relative to the pressure indicated in

            this parameter (in hPa). "stdatm" can be used for 1013.25.

    -t, --temperature 

            Specify the temperature in °C. A range can be specified in the form

            of start:stop[:step].

EXAMPLES:

    rkz --list-gas

        Print a list of all gases referenced in RKZ

    rkz -g N2 -p 200 -t 20

        Z-factor of Nitrogen at 200bar and 20°C

    rkz -g 78%N2+21%O2+Ar -p 200 -t 50 -e PR

        Z-factor of air at 200bar and 50°C with Peng-Robinson equation of state

    rkz -g H2 -p 0:1000:10 -t -40:80 -r stdatm

        Z-factor CSV table of Hydrogen from 0 to 1000barG and -40 to +80°C