thank you very much!
Coming back to the error message ... I am sorry ... this behaviour is not something I expected ...
Please don't be mad ... just would love some more help thank you for your patience =)
If InformationCalculator_1113 has a pressure input of 0.03 bar it should have (or I expect it to have, hehe) as output also 0.03 bar since the outputs are equal to the input...
So the info calculator seems to not be working properly?
now ...
you state that ..."The pressure is undetermined as stream 20 has a zero flow rate"
comments:
-pressure on stream 20 is 41.65 bar (not undetermined)
-pressure on stream 21 is 0.03 bar (not undetermined)
-flow rate is 0 because the bypass was activated ... so the flow was reduced to 0 but the pressure still remains on these lines (and the flowsheet still shows them on green correctly)
and...
"This in turn seems to be controlled by Bypass Active2. Please check this setup?"
...this is correct, when I activate the bypass (by changing from zero to 1) the steam flow is reduced to zero (by sending to other equipment) but the pressures of the equipment are maintained. (Please see NOTE1 below for a different approach on explaining this)
...and the value of this pressure should be the same for PV-900A (0.03 bar).
... what I am trying to say is ... all equipment should always have a pressure no matter if you have positive or no flow... the flow was simply reduced until it got to zero ... but its property pressure should remain with the same value.
NOTE1: You can also see that the flowsheet can calculate with zero flow if you calculate the flowsheet with bypass deactivated (=0) and start increasing to 0.5, then 0.9 and then slow increments until you get to one (i believe it was 0.99 then 0.999 then 1)
As described ... you can calculate it with increments but if you save it and try to open the calculated file it will now show the error and not calculate the previously calculated sheet.
Please if you don't agree with something please tell me =) ... would you agree that the pressure should not be undetermined?
Can this be fixed so that it no longer shows the error and instead calculates everything? (perhaps for future versions if it isn't easy to program)
Thanks for all the help !Statistics: Posted by iqgustavo — 04 August 2016, 19:13
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