py.CoolPro​p.CoolProp​.PropsSI not working

Hello,

I'm working with CoolProp in Matlab. I have everything installed from Python, but when I introduce these expressions:

[v,e] = pyversion; system([e,' -m pip install --user -U CoolProp'])

py.CoolProp.CoolProp.PropsSI('T','P',100000,'Q',0,'Water')

it gives me this error:

Undefined variable "py" or class "py.CoolProp.CoolProp.PropsSI"

Last week this was working...

Some help?

Thank you.

[Bipul Krishna Saha]

Thanks its working now

Answer 1

[Mustafa Anjrini]

hello

it has happened with me too since two days i think when the CoolProp updated itself automatically to 6.4.0.

the same error massage appears when i run the command.

need help too in this issue.

thank you.

[Maria Dias]

Try this:

[v,e] = pyversion

system([e,' -m pip uninstall CoolProp'])

system([e,' -m pip install --user -U CoolProp==6.3.0'])

py.CoolProp.CoolProp.PropsSI('T','P',100000,'Q',0,'Water')

[Mustafa Anjrini]

it works

thanks alot

[Sambhav Jain]

@Maria Dias. Thank you so much it really works well.

[Ting Liang]

Hi, Maria,

Excuse me.

I am now using CoolProp in MATLAB and Simulink, it is to transfer temperature vector from Simulink(Simulink model, picture1) to MATLAB(Matlab model, picture2), and then call for CoolProp to calculate the thermal properties of air (Temperature range 80 - 300 K, Pressure 10 MPa, supercritical region), but every time when I run the whole simulink model, it always reported the error shown as picture3.

Could you please tell me what's the problems? How to deal with this problem?

Thanks, and looking forward to your reply.

Best regards

Answer 2

[Ben Adams]

Hello--

It seems all versions of python/coolprop do not work in Matlab 2019b. For instance, matlab does not support python version 3.8 yet.

The versions that worked for me were Python 3.7.3, CoolProp 6.2.1, Matlab 2019b. Coolprop 6.4.0 did not work, nor did python 3.8.

[José A. Almendros-Ibáñez]

For me is working under Matlab R2020a with Python 3.7.3. and CoolProp 6.4.0.

With Python 3.8 it does not work.