HW3 Solutions

# HW3 Solutions - 6.5 Based on the process measurements there...

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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, ~ XI-I)' + (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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7.8 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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HW3 Solutions - 6.5 Based on the process measurements there...

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