6.5
Based on the process measurements,
there are 5,000 Ib/h more flow for the
process leaving the heat exchanger than the feed rate to the heat exchanger; therefore, the
material balance for the process fluid does not close.
The reason for this discrepancy
could be faulty flow sensor readings or possibly a leak of the condensate or steam into the
process stream.
6.12
a)Closed
b)open
c )open
Id)closed
I
7.3
(a)
lliQJ
The equations
have
no solution
 theyareparallellines.
The rank of the coefficient matrix is only I because the
f1 21
detll
2J=0
The rank ofthe
augmented matrix is 2
P
2
11
Largestnon zerodet. of II
2
3J
isof order2
Thus. although the 2 equations are independent and the number of variables is 2
(the necessary conditions), the sufficient conditions are not met.
Xl+2X2~1
X2~
xl+
2
2 x
~3
~2
X I
(b)
X,
~
XII)'
+
(x,
I)'
=
0
No; 2 solutions
.
The equations are independent
XI
XI +X,
=
I
I
I
,
I
\
r
I
Two solutions exist as can.be seen fTomthe plot hence no unique solution exists.
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Examine the row of C3Hs. None ofthe
concentrations are greater than the desired 50% so
50% is not achieveable by any combination of A, B, or C. Or look at the CH4 row.
7.12
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 Winter '08
 Herz
 Mass, 2J, 3 g

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