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DJF16-Pearl
16-Pearl
April 27, 2019
Solved

Minimize problem

  • April 27, 2019
  • 2 replies
  • 1805 views

Attached is a little problem in 4.0 that has me stumped - not sure how to set it up to solve.  

The problem is for a pump - which we know performance of.  I need to find the speed to deliver the required flow and pressure must exceed the requirement (it can be higher) and the speed should be such that the consumer power is lowest while meeting the flow & pressure needs.  Since efficiency/flow/head curves vary it's possible that the lowest power speed delivers more pressure than necessary, but does so efficiently.

 

Everything works up to the solve block, and despite many attempts I can't figure out how to formulate it.

Thanks,

Best answer by Werner_E

Are you looking for something like this:

B2.png

2 replies

W
Werner_E25-Diamond I
25-Diamond I
April 27, 2019

You define DeltaP.act as a function of N2 but you define it as being constant 100 psi.

DeltaP.goal is defines as 500 psi.

So you demand Prime to find a solution with the constraint 100 psi > 500 psi ???

B.png

W
Werner_E25-Diamond IAnswer
25-Diamond I
April 27, 2019

Are you looking for something like this:

B2.png

D
DJF16-PearlAuthor
16-Pearl
April 27, 2019

Yes, thank you.  It was just a question of setting it up right.  In between what to have as a guess, definition and constraint I always got errors or "No solution".  It always looks simple once you see the solution.

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