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How to interpret the data in CO2TAB file

CO2TAB

I am trying to model temperature perturbation during CO2 injection in saline aquifer using TOUGH3/ECO2N. My INFILE is modified after the INFILE of "rcc3" sample case. I have to provide the enthalpy of the injected CO2 in GENER data block. I opened CO2TAB to get the enthalpy of CO2 at the injection conditions, however, I couldn't interpret the input data in CO2TAB file.  Can anyone help me interpret the data in this file (i.e. How can I read CO2 density, viscosity, and enthalpy at any pressure and temperature?)

3 replies

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    • yqzhang
    • 4 yrs ago
    • Reported - view

    CO2TAB is a look-up table providing in the sequence: pressure, temperature, viscosity, density and enthalpy with multiple entries. It is best to write a code and read the numbers. However, it is much easier if you check somewhere else, for example, NIST webbook is a good resource: https://webbook.nist.gov/

    Yingqi

      • kunqing_jiang
      • 2 yrs ago
      • Reported - view

      Yingqi Zhang 

      Hi Yingqi Zhang,

      I want to simulate CO2 injection at constant temperature by setting an infinite density to the injection well. However I don't know how to calculate the enthalpy of injected CO2. I think I can use the temperature and pressure recorded in the FOFT file to calculate the enthalpy by looking up a table, such as the NIST webbook. But the reference state parameters for CO2 are unknown. Do you know the reference state in eco2n? 

    • Keurfon_Luu
    • 4 yrs ago
    • Reported - view

    Note that rcc3 sample problem is running isothermally. Don't forget to modify the second parameter NEQ in block MULTI to disable the isothermal option: 

    MULTI----1----*----2----*----3----*----4----*----5----*----6----*----7----*----8
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