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How To Change Flow Rate In Dynamic State In Unisim ?


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#1 processengineer2018

processengineer2018

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Posted 07 December 2017 - 07:06 AM

As because pressure is active specification, flow rate stick on one. I wanted to give new flow rate, but when process is running it is again going back to the first flow rate. So I can change flow rate in dynamic to try different flow rates for my flow sheet ? for example if it is simple feed stream of nitrogen and oxygen passing through compressor to cool done . So pressure is 200 bar, temperature 100 K. Starting flow rate was 10kgmole per hour. Now I want to do at 20, but it is impossible to change it. 



#2 ELVINA

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Posted 27 February 2018 - 07:24 AM

Hi!
you cannot change it in such rude way. it is impossible. You can change parameters of your system (e. g. k value of valves) to change flow rate. but you cannot change pressure and flow rate simultaneously. you can understand reasons of it from pressure-flow equations



#3 Technical Bard

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Posted 27 February 2018 - 10:11 PM

Increase the source pressure, open a control valve.  That is how it happens in the real world.






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