1 reply to this topic

[Ali Z]

I am simulating a centri. compressor via Aspen One. I know how to do this in general, but want to clear up a confusion.

I have two types of performance curves from manufacturer: Pressure Ratio vs Std Flow  and  Pressure Ratio vs Actual Flow.

Aspen One gives two options to you for specifying curves: Mass Flow and Actual Vol Flow. 

 

Assuming an ideal gas and using the given inlet MW, I can just convert the Std Flows from curves to Mass flows and then use them in Aspen One, right? So I am a bit confused as to why both curves are given to me by the manufacturer? Cuz if I use the mass flow curves in Aspen the discharge pressure would become independent of inlet condition, but if I use the actual flows, the discharge pressure would change with a change in inlet condition (assuming all else the same; aka same flow and speed for all cases). 

 

Thanks a lot for addressing the point only.

[PaoloPemi]

when solving these problems (I have Prode but same procedures) you can cimply convert from standard to actual conditions, see for example

 

https://pdfs.semanti...9294e593c04.pdf