KING FAHD UNIVERSITY CHEMICAL ENGINEERING COURSE NOTES (Process Control)-Lec19

KING FAHD UNIVERSITY CHEMICAL ENGINEERING COURSE NOTES (Process Control)-Lec19

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1 Interacting vs. Noninteracting Systems Chapter 6 Consider a process with several invariables and several output variables. The process is said to be interacting if: o Each input affects more than one output. or o A change in one output affects the other outputs. Otherwise, the process is called noninteracting . As an example, we will consider the two liquid-level storage systems shown in Figs. 4.3 and 6.13. In general, transfer functions for interacting processes are more complicated than those for noninteracting processes.
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2 Chapter 6 Figure 4.3. A noninteracting system: two surge tanks in series. Figure 6.13. Two tanks in series whose liquid levels interact.
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3 Chapter 6 1 1 1 (4-48) i dh A q q dt = - 1 1 1 1 (4-49) q h R = Substituting (4-49) into (4-48) eliminates q 1 : 1 1 1 1 1 (4-50) i dh A q h dt R = - Figure 4.3. A noninteracting system: two surge tanks in series. Mass Balance: Valve Relation:
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4 Chapter 6 Putting (4-49) and (4-50) into deviation variable form gives 1 1 1 1 1 (4-51) i dh A q h dt R n n = - 1 1 1 1 (4-52) q h R n = The transfer function relating to is found by
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This note was uploaded on 09/22/2009 for the course CHEMICAL CHE 401 taught by Professor Dr.muhammadal-arfaj during the Spring '09 term at King Fahd University of Petroleum & Minerals.

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KING FAHD UNIVERSITY CHEMICAL ENGINEERING COURSE NOTES (Process Control)-Lec19

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