Aspen Touch Solutions ATM-123R Series Specifikace Strana 333

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Aspen Custom Modeler Operation 7-19
7-19
ACM Op. If your model does not have dynamics behaviour or
you require maximum calculation speed and optimal
performance from your ACM Op, you can select the Use Steady
State ACM Model radio button to have your model operating in
steady state mode. For dynamics mode you can select the Use
Dynamics Model radio button. Once you select dynamics mode
for your model, the ACM Integration Step Size field appears, and
you can specify a fixed integration time interval.
ACM Specs Page
The ACM Specs page allows you to fix the pressure-flow
variables for the inlet and outlet ports when the ACM Op is being
solved. The checked variables are treated as constants in
dynamics mode so that the model will have zero degree of
freedom. For a typical model, the default option is to fix the inlet
pressure and flow, which are updated with the values obtained
from the HYSYS feed stream. The ACM Op will then calculate the
outlet flow and pressure. Thus, generally the outlet pressure
and flow are not fixed.
The ACM Integration Step Size is set to 0.1 seconds by
default.
For dynamics mode you need to fully specify the ACM Specs
Page and PF Specs Page.
The HYSYS and ACM model are not solved simultaneously.
This may cause instabilities within the model in dynamics
mode. To maintain stability, you can reduce the integration
step size (of both HYSYS and the ACM model), apply
intelligent damping inside the ACM model, and add vessels or
volumes around the ACM Op depending on the version of
AES.
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