V =- = + A feedback control loop is used to control the temperature of a process fluid exiting a heat exchanger by manip

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V A Feedback Control Loop Is Used To Control The Temperature Of A Process Fluid Exiting A Heat Exchanger By Manip 1 (53.93 KiB) Viewed 61 times

V =- = + A feedback control loop is used to control the temperature of a process fluid exiting a heat exchanger by manipulating the flow rate of cooling water. The transfer functions of the process (Gp) and other components of the feedback loop (Gm, G v and G c) are given as: Gp = -5/(10s +1), Gm= 1.5/(3s +1), Gv=-0.05/(5s +1), Gc=Kc The process has negative steady state gain, the control valve is a linear air-to-close valve, and a proportional controller with gain K c is used. Use the direct substitution method to determine the upper limit on the value of Kc for stability of the feedback control loop с с