The control systems of an ideal HIDiC are studied. It is found that the process has strongest interaction when q, the feed thermal condition, equals 0.5, and system resilience may also be degraded when q is departed from 0.5 due to strong gain directionality. Furthermore, placing feed in the middle of the process could intensify the interaction, therefore, the determination of both q value and feed location should be based on careful compromise between steady state energy saving and dynamic resiliency of the system.
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