RGP Table Generator v.0

• Support for CoolProp and REFPROP backends
• Able to crate a liquid-like metastable region
• Capable of replacing saturation curve with spinodal line
• Sucessfully tested for CO2

Dependencies

• CoolProp==6.4.2dev
• matplotlib==3.5.1
• numpy==1.22.1
• pandas==1.4.0
• scipy==1.7.3

Issues

• Metaestability for mixtures only works with REFPROP backend (should pass the reprop library path)
• Metaestability require large number os discrete points for pressure and temperature.
• HEOS backend(CoolProp) unable to run for mixtures.

Installation

Clone this git repository

git clone https://github.com/properallan/RGPmeta.git

Recomended to create a and enviroment with Python 3.8

conda create -n rgp python=3.8

Activate the environemnt

conda activate rgp

Move to root path of git repository

cd RGPmeta

You are ready to go! (TO RUN USING REFPROP backend, the path to proprietary libraries is set using a command line option -rp /home/ppiper/MEGA/refprop)

Sample command to generate a RGP table for CO2

python3 RGP.py -f CO2 -b HEOS -p 0.518e6,30e6 -T 230,520 -np 100 -nT 100 -ns 100 -mo 1 -sat True -me True -sp True -o out.rgp

python3 should match the python 3 interpreter alias of your operational system

Mixtures only working with REFPROP backend, in this case fluid name should be given as the AbstractState string standard, and mass fractions as a list 0,1, example:

python3.8 RGP.py -f 'CO2&Methane' -mf 0.95,0.05 -b REFPROP -p 1e6,20e6 -T 250,500 -rp /home/ppiper/MEGA/refprop -nT 100 -np 100 -me True -op ./outputs/ -o CO2_50_50_COOLPROP.rgp

Command Line Options

optional arguments:
  -h, --help            show this help message and exit
  -f , --fluid          CoolProp fluidname
  -b , --backend        CoolProp backend e.g. (HEOS, REFPROP)
  -rp , --refprop_path 
                        REFPROP install path
  -p , --pressures      Pressure range for the RGP table
  -T , --temperatures   Temperature range for the RGP table
  -np , --n_pressures   Number of points to discretize pressure range
  -nT , --n_temperatures 
                        Number of points to discretize temperature range
  -o , --output_file    Output file name
  -me , --metastable    Turn metastable region on and off e.g. (True, False)

References

https://link.springer.com/article/10.1134/S0036024406040030 https://github.com/CoolProp/CoolProp/blob/master/doc/notebooks/Maxwell_Loop.ipynb