How to use the solve function in this task

#1 Posted: 6/2/2024 8:33:38 PM

Valery Ochkov

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3-2-CoolProp-Solve.sm (46 KiB) downloaded 64 time(s).

#2 Posted: 6/2/2024 10:24:24 PM

ioan92

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Group: User

Take care :

Your CoolProp function, as you write it, does not change the sign, between the two limits of the variable p :

2024-06-02 17_15_56-SMath Solver - [3-2-CoolProp-Solve.sm_].png

Do to others as you would like them to do to you! Knowledge is of no value unless you put it into practice - Chekhov

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Valery Ochkov 6/2/2024 11:27:00 PM

#3 Posted: 6/2/2024 11:27:35 PM

Valery Ochkov

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Thanks,
send please the sm-file with the solution

#4 Posted: 6/3/2024 12:42:55 AM

ioan92

171 likes in 102 posts.

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Hi,

The problem, as you formulated, seems as not having a solution in real numbers, in order to be solved with the solve routine.

I'm sorry but I have no time to reformulate your problem.

If you intend to solve it numerically, try to check the continuity of the function and the fact that in the range you look for solution there is at least one change of the function value sign.

Do to others as you would like them to do to you! Knowledge is of no value unless you put it into practice - Chekhov

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Valery Ochkov 6/3/2024 12:59:00 AM

#5 Posted: 6/3/2024 1:46:02 AM

Martin Kraska

1222 likes in 2150 posts.

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The problem as stated in the opening post, actually has a solution in the given range.

Yet, I don't see an alternative to using brute force to tame the coolprop function: sampling and interpolation.

File not found.File not found.

Martin Kraska Pre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx

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Valery Ochkov 6/3/2024 1:50:00 AM

#6 Posted: 6/3/2024 2:12:41 AM

Alvaro Diaz Falconi

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Hi. The guess values, in this case the range, are part of the solution, this means that you must know where the numerical procedure works fine. In this case the interval 1 MPa ... 6 MPa.

3-2-CoolProp-Solve.sm (49 KiB) downloaded 64 time(s).

Best regards.
Alvaro.

#7 Posted: 6/3/2024 10:47:51 AM

Valery Ochkov

55 likes in 633 posts.

Group: User

Thanks, Martin and Alvaro
See please the problem in attach
Fireless-Locomotive.sm (882 KiB) downloaded 55 time(s).

PS
Alvaro!
And what about the book?

#8 Posted: 6/3/2024 12:58:22 PM

Alvaro Diaz Falconi

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Group: User

Hi Valery. This could be an option.

Fireless-Locomotive.sm (915 KiB) downloaded 61 time(s).

Wrote
...
PS
Alvaro!
And what about the book?

I'm pretty busy right now! Sorry.
Alvaro.

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Valery Ochkov 6/3/2024 4:04:00 PM

#9 Posted: 6/3/2024 4:29:42 PM

Valery Ochkov

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It works! By p.0=240 atm
Fireless-Locomotive.sm (882 KiB) downloaded 61 time(s).
But by p.0=140 atm ---???

Alvaro>

Check please 1-2-3 chapters.
My student from Cuba is waiting for it!

#10 Posted: 6/5/2024 9:16:15 PM

Alvaro Diaz Falconi

992 likes in 1675 posts.

Group: User

Wrote
... Check please 1-2-3 chapters.
My student from Cuba is waiting for it!

Hi Valery. I find it quite inappropriate that what is a voluntary collaboration helping on regarding a translation, and therefore supposedly free of commitment on both sides, is publicly claimed in the forum. This situation seems to reflect some type of irresponsibility on my part as I am failing to make some type of commitment, which, I insist, there is none. I would sincerely like to receive some kind of explanation as to why you are making a public complaint about a translation job on my part when there is no agreed commitment.

Best regards.
Alvaro.

#11 Posted: 6/5/2024 11:25:56 PM

Valery Ochkov

55 likes in 633 posts.

Group: User

Please forgive me, of course I'm wrong.
Regards,
Val

#12 Posted: 6/6/2024 12:18:58 AM

Alvaro Diaz Falconi

992 likes in 1675 posts.

Group: User

Of course. He is already forgotten.

Best regards.
Alvaro.

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