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Tuning and Control Loop Performance, Fourth Edition, 4th Edition by Gregory K. McMillan

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APPENDIX F

FIRST PRINCIPLE PROCESS RELATIONSHIPS

GENERAL IMPLICATIONS

First principle relationships can define process cause and effects that can lead to improved controller tuning and performance by the selection of better tuning rules and process variables for scheduling of tuning settings. It also affects the choice of control valve trim and the feedforward design. Understanding these relationships does not require a degree in chemical engineering but presumes just some understanding of common terms (e.g., heat transfer coefficient and area), relationships (e.g., ideal gas law), and physical concepts (e.g., conservation of mass and energy).

Equations have been developed from first principle relationships for the process gains, dead times, ...

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