Re: [foxboro] Steam FLow Calc
- From: "Matic.Hank" <Hank.Matic@xxxxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 20 Apr 2005 10:03:55 -0500
If you want the flow with density compensation you get this data if you
the physical properties library loaded on your system you can get the
density from that , you will need to write C program to get this data ,
so you might just as well do the entire thing in that program.=20
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of BrianLong
Sent: Wednesday, April 20, 2005 9:29 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Steam FLow Calc
yes, I should have mentioned I need compensation. Using CHAR blocks is
a good thought and I may try that. It will most likely be better than
what I'm doing now. Not sure Foxboro offers, Alex?
Thanks,Brian
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx
[mailto:foxboro-bounce@xxxxxxxxxxxxx]On Behalf Of Gregory A Hurwitt
Sent: Wednesday, April 20, 2005 8:18 AM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] Steam FLow Calc
Are you doing mass flow compensation? If so, are you doing it with the
standard compensation term: sqrt ((P/P0)*(T0/T))? This compensation
equation is based on the ideal gas law, and steam does not make a good
ideal gas.
For steam mass flow compensation we have on occasion done a "two-way"
characterization where we set up two CHARC blocks to give separate
compensation factors for pressure and temperature over a range of
interest.
It's cumbersome, and it's only accurate over a limited range, but it's
better than ideal gas compensation for steam.
Does Invensys still offer a physical properties package for I/A? Does
it include compensation factors for steam? This might be a good
solution.
Greg Hurwitt
BASF Freeport
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| | |"BrianLong" <blong@xxxxxxx> |
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We are using a CALC block to calculate steam flow. The calculation is
not as accurate as I'd like. Does anyone have an accurate "standard"
way to calculate steam flow in K# / HR.
Thanks,
Brian Long
Arkansas Kraft
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