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182 Cha p te r E i g h t

exchange without compromising the quality of the scheduling
solution.

Example 8.4: Heat-Integrated Production Schedules
The recipes of products A, B, and C are shown in Table 8.5, and the corresponding
S-graph of the recipe is given in Figure 8.14. The parameters of the heat streams
are listed in Table 8.6. The available hot and cold utilities are 200°C and 10°C.
The heat transfer coefficient between a hot and a cold stream is 1500 W/m ∙ °C,
2
and the area of a heat exchanger unit is 3 m . 2
Product A Product B Product C
Task Eq. Time [h] Eq. Time [h] Eq. Time [h]
1 E1 5 E1 5 E1 6
E2 5 E2 5 E2 6
2 E3 4 E5 4 E5 3
E4 4 E6 4 E6 3
3 E5 4 E7 4 E7 4
E6 4 E8 4 E8 4
4 — — E1 5 — —
E2 5

TABLE 8.5 Recipes for the Products in Example 8.4

1 2 3
U1 5 U2 4 U3 4 31 A
4 5 6
32 A
U4 5 U5 4 U6 4
7 8 9
33 A
U7 5 U8 4 U9 4
10 11 12
U10 5 U11 4 U12 4 34 A
13 14 15 16 35
B
U13 5 U14 4 U15 4 U16 5 U2
17 18 19 20 36
B
U17 5 U18 4 U19 4 U20 5 U2
21 22 23 24 37
U21 5 U22 4 U23 4 U24 5 U2 B
25 26 27
38 C
U25 6 U26 3 U27 4
28 29 30
39 C
U28 6 U29 3 U30 4
FIGURE 8.14 S-graph of the recipe for the products in Example 8.4.