Question
Two components are being mixed in a CSTR and w_(2) ) with constant liquid holdup. Each stream has an initial temperature but stream 2(w_(2)) has
Two components are being mixed in a CSTR and
w_(2)
) with constant liquid holdup. Each stream has an initial temperature but stream
2(w_(2))
has fluctuations over time (a disturbance). The outlet temperature is meant to be controlled
(T_(sp))
by using a control valve to alter stream 1
(w_(1))
.\ a.) (10 pts) What is the equation that shows the mass flow rate of our controlled stream
(w_(1))
that gives the corresponding set point temperature
(T_(sp))
? Have your answer in terms of
T_(sp),T_(1),T_(2),w_(1)
and
w_(2)
.\ The overall mass balance is given as:\
0=w_(1)+w_(2)-w
\ The overall energy balance is given as (assuming the leat capacities are equal:
C_(1)=C_(2)=C
):\
0=w_(1)T_(1)+w_(2)T_(2)-wT
\ b.) (10 pts) How would you control this system? Include in your description how you would process the variations in the temperature of stream 2. Briefly explain the reasoning behind your design.\ c.) (10 pts) Draw a process control block diagram of the system you explained in part b.). Include relevant components and process flows.
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