Page 157 - Process Equipment and Plant Design Principles and Practices by Subhabrata Ray Gargi Das

154 Chapter 5 Heat exchanger network analysis

Table P5.3C Hot section stream details.
Stream Type TS ( C) TT ( C) CP (kW/ C) DH (kW)

2 Cold 175 182 128.1 896.7
4 Cold 61 106 8.95 107.4
19 Cold 94 122 53.34 1493.52
14 a Cold 121 121 l ¼ 2268 kJ/kg 3780
3 Hot 156 104 8.28 430.56
13 Hot 175 104 22.3 1583.3
16 Hot 243 158 29.1 2473.5
P
N h ¼ 3; N c ¼ 4; Hence N h < N c is obeyed. At pinch, cold streams go in and hot streams go out CP h ¼ 59.68;
P P P
CP c ¼ 190.39; CP h CP c ;
a
Stream (1.667 kg/s) being vaporised.

Table P5.3D Cold section stream details.
Stream Type TS ( C) TT ( C) CP (kW/ C) DH (kW)

4 Cold 61 94 8.95 295.35
3 Hot 104 40 8.28 529.92
13 Hot 104 40 22.3 1427.2
P
N h ¼ 2; N c ¼ 1; Hence N h > N c is obeyed. At pinch, cold streams go in and hot streams go out CP h ¼ 30:58;
P P P
CP c ¼ 8:95; CP h CP c ;