TUGAS KELAS
1. The temperature of an endothermic reactor is controlled by manipulating the flow rate of steam flowing through a jacket around the reactor.
(a) Using your physical understanding of the process, determine the sign of process gain Kp.
(b) If the control valve for steam flow be air-to-close, determine whether the controller is direct acting or reverse acting.
2. Hot water (sp.gr.=1) is pumped through the tube side of a shell and tube heater and a control valve at a nominal flow rate of 50 m3/h. The total pressure drop over the
entire system is constant at 1.5 barg. The pressure drop over the heater is proportional to the square of the flow rate and is 0.5 barg at the nominal flow rate. The control valve are set so that f(l) = 0.5 at the nominal flow rate. Using control valve with square root trim specify the value of Cv and determine valve position for the flow rate
of 60 m3/h.
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TUGAS KELAS
1. The temperature of an endothermic reactor is controlled by manipulating the flow rate of steam flowing through a jacket around the reactor.
(a) Using your physical understanding of the process, determine the sign of process gain Kp.
(b) If the control valve for steam flow be air-to-close, determine whether the controller is direct acting or reverse acting.
2. Hot water (sp.gr.=1) is pumped through the tube side of a shell and tube heater and a control valve at a nominal flow rate of 50 m3/h. The total pressure drop over the
entire system is constant at 1.5 barg. The pressure drop over the heater is proportional to the square of the flow rate and is 0.5 barg at the nominal flow rate. The control valve are set so that f(l) = 0.5 at the nominal flow rate. Using control valve with square root trim specify the value of Cv and determine valve position for the flow rate
