Re: [coolprop-users] Ploting saturation curve in matlab

[Ian Bell]

Hi Igor,

Your best bet is to do something like this (pseudocode):

Ts = linspace(Ttriple, Tcrit)

for (i = 0; i < len(Ts); ++i)

    ps = CoolProp.PropsSI('P','T',Ts[i],'Q',0,'R245fa')

end for

Or use python, these things are trivial in python.  And python is a far better overall programming environment than MATLAB.  Also, it's free.

On Fri, Apr 24, 2015 at 5:39 AM, Igor Blazinic <blazin...@gmail.com> wrote:

I'm working on a student projekt of ORC (organic Rankin cycle).

I don't know how to plot saturation curve in matlab using coolprop.

In a folder that I downloaded, there are not folder "coolprop.plots" or something like that.

Where can I find it, or is there another way to plot saturation curve of some fluid?

Igor

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[mathieu...@gmail.com]

Hi,
I succeeded to plot the saturation curve on MATLAB but I just want to know the Tcrit and Ttriple.
I manage to calculate it by this way :

Tcrit=CoolProp.PropsSI('Tcrit',R134a);

The error message is :

Warning: function PropsSI requires at least 6
arguments
??? Error using ==> CoolPropMATLAB_wrap
Failure in function PropsSI.

I don't understand why. Just the fluid is needed to calculate Tcrit.

Thank you

[Jorrit Wronski]

Hi,

it looks like overloading does not work, try
Tcrit=CoolProp.PropsSI('Tcrit',’’,0,’’,0,’HEOS::R134a’)
and you should be fine.

Jorrit

On 08/05/15 17:24, mathieu...@gmail.com wrote:
> Hi,

> I succeeded to plot the saturation curve, But I juste want to know the

> Tcrit and Ttriple.
> I manage to calculate it by this way :
>
>

> Le vendredi 24 avril 2015 11:22:24 UTC-4, Ian Bell a écrit :
>
> Hi Igor,
>
> Your best bet is to do something like this (pseudocode):
>
> Ts = linspace(Ttriple, Tcrit)
> for (i = 0; i < len(Ts); ++i)
> ps = CoolProp.PropsSI('P','T',Ts[i],'Q',0,'R245fa')
> end for
>
> Or use python, these things are trivial in python. And python is a
> far better overall programming environment than MATLAB. Also, it's
> free.
>
> On Fri, Apr 24, 2015 at 5:39 AM, Igor Blazinic <blazin...@gmail.com
> <javascript:>> wrote:
>
> I'm working on a student projekt of ORC (organic Rankin cycle).
>
> I don't know how to plot saturation curve in matlab using coolprop.
>
> In a folder that I downloaded, there are not folder
> "coolprop.plots" or something like that.
>
> Where can I find it, or is there another way to plot saturation
> curve of some fluid?
>
> Igor
>
--

Jorrit Wronski
DTU Mechanical Engineering

Technical University of Denmark
Department of Mechanical Engineering
Nils Koppels Allé
Building 403 Room 105
2800 Kgs. Lyngby

phone: +45 45 25 41 83
email: jo...@mek.dtu.dk
http://www.mek.dtu.dk/english/Sections/TES

[Leonardo Otávio]

Hey, could you help me implement this in python? I'm still learing this environment :)

On Friday, April 24, 2015 at 12:22:24 PM UTC-3, Ian Bell wrote:

Hi Igor,

Your best bet is to do something like this (pseudocode):

Ts = linspace(Ttriple, Tcrit)

for (i = 0; i < len(Ts); ++i)

    ps = CoolProp.PropsSI('P','T',Ts[i],'Q',0,'R245fa')

end for

Or use python, these things are trivial in python.  And python is a far better overall programming environment than MATLAB.  Also, it's free.

On Fri, Apr 24, 2015 at 5:39 AM, Igor Blazinic <blazin...@gmail.com> wrote:

I'm working on a student projekt of ORC (organic Rankin cycle).

I don't know how to plot saturation curve in matlab using coolprop.

In a folder that I downloaded, there are not folder "coolprop.plots" or something like that.

Where can I find it, or is there another way to plot saturation curve of some fluid?

Igor

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[Ian Bell]

Hopefully this gets you started:

import numpy as np
import CoolProp.CoolProp as CP
import matplotlib.pyplot as plt
fld = 'R245fa'
Ttriple, Tcrit = [CP.PropsSI(fld, k) for k in ['Ttriple','Tcrit']]
Ts = np.linspace(Ttriple, Tcrit)
ps = CP.PropsSI('P','T',Ts,'Q',0,fld)
plt.plot(Ts, ps)
plt.show()

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