Page 297 - Design and Operation of Heat Exchangers and their Networks

Optimal design of heat exchanger networks 283

Example H3C2
This example is taken from Bjork and Westerlund (2002). The problem data
are listed in Table 6.19. The best network was obtained by Huang and
Karimi (2013) with the simultaneous synthesis approach based on the
stagewise hyperstructure. The network is shown in Fig. 6.19, which
contains one split and one bypass between the splitted streams. The
revised TAC of the network is 94,751$/yr.

Table 6.19 Problem data for H3C2 (Bjork and Westerlund, 2002).
2
_
Stream T in (°C) T out (°C) C (kW/K) α (kW/m K) Cost ($/kWyr)
H1 155 30 8 2
H2 80 40 15 2
H3 200 40 15 2
C1 20 160 20 2
C2 20 100 15 2
HU 220 220 2 120
CU 20 30 2 20
0.85 2
Heat exchanger cost¼6000+600A $/yr (A in m )
Total annual cost ($/yr)

Solutions in the literature Reported Revised
Huang and Karimi (2013) 94,742 94,751
Bjork and Westerlund (2002) 96,001 95,660
Huang et al. (2012) 95,643
Pava ˜o et al. (2016) 95,660
Bjork and Westerlund (2002) 100,720 100,691
Laukkanen et al. (2012) –

1000
155 30
H1
(8)
600
80 40
H2
(15)
1200 1200
200 40
H3
(15)
160 20
(20) C1
(1.366119)
(11.27517)
100 20
(15) C2
Fig. 6.19 Optimal solution for Example H3C2 (Huang and Karimi, 2013),
TAC¼94,751$/yr.