CPC 456
Revision Problems - Final
1. The dynamic behaviour of a pilot scale absorption process has been approximated by the transfer
function model:
G (s)
y # ( s ) 0.025
u # ( s ) 1.5s 1
Where y#(s) is the deviation of S02 concentration from its nominal
Revision problems for Exam 1
CHE 456
1. Problem 2.1 from text book
2. Problem 2.2 from text book
3. Problem 2.6. from text book
4. Problem 3.4 from text book
5. Problem 3.5 from textbook
6. Problem 3.6 from the text book
7. Problem 3.7 from text book
8. P
Revision problems for Exam 1
CHE 456
3.4
a)
f(t) = 5 S(t) 4 S(t-2) S(t- 6)
F (s ) =
1
5 - 4e - 2s - e -6s
s
b)
x(t)
a
x1
a
x4
tr
2tr
3tr
-a
-a
x2
x3
x(t) = x1(t) + x2(t) + x3(t) + x4(t)
= at a(t tr)S(t tr) a(t 2tr)S(t 2tr) + a(t 3tr)S(t 3tr)
following Eq.
CHE 456: Process Dynamics and Control.
School of Dynamics and Control.
CHE 456: Process Chemical Engineering,
School of ChemicalUniversity
Purdue Engineering,
Purdue University 1
Problem set
Fall 2014 Problem set 1:
Due on 09/18/2014 Hand in at beginning
Revision problems for Exam 2
CHE 456
4.15
Assume:
1. Constant physical properties
2. Perfect mixing
3.
Dynamic model: Balances on cell mass and substrate concentration
dX
( S ) X DX f1 ( S , X , D)
dt
dS
( S ) X / YX / S D( S f S ) f 2 ( S , X , D, S f
Revision problem for Exam 2
CHE 456
Q1.
An irreversible chemical reaction A B occurs with second-order kinetics in a
continuous reaction vessel, as shown below. The feed contains a
concentration C0 t and is supplied at an unsteady volumetric flow rate of