M11.4. Batch Model 3: Cascade Control
The process model, if the jacket make-up flow rate is the manipulated input, is
Equation M11.12
As written, this assumes that the jacket is a “once through” flow and that there are cold and hot jacket feed streams. It can also be shown that a jacket recirculating heat-transfer system has the same model equations, where the jacket mass flow rate is simply the make-up flow to the recirculating jacket heat-transfer system [compare Equations (M8.11) and (M8.12) for a CSTR]. Here a split-range control strategy would be used, with either the cold or hot fluid stream admitted to the jacket, depending on the split-range ...
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