Coolprop in MATLAB - Critical point of binary mixtures

[alex_p]

I am using Coolprop in MATLAB with the MATLAB Wrapper.

I need to calculate the critical properties of some binary mixtures, in particular, the critical temperature and the critical pressure.

I already know that Coolprop accepts only some specific binary pairs of mixtures.

When I use the code:

CoolProp.PropsSI('Pcrit',' ',0,' ',0,'Helium[0.5]&Water[0.5]')

I have the following output from MATLAB:

Warning: No outputs were able to be calculated 

> In CoolProp.PropsSI (line 2) 

Error using CoolPropMATLAB_wrap

Failure in function PropsSI.

Error in CoolProp.PropsSI (line 2)

  [varargout{1:max(1,nargout)}] = CoolPropMATLAB_wrap(236,'_wrap_PropsSI',varargin{:});

Coolprop website give this solution to evaluate the critical points: http://www.coolprop.org/coolprop/Cubics.html#interaction-parameters

But I don't know how to use it in MATLAB.

Thanks for help.

[Ian Bell]

Hi Alex, For MATLAB, your best bet is to call CoolProp via python : https://github.com/CoolProp/CoolProp/commit/ad44738d0153d011d47cbaa4c5153ab8cb904342

That mixture in particular of water + helium is especially nasty to model, perhaps the worst possible mixture.  Because you got that warning, it is also entirely possible that this mixture does not have a critical point at this composition.  That is common for mixtures with open phase envelopes.  

You should also check out this example: http://www.coolprop.org/coolprop/Cubics.html#detailed-example .  You can call all those methods via the python interface in MATLAB.

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