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5.16
a) From the isobutane thermodynamic properties figure in the problem, with the
condenser operating at 320 K, P
≈
0.675 MPa. Also,
()
kJ
ˆ
H leaving condenser
273
kg
∼
b) Isobutane entering the turbine is at 100 MPa and 480 K. From the figure,
kJ
kJ
ˆ
ˆ
H=775.6
and S=2.259
kg
kg K
⋅
. Also, isobutane leaving the turbine is at P = 0.675 MPa and
kJ
ˆ
S=775.6
kg K
⋅
, which corresponds to about 360 K and
kJ
ˆ
H=665
kg
.
c) From the energy balance, the work produced in the turbine is
in
in
out
in
dU
W
kJ
ˆˆ
0
M
H
H
W
so that
775.6
665
110.6
dt
kg
M
==
−
+
=
−
=
±±
±
Since 3 MW=3000 kW=3000 kJ/s the isobutane flow rate is
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This note was uploaded on 01/20/2012 for the course CHE 330 at USC.
 '08
 SHING

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