The Three Reservoir Problem Revised In Prime

[MBuck2]

I converted an old Mathcad 12 template to MC Prime 2 see attached but for some reason the solve block is not returning a solution. Can anyone see the problem - is it something to do with units or has the solve block been set-up incorrectly for Prime?

Regards, Mark

[VladimirN]

Hi Mark,

Can you upload your instant worksheet for Mathcad 12?

[MBuck2]

Vladmir;

That's my problem I cannot find the original version 12 file. I converted this some time ago and it would appear that I have changed some key aspects from the original but the methodology looks sound to me.

[Werner_E]

Mark Buckton wrote:

Vladmir;

That's my problem I cannot find the original version 12 file. I converted this some time ago and it would appear that I have changed some key aspects from the original but the methodology looks sound to me.

Could it be the one of yours in this thread?

http://communities.ptc.com/message/30412#30412

[MBuck2]

No that is still not the original file version 12 file that is an altered version that I was playing with but never completed.

[Werner_E]

Mark Buckton wrote:

No that is still not the original file version 12 file that is an altered version that I was playing with but never completed.

Just thought as that old file show the same error of Z.i not being functions as your Prime worksheet

[AlanStevens]

Within the Solve block shouldn't ZA be Z(QA), ZB be Z(QB) etc?

Alan

[MBuck2]

Alan;

What you suggest is logical and I have done what you have suggested but now Mathcad is complaining that Ep needs to be a function but a function of what? It cannot be a function of flow rate as there are 3 independent flow rates? Any more suggestions?

Mark

[AlanStevens · Accepted solution]

Have a look at the attached.

Alan

[MBuck2]

Alan;

It appears I done what you had suggested but there must be a typo in my sheet - somewhere. Thank you. It now seems that the answers (flow rates) that are being generated are not plausible but that is another matter which I am now investigating,

Regards, Mark

[Werner_E]

Mark Buckton wrote:

Alan;

What you suggest is logical and I have done what you have suggested but now Mathcad is complaining that Ep needs to be a function but a function of what? It cannot be a function of flow rate as there are 3 independent flow rates? Any more suggestions?

Mark

You probably forgot to change Z.A for Z !?