15-39
(c)
Above pinch
theory says
4 exchangers
but can try
“direct match”
HU
40
1
100
2
120
3
160
4
100
40 120 100
(d) Above pinch PCPH CmCm – here, the direct match works
Stream Number 1 2 3 4
CkWCm P 2 3 4 2
(e) Below pinch PCPH CmCm
Stream Number 1 2 3 4
CkWCm P 2 3 4 2
31
15-41
15.22
15-42
(d)
15-43
15.23 Using the heat transfer coefficients given, use the Sensitivity Plot feature of HENSAD to
generate the following data and plot
From Problem 15.22, the heat transfer area for the network is 2220 ft2
15-44
15.24
ho F
M
had
j
/ho had
j
BTU/hr/ft2 F Fig 15.16 BTU/hr/ft2 F
75 1.00 1.00 75.00
Using the adjusted heat transfer coefficients from the above table we get the following
results.
15-45
15.25
15-47
15.26
15-48
15-49
15.27
15-51
15.28
15-52
15-53
15.29
15-55