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Continuously stirred tanks have an extensive use in chemical processes. They are often supplied with some sort of heat exchange system. If the tank is
Continuously stirred tanks have an extensive use in chemical processes. They are often supplied
with some sort of heat exchange system. If the tank is used for a chemical or biochemical reaction it
is often important to keep a certain temperature to obtain desired productivity. A continuously
stirred tank with a common type of heat exchange system is shown in the Figure below. The tank is
surrounded with a heatingcooling layer in which a liquid flow through to heat or chill the liquid in
the tank.
A Determine the important signals of the system. Suggest a control strategy based on feedback
and draw the block diagram.
B To be able to construct and evaluate different controllers it is necessary to have a process
model. Determine a dynamical model for this system. Assume that the volumes in the tank and
in the heat exchange system are constant.
C Linearize the model at the equilibrium point:
D The parameters of the model are as follows.
Cmin
Determine the transfer function from flow in the heat exchange system to the temperature in
the tank.
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