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Consider the crude - oil preheater given in Figure below for different control configurations. a . Define configurations in I, II and III. Comment on
Consider the crudeoil preheater given in Figure below for different control configurations.
a Define configurations in I, II and III. Comment on all of them about difficulties in each and performances
b If the following steady state energy balance is obtained for this system,
Derive a control law to control exit temperature so that attains the desired value by measuring the disturbance variable, inlet temperature and by adjusting the heat input as the manipulated variable above its initial steady state value, ie:
Note that a control law is a relationship between the manipulated variable and the error
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