Maximum energy recovery targets

In practice, the integer number of shells is evaluated from Eq. (7.18) for each side of the pinch. This maintains consistency between achieving maximum energy recovery and the corresponding minimum number of units target Nu- ixs- In summary, the number of shells target can be calculated from the basic stream data and an assumed value of Xp (or equivalently,... 

Figure 16.23a shows the complete design, achieving maximum energy recovery in one more unit than the target minimum due to the inability to tick off streams below the pinch. 

This is a very important target since it corresponds to the maximum energy recovery that can be attained in a feasible HEN for a fixed HRAT. This target allows for the elimination of several HEN structures which are not energy efficient and leads to near-optimal solutions as long as the energy is the dominant cost item compared to the investment cost. 

Given the stream data provided in Table 6.3, identify the energy targets and pinch temperatures. Design a HEN that achieves the maximum energy recovery. 

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