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Offline Valentino  
#1 Posted : 01 May 2021 15:59:24(UTC)
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hi Thank you does anyone know how to create a graph with a logarithmic scale on the "Y" axis? I want to make an enthalpy vs pressure diagram, has anyone already made a Mollier diagram? constant entropy lines are costing me a lot of work. Thanks for your attention




PH.sm (215kb) downloaded 11 time(s).
Offline PompelmoTell  
#2 Posted : 01 May 2021 18:54:04(UTC)
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You can do with the Zedgraph plugin

sergio

PH_sergio.sm (247kb) downloaded 11 time(s).

thanks 1 user thanked PompelmoTell for this useful post.
on 06/05/2021(UTC)
Offline EngMath  
#3 Posted : 01 May 2021 19:19:22(UTC)
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Maxima plug-in should work too.
Offline overlord  
#4 Posted : 01 May 2021 19:26:36(UTC)
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Integrated 2D plot should work too.
Same can be said for XY-Plot plugin.
With a little trick of course.

logarithmic_plot.sm (14kb) downloaded 5 time(s).

2021-05-02_12-52.png

Edited by user 02 May 2021 12:53:21(UTC)  | Reason: Not specified

Offline Valentino  
#5 Posted : 06 May 2021 13:08:18(UTC)
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Originally Posted by: PompelmoTell Go to Quoted Post
You can do with the Zedgraph plugin

sergio

PH_sergio.sm (247kb) downloaded 11 time(s).



Sergio, thank you very much for answering Clap

The logarithmic scale worked perfectly, however, the lines that it draws are somewhat wavy, as if there is noise and they are separated,
is there any way that the line is smoother and more united? Also, when I use ZG, how can I name the lines? I entered all the tempperature
and entropy data manually

thank you very much for your attention Biggrin
My English is not very good, I hope you can understand me Victory

Mollier ZG.png

Mollier ZG LS.png

file
PH R22.sm (182kb) downloaded 4 time(s).
Offline Valentino  
#6 Posted : 06 May 2021 13:26:24(UTC)
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Originally Posted by: overlord Go to Quoted Post
Integrated 2D plot should work too.
Same can be said for XY-Plot plugin.
With a little trick of course.

logarithmic_plot.sm (14kb) downloaded 5 time(s).

2021-05-02_12-52.png


Thanks for answering, your method is very helpful.
Do you know how I can enter text for the graph lines? I entered all the temperature and entropy values manually,
I would like the text to be on the lines or on one side of the line without having to enter them as a text region.

thanks for your attention LOL
I don't write in English, I hope you understand me Yes

Mollier ZG.png

PH R22 Q.sm (180kb) downloaded 11 time(s).
Offline Jean Giraud  
#7 Posted : 06 May 2021 20:44:11(UTC)
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You can view all at once on collected Mollier.

PH R22 Q Mollier.sm (62kb) downloaded 8 time(s).
Offline overlord  
#8 Posted : 06 May 2021 21:59:12(UTC)
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Originally Posted by: Valentino Go to Quoted Post
Thanks for answering, your method is very helpful.
Do you know how I can enter text for the graph lines? I entered all the temperature and entropy values manually,
I would like the text to be on the lines or on one side of the line without having to enter them as a text region.

thanks for your attention LOL
I don't write in English, I hope you understand me Yes

In 2D-plot and XY-plot there is a method to enter text or some marks into the graph.
Don't have any idea if this works with Zed graph.
I don't have it and I have no intention to install it.
Below you can see a simple demonstrated answer to your question.
There is also a lot of detailed information for plotting in Reference book.

Regards

logarithmic_plot_withtext.sm (33kb) downloaded 16 time(s).

2021-05-06_21-51.png
Offline Jean Giraud  
#9 Posted : 13 May 2021 03:15:04(UTC)
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Originally Posted by: Valentino Go to Quoted Post
has anyone already made a Mollier diagram? constant entropy lines are costing me a lot of work. Thanks for your attention

An horrible task for the first model from you data.
The principle is quite involved but works.
M8, M9, M10 do NOT cinterp ... confirmed Mathcad
Quadratic acceptable M9 ... M8 poor ... M10 OK
More work to conclude is needed ... as is reconciliation.
the FREAK is not done
Cheers ... Jean

Project Mollier IDX part.sm (164kb) downloaded 3 time(s).

The all difficulty results from poor/unwisely collected data.



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