Professionally I work at BPT and focus on creating value adding App for Process Simulation. You can find more info on those on the BPT website. Below are posts that should help HYSYS, PetroSIM and UNISIM users alike in their day to day challenges to produce accurate yet fast models efficiently.

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Thursday, 12 June 2008

Optimize your use of Utilities

Utilities provide useful information about streams in your flowsheet. However sometimes utilities are time consuming in their execution. So, if if you have a flowsheet with recycles or adjusts, you'd better avoid these being executed every time you go through your recycle or adjust loops. So how do you do that?

Open up the HYSYS workbook
In the menus, select Workbook / Setup
Add a new page and select as a type simply the general Utility entry
The list of variables doesn't contain what we want, so remove all variables
Click Add and add the Calc Level variable
We are done here
Go to the workbook and set all the calc levels of all utilities equal to 1e6 or so
This will ensure that utilities are executed as late as possible in the execution sequence

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