Oxygen transfer rate

Hi,
How can I determine the oxygen transfer rate (OTR) under operating conditions in an ASU? There is the Kla measurement, but not the OTR.

Thank you
Iacopo

I would use a [b]Calculator Variable[/b]. Or, better, in 2017, a top-level state variable.
Have you tried?

Ok, I try with a calculator variable.

Another question:  How is the "Aeration Energy" calculated by the software? and "Mixing Energy"?

Thanks
Iacopo

You should be able to see the underlying expressions in the Models Guide (F1 from WEST).