Heat exchanger network grid diagram

Figure B.l shows a pair of composite curves divided into vertical enthalpy intervals. Also shown in Fig. B.l is a heat exchanger network for one of the enthalpy intervals which will satisfy all the heating and cooling requirements. The network shown in Fig. B.l for the enthalpy interval is in grid diagram form. The network arrangement in Fig. B.l has been placed such that each match experiences the ATlm of the interval. The network also uses the minimum number of matches (S - 1). Such a network can be developed for any interval, providing each match within the interval (1) satisfies completely the enthalpy change of a strearh in the interval and (2) achieves the same ratio of CP values as exists between the composite curves (by stream splitting if necessary).

Figure 10.3 The Grid Diagram enables to develop the Heat Exchanger Network Appropriate Placement...

The design of the Heat Exchanger Network takes place in the balanced grid diagram. This means that the utilities have been placed on the Grand Composite Curve. As illustrated by the Fig. 10.3, the hot streams run from left to right at the top, and cold streams run counter-currently at the bottom. 

Consider the streams given in the Table 10.1. Develop the Heat Exchanger Network in a grid diagram for Minimum Energy Requirements. 

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