(Note: Please upload an image of block flow diagram; it is much easier to read actual handwriting than Chegg's User Interface)

Common controls systems used in the CPI often combine flow control with temperature control where one loop provides the setpoint for the second loop as shown in the figure below:

a) For the shown P&ID diagram, develop a block flow diagram for distillation control:

b) For the Transfer function listed below:

Determine the closed loop stability, assuming the process models for the primary and secondary loops are:

With the time constants = and = and the controller transfer functions () = and () = .

c) For what values of and is the system unstable?

D(s)Y(s)=1+Gcs(s)Gps(s)+Gcp(s)Gpp(s)Gcs(s)Gps(s)Gd(s)Gpp(s) Gpp(s)=s+11.0Gps(s)=rs+11.0r=pspp