Unable to set refprop path

[Zachary Howard]

Hey,

I'm trying to set the refprop path so that I can use a custom mixture. When I run the following script:

import CoolProp.CoolProp as CP

CP.set_config_string(CP.ALTERNATIVE_REFPROP_PATH, r'c:\Program Files (x86)\REFPROP\\')

print CP.get_config_string(CP.ALTERNATIVE_REFPROP_PATH)

it prints and empty string indicating (I think...) that it did not change the default path. When I follow that with:

print CP.PropsSI("T","P",101325,"Q",0,"REFPROP::Water")

I get the "ValueError: Initialize failed for backend: "REFPROP", fluid: "Water" fractions "[ 1.0000000000 ]"; error: You cannot use the REFPROPMixtureBackend. : PropsSI("T","P",101325,"Q",0,"REFPROP::Water")" error.

Do you guys have any suggestions on how to fix this?

Thanks for any help!

-Zach

[Ian Bell]

That is interesting...  I can confirm that it does not return the string - that is a bug, see: https://github.com/CoolProp/CoolProp/issues/1307

On the other hand, it does seem to be picking up the variable properly, see the code below:

So it seems your refprop configuration has a different problem.  What version of REFPROP and CoolProp do you use?

import CoolProp.CoolProp as CP

CP.set_config_string(CP.ALTERNATIVE_REFPROP_PATH, '/opt/refprop/rp')

print CP.get_config_string(CP.ALTERNATIVE_REFPROP_PATH)

print CP.get_config_as_json_string()

yielding

{

    "NORMALIZE_GAS_CONSTANTS": true,

    "CRITICAL_WITHIN_1UK": true,

    "CRITICAL_SPLINES_ENABLED": true,

    "SAVE_RAW_TABLES": false,

    "ALTERNATIVE_TABLES_DIRECTORY": "",

    "ALTERNATIVE_REFPROP_PATH": "/opt/refprop/rp",

    "ALTERNATIVE_REFPROP_HMX_BNC_PATH": "",

    "REFPROP_DONT_ESTIMATE_INTERACTION_PARAMETERS": false,

    "REFPROP_USE_GERG": false,

    "REFPROP_USE_PENGROBINSON": false,

    "MAXIMUM_TABLE_DIRECTORY_SIZE_IN_GB": 1.0,

    "DONT_CHECK_PROPERTY_LIMITS": false,

    "HENRYS_LAW_TO_GENERATE_VLE_GUESSES": false,

    "PHASE_ENVELOPE_STARTING_PRESSURE_PA": 100.0,

    "R_U_CODATA": 8.3144598,

    "VTPR_UNIFAQ_PATH": ""

}

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