Phases in javascript coolprop

[Bart de Waal]

Hi,

I'm using the javascript/wasm version of coolprop.

Whenever I need a phase, I get a number.

Is it possible to change these to text using the javascript/wasm version?

Or even better, is there somewhere in the documentation where all phases are listed with the associated number? I would hope this is stable between versions.

I tried to find this in the documentation, but I couldn't find a listing or a function that works with the wasm library I found.

Kind Regards,

Bart de Waal

[Ian Bell]

There is the PhaseSI function, also methods for programmatic lookup of phase enumerated values

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[Ian Bell]

Like these ones:

import CoolProp
print(CoolProp.CoolProp.get_phase_index('phase_gas'))
print(CoolProp.CoolProp.get_phase_index('phase_liquid'))
print(CoolProp.CoolProp.get_phase_index('phase_supercritical_gas'))

yielding

5
0
2

You should not rely on the values staying fixed, rather you should look up the enumerated values at the beginning of your script.

[David Contreras]

I had to do some reverse engineering and found the following corresponding values.

const phases = ["liquid", "supercritical","supercritical_gas", "supercritical_liquid","critical_point","gas", "twophase",

"unknown", "not_imposed"]

Then made some function like this to convert the number to the correct string.

function phaseSI(prop1, value1, prop2, value2, fluid){

return phases[Module.PropsSI('Phase', prop1, value1, prop2, value2, fluid)]

}

[Ian Bell]

Did you see the code I posted above? That is how you should approach it.  The numerical codes are not guaranteed to be stable.

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[David Contreras]

I did validate with this python code:

import CoolProp as cp

phases =  ["liquid", "supercritical","supercritical_gas", "supercritical_liquid","critical_point","gas", "twophase",

               "unknown", "not_imposed"]

for phase in phases:

  print(cp.CoolProp.get_phase_index('phase_'+phase))

And this was the result:

0 1 2 3 4 5 6 7 8

Maybe a better way could be to have phases as a dictionary instead of a list.

phases = {0:"liquid", 1:"supercritical", 2:"supercritical_gas", 3:"supercritical_liquid", 4:"critical_point", 5:"gas", 6:"twophase",

               7:"unknown", 8:"not_imposed"}

[Ian Bell]

You might want to consider adding an accessor to get_global_param_string to get the list of phases like is done for parameters: https://github.com/CoolProp/CoolProp/blob/71a82276ffd1d19bc886b0377b9838468ef0ace2/src/CoolProp.cpp#L989

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[David Contreras]

Hi, I recently made an example function that works with units.

Please take a look.

https://github.com/dvd101x/CoolPropJavascriptDemo

[Ian Bell]

Nice work! Want to add a link to the main page?

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[David Contreras]

Yes, that would be nice!

[Naveed Ullah]

Hi Mr Ian Bell

I'm master student and new to coolprop user

can you help me resolving the problem regarding attached errors

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[Ian Bell]

This is not the place to ask this question.   Please create a new thread,  or open an issue on github. 

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